无刷直流鱼雷推进电机控制器设计

无刷直流鱼雷推进电机控制器设计

 The thesis discusses the state-of-the-art of BLDCM and the pending further study of the main issue. The thesis discusses the key-technology about a control system project which applied to a large power capacity rare earth permanent magnet brushless DC motor (BLDCM), designs the hardware and software of the BLDCM control system.The thesis analyzes the causes of the torque ripple Neodymium Magnets

http://www.999magnet.com/products/110-sintered-neodymium-magnets BLDCM and the commutation current. Building the BLDCM model under the conditions of the magnetic circuit which is not saturated, eddy current and hysteresis loss which is not consider, the three-phase windings of the brushless DC motor which is completely symmetrical. Compare with the torque in non-commutation interval, analyzing the torque formula in different current slopes. Derivation different torque ripple in different current slopes. Combining the formula was derived and references, then bringing up the method which is based on the hysteresis current law to restrain torque ripple. Next, the method of regulating the speed of BLDCM is studied detailedly. On the basis of fuzzy control, Fuzzy controller regulate the speed with hysteresis current regulator bicyclic current regulation governing system PID controller and with the use of speed adjustment current hysteresis current regulator with the adjustment bicyclic systems in MATLAB simulation speed, proved its superiority in less torque ripple and less speed change; On the basis of the above, TMS320LF2407A control subsystem based on the complete hardware design: The clock module, memory modules, etc. According to the hardware design, the main program flow, speed adjustment, the current regulation, and commutation logic are completely designed by DSP. 更多还原

Design of High Precision Rate Servosystem with Regulable Dynamic Balance

Design of High Precision Rate Servosystem with Regulable Dynamic Balance

 Based on a certain high precision rate servosystem, the effects to the precision and smoothness induced with electromagnetic moment fluctuation of the motor and dynamic imbalance are emphasized and analyzed in this paper. The static performance of the system is improved neodymium prices

http://www.999magnet.com/products/142-neodymium-prices by dynamic balance modulation and controller design.Firstly, the mechanism model of permanent magnet synchronous motor with vector control is derived by completely decoupling; and so on the mathematics model of the plant. The nominal plant is given by the method of least squares in frequency domain. The principle of the motor moment fluctuation subjected to periodical disturbance in rate table servosystem is analyzed. The quantity and mathematic expression of the moment fluctuation are presented by experimention.Secondly, the method of dynamic balance is studied. The mechanism and project of the dynamic balance system are introduced as an essential element to the whole servosystem. Integrating with the configuration of the system, the arithmetic is given based on statics, meanwhile the method to due with the testing signal is discussed below. Then the dynamic balance of the system is regulated through designed mechanism.Finally, the repetitive control law is introduced to check the electromagnetic moment fluctuation subjected to its periodical characteristic. The Principle of the repetitive controller to reject the periodical disturbance and the stability of the repetitive system are analyzed in detail, meanwhile the method to choose the parameters of the system and the steps of tuning are given. The repetitive controller is used to the rate servosystem and the analytic and design results indicate that the method in this dissertation is feasible and effective. 更多还原

Design and Research on Traveling Gear of Preventing All-direction Turnover Vehicle

Design and Research on Traveling Gear of Preventing All-direction Turnover Vehicle

 This paper bases on the electric vehicle (EV) industrialstarting with the development, analysis the working conditions and the development tendency of Neodymium Magnets

http://www.999magnet.com/products/110-sintered-neodymium-magnets Firepower Sally Vehicle, Battlefield Reconnaissance Tank, small fire trucks ,and so on special environment vehicle.Then proposed the Preventing All-direction Turnover Vehicle(three crawler travelling gear of the special vehicle structure preventing turnover), has conducted the related fundamental research and the simulation design. In the paper, author design the structure of the overall vehicle,crawler travelling gear, preventing turnover Hydraulic Suspension, and so on.Carries on the preliminary design to the vehicles wheel hubmotor-driven system, and research on the vehicles dynamics characteristic.The author research on the mobile characteristic and dynamics characteristic of the crawler vehicles.In the analysis process, first, has studied the influence which the EV new structure that the paper designed has done,and the technical Improvement space of the new structure; Next, according to the above content, as well as the characteristic of crawler travelling gear, this paper to propose the project to solution of three group independent directly hubmotor-driven systems. This plan basis vehicles movement road surface difference, the design structure can guarantee the vehicles have the good power performance and the energy Reliability in each kind of road surface, especially in roadlessness pavement to operate the stability to be good.Designed the vehicles overall structure according to dynamics analysis result,walked the installment and the hydraulic suspension structure, and walked the installment to the design to carry on the animation simulation. Has determined the vehicles hybrider vehicle control strategy and the carrier vehicles arrangement according to the structure analysis.In the research dynamic system power match relations foundation,has determined dynamic system part and so on in part engine,generator, battery, wheel hub electrical machinery, hydraulic pump through the analysis computation power. Has laid the solid foundation for the next step of work.This article analyzed the permanent magnetism not to brush the direct current motor the objective parameter and with the actuation control strategy correlation characteristic description, in analyzed it basedon PIC, 51, series actuation system and so on DSP foundation,walked the installment according to the vehicles to use independently actuates the electrical machinery the characteristic, proposed special-purpose the dsPIC30F series chip which controlled to the electrical machinery controls this vehicles with Microchip Corporation to walk the installment actuation system. In the plan design,the implementation process,this article finally has all carried on thesimulation and the experimental confirmation to various links and the overall system,has confirmed the vehicles power design calculationdata and the electrical machinery test cell run data tallies. 更多还原

