Research On Multi-module Permanent Magnet Synchronous Motor And Its Control System

High power motor and its AC electric drive system play a very important role in the field of industrial production.In view of the problems existing in the installation,manufacture,transportation and maintenance of the low speed and high power motor,a kind of multi-module permanent magnet synchronous motor system with special structure is designed in this thesis.In particular,the structure and performance of the motor ontology are studied,and the whole control system is designed with this kind of motor as the study subject.Furthermore,the simulation model of the system is set up and studied in the hybrid simulation environment.Firstly,this thesis summarizes the research background and significance of multi-module permanent magnet motor,and proposes the special structure of this motor,especially in terms of stator,rotor and winding.Then,the connection mode of power supply between multiple modules and the structure of the terminal block are designed.Next,the whole design flow and the splitting and restructuring principle of the multi-module permanent magnet motor is presented and analyzed.Besides,the mathematical model of this motor is proposed from two directions of the rotary motor and the linear motor.Secondly,aiming at the special characteristics of this multi-module permanent magnet motor,three different winding splitting methods are proposed.Through concrete examples,the method of adopting unequal span,changing slot number and using simple breaking is set out.Based on the concept of the parent module and the sub module,the problem existing in the asymmetry of three-phase winding is solved by using the method of exchanging the winding connection in the parent module.Meanwhile,the magnetic field and force in the side of the adjacent cell are studied.A prototype is designed to simulate and verify the simulation results.Thirdly,the structural frame of the control system in the multi-module permanent magnet motor is designed.Each modular motor in the current control and estimation unit uses the pulse vibration high frequency signal injection method to realize the motor speed sensorless detection.By using the modules of signal injection,signal processing,special position estimation and the judgement of the d-axis direction,the system realizes the initial position detection of this multi-module motor.Furthermore,the cooperative controller based on the theory of PID and deviation coupling theory is designed to obtain the output control quantity and realize speed synchronization of different modular motors.Finally,the simulation model of the motor body,the main circuit and the control algorithm of the system are built in the hybrid simulation environment of Ansys Maxwell,Ansys Simplorer and Matlab/Simulink,and the interface of the joint simulation is set up.Bystudying the running performance of the whole system under the mixed simulation environment composed of three softwares,the system is proved to be suitable for low speed and high power applications.This thesis has a certain reference value for the following study.