The Lift Variable Frequency Drive System Design Based On PMSM

Permanent magnet synchronous motor（PMSM）has the excellence of compact structure,light weight, high power density, no rotor heats and simple control compared with theinduction motor. Digital control can assure that the whole system obtain high precision andreliability and strong anti-interference ability. So the speed controlsystem of permanentmagnet synchronous motor is becoming the direction of AC variale speed system day by day.What’s more, the appearance of high-performance microprocessor DSP and the developmentof high capacity power electronics create the advantage for the digital control of PMSM.This project research the lift machine which is a special PMSM, the inside stator androtor structure is the same as general PMSM, so its control strategy has no any difference. Theapplication fields of PMSM lift machine is elevator, so the demand to the control system tendto low speed with high torque, higher speed response and trackable.This projiect aims atresearching a lift variable frequency drive system based on PMSM lift machine, makingsystem satisfy the need of elevator working.This paper first introduce lift machine’s development history and characteristic, illustratethe development tendency of PMSM drive system simply. Then deduce the motor controlstrategy---vector control technique which this system make use of. On account of coordinatetransformation, we obtain the mathematical model of PMSM and come up with vector controltechnique according to the rotor field. The third and fourth chapter introduce the system’shardware snd software platform, the software is based on the TMS320F28035DSP, Theplatform all adopt the method of modularization design, so the function of system is veryclear and understandable. At lat, we debug the system and conduct the experiment on elevatorbased on hardware and software platform, the experiment result indicate that the drivingsystem can satisfy the need of elevator, the system have comfortable running characteristic.