Study on the Technique of Magnetic Abrasive Finishing in Mould Surface

　　Study on the Technique of Magnetic Abrasive Finishing in Mould Surface
　　Recently, advanced technologies in manufacturing industry demand the production of much more precise and efficient parts. However, tradition machining involving a single process cannot satisfy the present demand for both quality and high efficiency simultaneously. The surface quality is determined by surface roughness and the tress state of the surface. The available traditional and advanced finishing processes alone are still incapable of producing desired surface characteristics on complex Block neodymium magnet geometries, and in exercising in-process control on finishing action. Thus, a magnetic abrasive finishing process would meet the demand represents the current trend in the field of manufacturing. The magnetic abrasive finishing (MAF) process has intrinsically superior finishing characteristics, especially of complex shapes. A mixture of the iron grain and aluminum oxide abrasive yielded a superior effect on the surface finish and material remove rate. Traditional fine finishing operations such as grinding, lapping, or honing employ a rigid tool that subjects the work piece to substantial normal stresses which may cause micro cracks resulting in reduced strength and reliability of the machined part.
　　A relatively new fine finishing method, magnetic abrasive finishing (MAF) is an advanced finishing method, the method was originally introduced in the Soviet Union, with further fundamental research in various countries including Japan. Nowadays, the study of the magnetic field assisted finishing processes is being conducted at industrial levels around the world.Magnetic abrasive finishing (MAF) is an advanced finishing process in which the cutting force is primarily controlled by the magnetic field. It minimizes the possibility of micro cracks on the surface of the work piece, particularly in hard brittle material, due to controlled low forces acting on abrasive particles. This process is able to produce surface roughness of nanometer range on flat surfaces as well as internal and external cylindrical surfaces. Via MAF, the initial surface roughness of 0.25μm Ra can be improved easily to 0.05μm Ra within a few minutes. And produces neither a deteriorated layer nor micro-cracks on the finished surface. The MAF process offers many advantages, such as self-sharpening, self-adaptability, controllability, and the finishing tools require neither compensation nor dressing. Magnetic abrasive finishing (MAF) is a processing technology using magnetic abrasive brush formed by magnetic abrasive grain (MAG) under magnetic field to finish surface of work piece. The surface is finished by the shearing of the peaks resulting in circular lays formed by the rotation of the FMAB. In magnetic abrasive finishing (MAF) process, magnetic force plays a dominant role in the formation of flexible magnetic abrasive brush (FMAB) and developing abrasive pressure. In order to produce the magnetic force, the magnetic fields used in MAF include permanent magnetic field and electromagnetic field.In the magnetic abrasive finishing (MAF) process, magnetic field is generated using an electromagnetic. Current in the ranges of 0-10A is passed through the copper coil wound in the form of a solenoid.
　　The magnetic field generated within the magnetic core passes through the magnetic head. Magnetic abrasive is introduced in the gap between the magnetic heads, i.e., between the N and the S poles. Due to the presence of the magnetic field, the abrasive align in the direction of the field and the magnetic powders will be arranged like brushes and the strength and stiffness of the magnetic brushes can be controlled by the electric current supplied. Shinmura et al. have studied basic principles of the MAF Ball Neodymium Magnets process and concluded that the stock removal and surface finish value (Ra) increase as the magnetic abrasive particle diameter“D”increases. In order to achieve smooth surface and remove surface damage, the ferromagnetic particle diameter mast be chosen as a compromise of material removal rate and resulting surface finishing. In the fifth chapter gets the optimal diameter“D”of the magnetic abrasive particle by the finishing tests. Kim et al. have modeled and simulated the MAF process and concluded that the magnetic flux density in the air-gap is affected greatly by the length of the air-gap; magnetic flux density increases as the air-gap length decreases. In addition to magnetic flux density, this paper has studied flat surface finishing of steel work piece and concluded that rotating speed of magnetic pole, magnetic abrasive mesh and finishing time etc are the parameters which significantly influence the change in surface finish value (Ra).Most of the previous research work has been focused on the finishing characteristics and mechanism from a macroscopic point of view using the surface roughness profiles as the measure. However, those approaches do not adequately characterize the behavior of abrasive cutting edges acting against the surface during the removal process. This paper examines the acting forces, magnetic field set, magnetic abrasive grains and experiments by which provides a fundamental understanding of the process characteristic about MAF.This paper makes theory and test data analyses about MAF as the discussing focus. The main contribution of this dissertation is briefly presented as follow:In chapter 2, this paper deals with the theoretical investigations of the MAF process about the magnetic force. To analyze the finishing process, a force transducer has been designed and fabricated to measure forces acting during MAF.A microcosmic model of the process is developed to analyze the mechanism of the material removal and forces on the work piece surface.
　　A theoretical model for material removal is also proposed accounting for micro cutting by considering a uniform surface profile without statistical distribution.In chapter 1,the dissertation introduces the background and the internal and overseas development survey of the research, the summarize about the technique of the MAF and application foreground of this research are discussed.In chapter 3, this dissertation discuss the design of the magnetic field set a copper coil, wound in the form of a solenoid, is used for the generation of the magnetic field in the core. the alloy of aluminum is used as the magnetic core material. Magnetic heads are designed such that the stronger magnetic field is concentrated surrounding the air gap with minimal leakage between the magnetic heads and the magnetic core.In chapter 4, this dissertation analyzed grinding mechanism and effect of magnetic abrasive grain in the magnetic abrasive finishing. Magnetic abrasives grains (MAG) were abrasive tool of magnetic abrasive technique. Some preparation technique of MAG is introduced. Blinding and sinter techniques are emphasesly introduced. In some situations, it is proved that magnetic abrasive grains are produced by blinding technique can replace the magnetic abrasive grains are produced by sinter technique by experiments in this study.In chapter 5, the test analyzing of MAF. There are many main effect factors on MAF, such as Magnetic Flux Density, Rotating Speed of Tool Magnetic Pole, Grain Diameter of Magnetic Abrasive, neodymium prices Finishing Time, Working Gap and Feed Speed of Machine and so on. Based on a series of experiments, to get the effect law of the diverse factors on finishing quality and efficiency, this dissertation explore and study these factors which have important contribution on the finishing quality. Process parameters were provided to the popularization and application of MAF technology.In chapter 6,the conclusion and expectation.

