The Design of Large Thrust Permanent Magnet Linear Servo Motor and Driver

　　The Design of Large Thrust Permanent Magnet Linear Servo Motor and Driver
　　With the development of modern advanced numerical control(NC) machines,the performance of the linear servo feeding system is more and more important and the research of direct drive of permanent magnet linear servo motor(PMLSM) is meaningful. Based on Finite Element electromagnetic field theory,the reason of thrust ripple of large thrust PMLSM used in NC machines is analyzed and the electromagnetic field and thrust ripple of PMLSM is calculated.The electromagnetic design and mechanical design is based on calculation.TMS320LF2407A is used for designing the control system of PMLSM.The end and cogging effect are the main reasons for thrust ripple of PMLSM,the Samarium Cobalt Magnets end and cogging effect is serious for large thrust PMSLM,the thrust ripple is serious too.For reducing the thrust ripple of PMLSM,the paper uses the design method of permeance modulating,the primary of motor uses open slot,both cogging permance and ending permance are modulated,causing the synthesized wave proportionally distributing in odd numbers of permanent magnet pole.The method of permeance modulating is applied in the design of permanent magnet linear servo motor,and conflating the theory of fraction-slot, which can reduce the thrust ripple caused by the ending effect of PMLSM effectively.In addition,considering of the request of production process of PMLSM,according to http://www.chinamagnets.biz/Samarium%20Cobalt/Samarium-Cobalt-Magnets.php production characteristics of large thrust PMLSM,mechanical design of motor is designed.
　　The cooling system uses the water cooling system,simultaneously considering of mechanical processing very well.The winding of primary motor uses single tooth and concentrated molding coils,having short distance and distributive effect,also having the characteristic which is well craft,short ending of windings,highly density of thrust.Based on vector control theory,TMS320LF2407A is used for constructing control system model of PMLSM used in NC machines and PM30CSJ060 is used to drive PMLSM.The circuit of control system of PMLSM is quite perfect.Software frame of vector control system of PMLSM is formed;it provides the foundation of hardware and software for developing advanced control algorithm after.