The Research of Intelligentized Synchronous Motor Excitation Controller

　　The Research of Intelligentized Synchronous Motor Excitation Controller
　　Under driving variability load conditions, synchronous motor excitated magnet by direct current has better efficiency than permanent magnet synchronous machine’s. Synchronous motor excitated magnet by direct current can make output mechanism specialities matched load specialities by means of adjusting exciting current to change magnetic field and power Ball Neodymium Magnets
http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php factor. Synchronous motor excitated magnet by direct current can work on the state of absent excitation current, normal excitation current and excessive excitation current. The state of synchronous motor’s power factor value equaling to 1 approximately and the reactive power being the least is the normal excitation state. So it is important that we design a set of stable and reliable excitation device of synchronous motor excitated magnet by direct current.Devising excitation device of synchronous motor with the characteristic of stable, reliable and having better effect of saving electrical energy is just my major task. Synchronous motor can sustain power factor closing to one and work at the state of excessive excitation current even if synchronous motor’s load is changed abruptly. Here, the effect of synchronous motor is the best. At first, finish system’s design of hardware circuit;
　　Then amend parameters and check design error by simulation soft EWB. Make PCB board with software protel DXP and weld electron component;At last, debug software programme and realize system’s function.A set of synchronous motor excitation device with the imbedded microcomputer PIC16F877 as the intelligentized control unit is presented in this paper. Single chip finish detection of input signal and http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php disposal of control arithmetic. Then it export pulse width modulation signal through RA2 to control IGBT’s on-off. Thus excitation current can be adjusted and closed loop control of power factor can be completed. Furthermore, this device has the functions of casting excitation current automatically, out-of-step protection, protection of absent excitation and excessive excitation and giving the alarm.Because this system has some characteristics of nonlinearity, time-variety and complexity, Common PID controller with three invariable parameters does not reach control command. So propose a new fuzzy controller based on neural network and make it applied this system. The control model is structured by SIMULINK module, and the simulation results show fuzzy neural network control is preferable to PID control and fuzzy control in respect of fast tracking performance and anti-jamming performance.