真空熔体快淬+HDDR方法制备各向异性Nd-Dy-Fe-Co-Zr-B合金磁性能研究

　　真空熔体快淬+HDDR方法制备各向异性Nd-Dy-Fe-Co-Zr-B合金磁性能研究
　　The anisotropic permanent magnetic alloys were prepared by melt-spun + HDDR method. The magnetic properties of the samples were measured by Vibrating Sample Magnetometer (VSM). The phases of the samples were studied using X-Ray diffraction (XRD). The particle size distribution and the morphology of the samples were observed by Transmission Electron Microscopic (TEM).The melt-spun ribbons with normal composition of Nd12.7Dy0.3Fe64.9Co16Zr0.1B6 were prepared at surface velocity 8m/s. In order to study the effect of HDDR condition on the magnetic properties of the samples, the Neodymium Magnets melt-spun ribbons were treated at different hydrogen pressure and different temperature during HD process, at different temperature and different times during DR process. The influence of Co content on the magnetic properties of Nd12Dy1Fe80.9-xCoxZr0.1B6 alloy was also studied in this thesis. The main results are as follows:(1) During HD process, the melt spun ribbon absorbed hydrogen and decomposed into NdH2, (Fe, Co)2B,α-(Fe, Co) and some undecomposed 2:14:1 phase. Those undecomposed 2:14:1 phase could be the nucleation centre during DR process while the decomposed mixture formed c-axis texture of Nd2(Fe, Co)14B. After HDDR process, the original flaky crystal has been destroyed and the fine spherical particles were obtained.(2) The magnetic properties of the samples were enhanced greatly after HDDR process due to the improvement of the microstructure and the increase of the grain orientation of the samples. The best magnetic properties of (BH)max=21.170 MGOe, Br = 1.090T , Hci = 748kA/m for Nd12.7Dy0.3Fe64.9Co16Zr0.1B6 sample were obtained under the following HDDR process: The melt-spun Nd12.7Dy0.3Fe64.9Co16B6Zr0.1 ribbon was heated up to 800℃in vacuum.
　　Then the sample subjected to HD process for 120 minute under the hydrogen pressure of 0.05MPa. After that, keep the sample in the 0.03MPa argon environment at this temperature for 30 minute. neodymium prices Finally, keep the sample at the same temperature in the vacuum for 30 minutes and then furnace cooled.(3) The magnetic properties of melt-spun+ HDDR treated Nd12Dy1Fe80.9-xCoxZr0.1B6 sample were studied. The experimental results showed that the energy product, the remanence and the coercive force of the sample can be improved simultaneously by substitute Fe element by moderate Co. In addition, the Curie temperature of the sample enhanced greatly by substitute Fe element by moderate Co.

Research of Speed Regulate System of Three Phase BLDCM Based on DSP

　　Research of Speed Regulate System of Three Phase BLDCM Based on DSP
　　The structure of BLDCM is similar to traditional DC motor,At the same time, it has the advantages of high efficiency and easily adjusting speed of AC motor. It has been widely used.On the basis of the summary for the development and application of permanent magnet brushless magnetic materials DC motor speed-variable system, this thesis introduces a control system, which uses DSP to control the commutation and speed of BLDCM. The basic structure, operational principle and design method of this system are set forth in this thesis. The thought of hardware design and software programming is introduced as well. At last, the experimental results are presented.In the end, I simulate the BLDCM using Matlab/simulink software which proved that the control system works well as it was expected.

Research on Simulation of Matching Limited-Slip Torque of ELSD with Vehicle Performance

　　Research on Simulation of Matching Limited-Slip Torque of ELSD with Vehicle Performance
　　In the wake of the development and application of new techniques, some kinds of vehicle applied control systems come forth to improve one or more kinds of performance of vehicle, such as Anti-lock Braking System(ABS), Cruise Control System(CCS), Vehicle Stable System(VS) and Anti-Slip Regulation System(ASR). ASR is the most famous among of all those control systems. For the capability of improving the steering stability and driving performance of vehicle obviously, decreasing the tyre abrasion and the neodymium standard state possibility of accident, as well as enhancing the security of the vehicle, ASR is applied widely and rapidly abroad, and paid extensive attention in our country.The main controlling modes of ASR include: regulating output torque of the engine, regulating braking torque of driving wheels, and regulating clutch or transmission and regulating differential. Among which, regulating differential is the most important mode of all. According to the regulating differential, obtained drive torque from both drive wheels can keep changing with the control instruction and road condition. When the accreting quotiety(μ)contrasts distinctly and the lowμside occurs slip rotating,the drive accreting power of highμside drive wheel can exert sufficiently, as a result, the vehicle drive power and steering stability will improve in certain degree.Electronically controlled limited slip differential (ELSD) is an active control system which works to regulate and control limited-slip performance automatically by means of electronically controlled technique. According to the condition of vehicle driving and road, ELSD can modulate its limited-slip performance by restraining excessive slip of driving wheel and redistribute drive torque between driving wheels.
　　Therefore, ELSD can fully exploit the available traction force from the road adhesion and effective improve the traction, stability, controllability, drivability and safety. ELSD is the efficient method of Torque Manage technique of Differential (TMD).The whole thesis is supported by the science development project of Jilin Province science and technology committee“Research and Development of Electronically-controlled Limited Slip Differential”. On the basis of the latest advancement of ELSD research at home and abroad, the theoretical research and development about motor-drive-type ELSD is studied. In this paper, the main research content contains:1. Study on the structure of ELSDControl system and executive system as the two main constitute of ELSD are studied in detail.Control system mainly consists of sensor, electronic unit, micro motor, speed reducer and actuating mechanism. Magneto electric speed sensor, 55LY53 type permanent-magnet direct current toque motor, harmonic reducer and cylindrical gear reducer are employed in the control system. Actuating mechanism is designed to pass axial packing force to executive system via geared sector, ball and float sleeve. Control system serves to adjust limited-slip performance of ELSD. Executive system is composed of two sections such as differential mechanism and limited-slip mechanism. Differential mechanism is to make sure the difference between half-axle by planetary gear mechanism. Limited-slip mechanism change axial packing force into limited-slip moment and realize the limited-slip performance of ELSD.The structure research and working process of ELSD are also the foundation of the design and application of ELSD.2. Study on self-adjusting control algorithm for ELSD
　　The control object of ELSD used to limit the excessive slip of the low-adhesion-side driving wheel and dynamically regulate its limited-slip performance is put forward and control strategy is constituted. Current control is adopted to adjust output torque of torque motor.To carry out its control object and control strategy, some control technique of ELSD are discussed. Firstly the application on PID control algorithm is studied. In order to improve its control effect and its robust ability, fuzzy PID self-setting control algorithm is finally chosen. Fuzzy control table is made by the off-line indirect method.The research on control algorithm of ELSD is also the foundation of the theory and application to actualize limited-slip performance.3. The model of vehicle four-wheel dynamic Based on vehicle parameter of a RWD vehicle, the four-wheel dynamic model is set up by modeling of engine, transmission, main reducer, ELSD and tyre mathematical model. And the mathematical model is also the foundation of the match between limited-slip torque of ELSD and vehicle performance.4. Study on simulation and analysis Based on the mathematical model, the simulation model is made by MATLAB/SIMULINK. The power performance and handling quality and stability of vehicle with ELSD is studied, on the construction of the simulation model.The simulation results show that: ELSD can improve on power performance. It decrease accelerating time and increase maximum grade ability on the split-μroad. It can enhance under steer and improve stability. When steady-state cornering, it augment ratio of cornering radius and difference of side-slip angles between front axle and rear axle. When slalom running, it reduce average yaw angular velocity and average side acceleration. ELSD slightly reduce the controllability. It aggrandizes average steering angle and steering torque.

Research on Simulation of Matching Limited-Slip Torque of ELSD with Vehicle Performance

　　Research on Simulation of Matching Limited-Slip Torque of ELSD with Vehicle Performance
　　In the wake of the development and application of new techniques, some kinds of vehicle applied control systems come forth to improve one or more kinds of performance of vehicle, such as Anti-lock Braking System(ABS), Cruise Control System(CCS), Vehicle Stable System(VS) and Anti-Slip Regulation System(ASR). ASR is the most famous among of all those control systems. For the capability of improving the steering stability and driving performance of vehicle obviously, decreasing the tyre abrasion and the neodymium standard state possibility of accident, as well as enhancing the security of the vehicle, ASR is applied widely and rapidly abroad, and paid extensive attention in our country.The main controlling modes of ASR include: regulating output torque of the engine, regulating braking torque of driving wheels, and regulating clutch or transmission and regulating differential. Among which, regulating differential is the most important mode of all. According to the regulating differential, obtained drive torque from both drive wheels can keep changing with the control instruction and road condition. When the accreting quotiety(μ)contrasts distinctly and the lowμside occurs slip rotating,the drive accreting power of highμside drive wheel can exert sufficiently, as a result, the vehicle drive power and steering stability will improve in certain degree.Electronically controlled limited slip differential (ELSD) is an active control system which works to regulate and control limited-slip performance automatically by means of electronically controlled technique. According to the condition of vehicle driving and road, ELSD can modulate its limited-slip performance by restraining excessive slip of driving wheel and redistribute drive torque between driving wheels.
　　Therefore, ELSD can fully exploit the available traction force from the road adhesion and effective improve the traction, stability, controllability, drivability and safety. ELSD is the efficient method of Torque Manage technique of Differential (TMD).The whole thesis is supported by the science development project of Jilin Province science and technology committee“Research and Development of Electronically-controlled Limited Slip Differential”. On the basis of the latest advancement of ELSD research at home and abroad, the theoretical research and development about motor-drive-type ELSD is studied. In this paper, the main research content contains:1. Study on the structure of ELSDControl system and executive system as the two main constitute of ELSD are studied in detail.Control system mainly consists of sensor, electronic unit, micro motor, speed reducer and actuating mechanism. Magneto electric speed sensor, 55LY53 type permanent-magnet direct current toque motor, harmonic reducer and cylindrical gear reducer are employed http://www.999magnet.com/products/112-neodymium-standard-state in the control system. Actuating mechanism is designed to pass axial packing force to executive system via geared sector, ball and float sleeve. Control system serves to adjust limited-slip performance of ELSD. Executive system is composed of two sections such as differential mechanism and limited-slip mechanism. Differential mechanism is to make sure the difference between half-axle by planetary gear mechanism. Limited-slip mechanism change axial packing force into limited-slip moment and realize the limited-slip performance of ELSD.The structure research and working process of ELSD are also the foundation of the design and application of ELSD.2. Study on self-adjusting control algorithm for ELSD
　　The control object of ELSD used to limit the excessive slip of the low-adhesion-side driving wheel and dynamically regulate its limited-slip performance is put forward and control strategy is constituted. Current control is adopted to adjust output torque of torque motor.To carry out its control object and control strategy, some control technique of ELSD are discussed. Firstly the application on PID control algorithm is studied. In order to improve its control effect and its robust ability, fuzzy PID self-setting control algorithm is finally chosen. Fuzzy control table is made by the off-line indirect method.The research on control algorithm of ELSD is also the foundation of the theory and application to actualize limited-slip performance.3. The model of vehicle four-wheel dynamic Based on vehicle parameter of a RWD vehicle, the four-wheel dynamic model is set up by modeling of engine, transmission, main reducer, ELSD and tyre mathematical model. And the mathematical model is also the foundation of the match between limited-slip torque of ELSD and vehicle performance.4. Study on simulation and analysis Based on the mathematical model, the simulation model is made by MATLAB/SIMULINK. The power performance and handling quality and stability of vehicle with ELSD is studied, on the construction of the simulation model.The simulation results show that: ELSD can improve on power performance. It decrease accelerating time and increase maximum grade ability on the split-μroad. It can enhance under steer and improve stability. When steady-state cornering, it augment ratio of cornering radius and difference of side-slip angles between front axle and rear axle. When slalom running, it reduce average yaw angular velocity and average side acceleration. ELSD slightly reduce the controllability. It aggrandizes average steering angle and steering torque.

Study on Matching Optimized Technique in AMT System of Off-road Vehicle

　　Study on Matching Optimized Technique in AMT System of Off-road Vehicle
　　Matching Optimized Technique in AMT System of Off-road Vehicle is studied through the topic.The purpose is to realize the matching optimized between AMT and power transmission system of Off-road Vehicle. Consequently, it improves power performance and economy performance of Off-road Vehicle in all sorts of roads. the whole article includes four chapters.The first chapter is prolegomenon. the first of all, it magnetic materials summarizes the structure, work theory and development of AMT System, and analyzes the present status and development of domestic cross-country, points out that safety, environmental protection], comfort, economy of Off-road in lower level, in succession, puts forward the research method on the article. And analyzes the development status about power transmission in home and broad .in the end, it points out the research method and mostly content with the topic.The second chapter is to introduce power transmission of Off-road vehicle. The chapter is made detailed analysis to power transmission of Off-road vehicle. It is to match primary performance of AMT System of Off-road Vehicle in the following chapter.There are three parts in the dissertation. In the first part, it is studied experiment to electric ejecting gasoline engine performance of Off-road vehicle, through experiment, it is obtained velocity performance of engine, and acquired all performance curve of engine through calculation. thus it is more instructing significance to establish shift law http://www.999magnet.com and realize engine control. in the second, it is to study clutch diaphragm spring performance equipped with Off-road Vehicle by the numbers, such as burthen performance, torque transferring performance, abrasion performance and etc. it is studied to abruption performance , engagementperformance and abrasion performance of clutch through experiment. and obtained torque transferring performance of clutch by calculation. it is brief introduced to Self–Adjusting Clutch (SAC). Compare to the conventional clutch, the SAC has some advantage. it is used to replace the diaphragm spring, reduce the actuation force and lower the clutch size. so it is the group of constituting clutch control regulation and control strategy in AMT exploitation. Finally ,the feature of the transmission is simply illuminated through manipulating performance experiment. Its result is considered as radical parameters to study the perform institute.The third chapter is to analyze matching technique in AMT system of Off-road vehicle. Concept of coupling and matching for product design was expounded.
　　Basic matching contents of vehicle power transmission system that include four type of matching of structure configuration , performance , control and strength rigidity were put forward. Finally, it is studied the matching technique of perform institute and control system in AMT system.In the first, matching the perform institute in AMT system is made up of Matching hydraulic perform institute and throttle perform institute. hydraulic perform institute is constituted with select-exchange perform institute and clutch perform institute. The structure of hydraulic perform institute is optimized by matching it’s structure dimension and flow. in the second, it is to match throttle perform institute. Choose 86BYG450B-01 of permanent-magnet stepper motor by motor’s work requirement.The control system in AMT system is made up of shift synthesis control, shift law and throttle control. First of all, it is to match shift synthesis control, it is obtained the variation rule of diaphragm spring’s torque transferring performance by the http://www.999magnet.com start-shift process and engine control process of Off-road. and establish clutch control system. Secondly, it is to match shift law. Analyzing optimal shift point of Off-road vehicle, considering the influence factors of shift law, and applying dynamic three parameters to shift law. Thirdly, it is to match throttle control system. Realize throttle self-control by controlling the size of stepper motor throttle. Finally, it is to establish the synthesis control strategy in AMT system.The fourth chapter is to test research on AMT system performance. it is to test the basic performance of start-shift, acceleration and etc, pass capacity and climbing capacity in AMT sample vehicle by Visual scope . Experiment result as following:(1)in the course of start experiment, apply proper matching to clutch control and throttle control, start smoothly and rapidly.(2)in the course of shift experiment, shift time is lower, engagement clutch is smoother, shift quality is better.(3)in the course of acceleration experiment, shift time is lower, acceleration performance is better.(4)in the course of climbing and road experiment, automotive of Off-road vehicle is better.Accordingly, it is to make conclusion that the dynamic and automotive of Off-road vehicle is improved greatly.

Design activities on helical DEMO reactor FFHR-d1

　　Design activities on helical DEMO reactor FFHR-d1
　　A. Sagara , T. Goto , J. Miyazawa , N. Yanagi , T. Tanaka , H. Tamura , R. Sakamoto , M. Tanaka , K. Tsumori , O. Mitarai , S. Imagawa , T. Muroga
　　National Institute for Fusion Science , Toki , Gifu 509-5292 , Japan , Tokai University , 9-1-1 Toroku , Kumamoto 862-8652 , Japan
　　Highlights Conceptual design studies neodymium prices
http://www.999magnet.com/products/142-neodymium-prices of the helical DEMO reactor FFHR-d1 have been conducted. Design window analyses with core plasma and engineering designs have been carried out. R&Ds on blanket, magnet, tritium control, fuelling and heating systems are discussed.;;Abstract Based on high-density and high-temperature plasma experiments in the large helical device (LHD), conceptual design studies of the LHD-type helical DEMO reactor FFHR-d1 have been conducted by integrating wide-ranged R& ...D activities on core plasmas and reactor technologies through cooperative researches under the fusion engineering research project, which has been launched newly in NIFS. Current activities for the FFHR-d1 in this project are presented on design window analyses with designs on core plasma, neutronics for liquid blankets, continuous helical magnets, pellet fueling, tritium systems and plasma heating devices.

Study on Compact BLADCM System and Its Structure Optimization

　　Study on Compact BLADCM System and Its Structure Optimization
　　Permanent magnet BLDCM has extensive applications in all kinds of precise control fields due to its excellent performances. A series of good qualities of compact BLDCM are proved by the contrast analysis of design and result of experiment, such as small size, compact structure and high efficiency, which accords with the development tendency of neodymium standard state saving energy.A compact motor with its control system is studied in this thesis. Firstly, a CAD software for BLDCM and compact BLDCM of small power is developed by VisualBasic6.0 in the need of the project. The software is of powerful picture aid and easy-going feature.The special structures of compact motor are studied and optimized by analyzing the performance and assemble method. Cogging torque is studied by theory analysis and Finite Element Analysis(FEA). Some methods are proved useful for reducing the cogging http://www.999magnet.com/products/112-neodymium-standard-state torque.A control and drive system of the compact motor is also designed with a control and drive CMOS chip UCC3626 which can hold the control of enable, direction and Speed control. Current limit circuit, separate circuit and buffer circuit are also designed. The sample motor is tested with experiment with the Magtrol automatic motor test system.It is proved that the compact BLDCM is better than those ordinary structure BLDC motors because of lots advantages, such as compact structure, high efficiency, high power density, small cogging torque and excellent control characterstic. So there is a wide space of application for compact motor.

Research & Design on MCU of Frequency-Variable Air-Condition with Brushless DC Motor

　　Research & Design on MCU of Frequency-Variable Air-Condition with Brushless DC Motor
　　Temperature control system of traditional air-condition depends on its sensors to monitor indoor temperature’s changes and to control the compressor to run at a specified speed. The compressor can’t adjust its running situation at an appropriate speed according to indoor temperature changes, which will result in dweller’s comfortableness and energy waste. In recent years, frequency-variable air-condition has the intelligence character that temperature is adjusted automatically, continuously, magnetic materials according to temperature’s change indoors. All this will avoid frequent switches of the compressor and economize energy.Brushless
　　DC motor (BLDC) with permanent magnet excitation, in which electrical commutation is used instead of mechanical, has the same good characteristics of speed control as traditional DC motor. Brushless DC motors have found wide application due to their high power density and ease of control. Moreover, the machines have high efficiency over wide speed range. Attachment of sensorless control not only overcomes a lot of disadvantages generated by the sensor, but also expands the application range of brushless DC motor further. At present, the research on Frequency-Variable Air-condition with sensorless brushless DC motors has become a development trend of control technique for frequency-variable air-condition.Depending on the Research and development of all DC frequency-variable air-condition, this dissertation http://www.999magnet.com researches and discusses the design of the microcomputer controller of DC frequency-variable air-condition’s outdoor machine. The specific work needed to do is as follows:(1) Give the introduction in detail for isolation between light current area and heavy current area, and bring forward a hardware design of power supply.(2) Application and improvement of the zero back EMF sensing and commutation point sensing respectively are advanced for sensorless brushless DC motors control in frequency-variable air-condition, while the control method of sensorless brushless DC motors based on MCU ST7MC1 is discussed in this dissertation.(3) Utilize fuzzy algorithm to optimize control air- conditioner’s compressor and electronic expansion valve.Now, the design and test of project have been completed. It has good capability of temperatures modulation, energy conseration, protect function and run security.

Organic Silane Modification and Functionalization Research of Fe3O4 Nanoparticles

　　Organic Silane Modification and Functionalization Research of Fe3O4 Nanoparticles
　　The water-solubility and stability of the Fe3O4 nanoparticles have been improved by the surface modification using organic silane. The particles are magnetic-fluorescent composite by encapsulating the fluorescence molecules in the coated SiO2. We also establish modal for the targeted magnetic nanoprobes through conjugating bovine serum albumin (BSA) on the neodymium prices composite particles.The magnetic nanoparticles are covered by the SiO2 produced by tetraethyl orthosilicate (TEOS), which is easily hydrolyzed in the water. After modification, the particles are regular globe, the aggregation of Fe3O4 nanoparticles is decreased, and the particle size can be preliminarily controlled by the adding quantities of TEOS. After choosing the parameters which create proper size and better morphology, the size and uniformity are controlled further. By employing a dropwise addition method, a more uniform and stable system is produced and particle size can be well controlled, then centrifugation and permanent magnet separation are used to remove the biggest and smallest particles. And then particles having narrower distributions and more regular shapes could be obtained.
　　The X-ray diffraction shows that surface modification has no effect on the structure of Fe3O4 nanoparticles. Intensive absorption band of Si-O appears on the Fourier Transform Infrared spectroscopy (FTIR). Isoelectric point and magnetic properties tests indicate that it is possible for the modified particles to stay stable at the PH comparative with the human body; and exhibit superparamagnetic characteristics http://www.999magnet.com/products/142-neodymium-prices with no remanence and coercivity, but the magnetization saturation decreases and the magnetic curves decline just because of the coated SiO2.The fluorescein isothiocyanate (FITC) is composited with 3-aminopropyl-triethoxysilane(APS) as precursors, then the precursors hydrolyse and coat the Fe3O4 cores together with the TEOS. The particles are magnetic-fluorescent composite, and amidocyanogen is introduced onto the particle surface, and then conjugate the BSA molecules. The fluorescence spectra shows that with the increase of the encapsulating fluorescence molecules, the intensity of

The Synthesis and Characterization of Red Lead, Bi2O3 and Cobalt Nanomaterials

　　The Synthesis and Characterization of Red Lead, Bi2O3 and Cobalt Nanomaterials
　　Red lead (Pb3O4), also known as minimum, trileadtetroxide or leadorthoplumbate, is normally a fine, dry, brilliant red colored compound usuallyused in the form of a powder which occurs naturally as the mineral minium. Incontrast to other lead oxides, the lead atoms in red lead occur in two differentoxidation states, i.e. Pb(II) and Pb(IV). Together with oxygen, they are arrangedin a tetragonal/pseudo-Brookite type of ionic lattice. Pb3O4 was historically usedas paint and the word miniature for illustrations in old manuscripts is derivedfrom minium. More recently, Pb3O4 has been used in batteries and ceramics andwas also Neodymium Magnets widely used in corrosion resistant oil based paints. Currently, becauseof limited studies on Pb3O4 nanostructures and its subsequent applications innanoscale electronic devices, investigations on the size-dependent properties oflead oxides are significantly delayed.In this article, two different methods were introduced, one was materialoxidation in furnace, and the other was oxidation in aqueous solution. In the firstapproach, red lead is produced in calcining furnaces in which the raw material isagitated while being heated at the optimum temperature for oxidation to therequired product. The temperature is held at a range of 450 to 500℃.
　　Then wereport on a convenient and controllable approach for the synthesis of red lead. Ina typical synthesis, the oxidant of hydrogen peroxide (H2O2) reacts with leadacetic (Pb (AC)2) in alkaline environment and the resulting products on theorder of 20~30nm can be obtained. Because of its simple technique, shortreaction procedure and a series of lead oxides can be made respectively bycontrol of oxidant, the method will http://www.999magnet.com/products/110-sintered-neodymium-magnets be valuable in preparation of nanometer leadoxide. We believe that there will be a new evolution in lead oxide industryaccompanied by progress in synthesis.From the standpoint of applications, due to its complicated structure andrelated properties, Bi2O3 is recognized as one of the most promising materialswhich can be used as a solid electrolyte in a variety of fuel cells, sensors, andmembranes, devices which utilize the unusually high oxygen ionic conductivityof this compound.
　　For many attractive properties and wide usage, thesynthesis of Bi2O3 especially Bi2O3 powders in nanoscale has been an importanttopic, and more and more approaches were used to product Bi2O3 powders. Here,we improved conventional deposition method, detracting the step for calcining.And the influences of the starting materials, mineralizers, reaction temperatureand time on the size of Bi2O3 are studied.Numerous physical and chemical methods have been employed to producemetal nanocrystals (NCs), including sputtering, metal evaporation, grinding,electrodeposition, solution phase metal salt reduction, and neutralorganometallic precursor decomposition. Small magnetic particles are ofimmense technological importance because of their use in magnetic recordingmedia and in the construction of permanent magnets. Several synthetictechniques have been applied to http://www.999magnet.com/products/110-sintered-neodymium-magnets synthesize magnetic metal (Fe and Co)nanoparticles, including thermal and sonachemical decomposition oforganometallic precursors, high-temperature reduction of metal salts, andreduction with reverse micelles. In this article, we showed a relatively simpleapproach for controlling the synthesis of cobalt nanocrystals. In aqueoussolution adding appropriate surfactant and legend, chloride cobalt was reduced tocobalt nanoparticles (25nm) by hydrazine at ambient conditions. In contrast toorganic and other methods, this approach is environment friendly and limitationof energy consume.

Effects of Element Co-Addition on the Microstructure and the Magnetic

　　Effects of Element Co-Addition on the Microstructure and the Magnetic Properties of (Nd, Dy)2(Fe, Cu, Co, Nb)14B/α-Fe Magnets
　　(Nd10.76Dy1)(Fe73.56-xCu0.8Co8Nbx)B5.88/α-Fe(x=0, 0.5, 1.0, 1.5)double phase nano-composite exchange-coupling hard magnet is a new candidate for permanent magnetic material. It is composed of Block neodymium magnet the hard magnetic phase (Nd,Dy)2(Fe,Cu,Co,Nb)14B and the soft magnetic phase a-Fe in their nano scale to make the nano-composite exchange-coupling effect comes to work. In this paper, the preparation of (Nd,Dy)2(Fe,Cu,Co,Nb)14B/a-Fe is systematically studied. The influence of Nb to the crystallization process and its magnetic properties are discussed.During the preparation of the master alloy, the current and melting time are studied. According to the SEM and XRD test of the alloy with different compositions, the stable http://www.chinamagnets.biz/Neodymium/Block-neodymium-magnet.php parameters for master alloy melting are given.According to the XRD analysis it is found all the four kind of alloys have excellent amorphous forming ability. It is also found that with the increase of the content of Nb, the temperature of (Nd10.76Dy1)(Fe73.56-xCu0.8Co8Nbx)B5.88 (x=0, 0.5, 1.0, 1.5) for crystallization is increased.(Nd10.76Dy1)(Fe72.56-xCu0.8Co8Nb1.0)B5.88/α-Fe has the best comprehensive magnetic properties with Hci=6656.3Oe, Mr =62.559emu/g and Ms=103.07emu/g.

The Research of Wind Rotor、Generator and Load Resistance Matching

　　The Research of Wind Rotor、Generator and Load Resistance Matching
　　In order to realize the wind power generation system maximum output power, proposed the load control wind rotor and the generator move when maximum power track match technology measure. Between the wind power generation system’s two major components wind wheel and the generator match technology, is the small wind power generation essential core technology. Two matches’effects directly affect the use factor of wind, and it’s Neodymium Magnets also affect the overall system performance characteristic, the efficiency and the year power rate. Therefore, the wind electricity system high efficiency is the wind power generation technology research keyThis article researches the output performance with the biggest C p in different wind speed, and established mathematical model based on the Wilson method Based on the Wilson method design rotate speed and the wind speed n = f(V)、the torque and the wind speed M = f(V) and has established the torque and rotational speed characteristic M = f(n), as well as the entire machine load resistance value and the wind speed functional relation RL = f(V); Using the proposed wind rotor pattern to make a theoretical analysis about the input of he voltage and current, which get from the wind power system of the rare earth permanent magnetism alternator generation under the different rotational speed, Finally, this article confirms the theory by the experimental method.
　　This topic independently designs http://www.999magnet.com/products/110-sintered-neodymium-magnets the 200W small wind turbine. With the measure of load control power output match technology, namely adjust the wind power by the changes of the load. When the wind-driven generator runs, the change is caused by the imbalance between the out put of wind power machine and the input of load, and the effect of load control is adjusting load according to the changing rules of rotor, and using the changed load to absorbs the changed delivered power, and balanced the output and input again. Finally, we will get the biggest C P, and increased the operation efficiency. This topic carried the experiment with the vehicle to conduct the comparison research, the theoretical calculation result and the experimental result basically tallies, which will give a reference to the biggest power of small wind power machine.