Research On The Performance And Control Of The Permanent Magnet Synchronous Motor With Similar Number Of Poles And Slots And The Stator Tooth Chamfering

The permanent magnet synchronous motor with similar number of poles and slots has a wide range of applications and excellent performance.The main performances include large power density,fast dynamic response,and high operating efficiency.But there is a serious problem of the zigzag leakage flux.This paper proposes to reduce the zigzag leakage flux by stator tooth chamfering,and study the influence of stator tooth chamfering on the iron loss of the stator core of the motor;Analytical expressions of the no-load radial air gap magnetic field and cogging torque of the motor after stator tooth chamfering.At the same time,this paper also conducted a detailed study on the speed estimation of the Hall position sensor.Firstly,in view of the serious problem of the zigzag leakage flux of the permanent magnet motor with similar number of poles and slots studied in this paper,a method to weaken the zigzag leakage flux through stator tooth chamfering is proposed,and the analytical expression of the zigzag leakage flux after stator tooth chamfering are deduced,the calculation results are in good agreement with the calculation results of the finite element software,it proved that the zigzag leakage flux after stator tooth chamfering analysis expression is correct;on this basis,the influence of the stator tooth chamfering on the magnetic field alternating magnetization of each part of the stator core of the motor is analyzed.This measure can effectively restrain the stator core loss and improve the performance of the motor.Secondly,the stator tooth chamfering has a certain effect on the performance of the motor,in order to study the effect of the stator tooth chamfering on the motor performance,this paper presents an air-gap relative specific permeance function after the stator tooth chamfering,which reflects the effect of the stator tooth chamfering on the no-load air-gap magnetic field.Based on the analytical expression of the radial air gap magnetic field when the stator is smooth,the expression of no-load radial air gap magnetic field after the stator tooth chamfering is derived.The analytical expressions of electromotive force induced by motor winding and cogging torque are derived.Combined with the calculation results of finite element software and experimental results,the correctness of the analytical expression is proved,which provides a powerful tool for the design and calculation of the permanent magnet motor with similar number of poles and slots.In addition,through the analysis of the stator tooth chamfering,the cogging torque of the motor can be reduced.This paper uses genetic algorithm to optimize the optimal parameters of the stator tooth chamfering of the prototype machine,which effectively reduces the cogging torque of the motor.Third,the motor vector control system using hall position sensor needs to obtain the real-time high-precision rotor position.Whether the estimation of rotor position is accurate is closely related to whether the installation position of hall position sensor is accurate.However,due to the influence of process level,processing and hall sensor parameter differences,the position signal of hall position sensor often appears deviation,which will lead to the following problems.In order to solve this problem,"software automatic correction method" is used to eliminate the negative effect of the position error of hall position sensor on the rotor position estimation.The validity of the method is proved by Simulink simulation.Finally,based on stm32f103ze processor,the vector control system of near pole slot permanent magnet motor is designed in this paper.Through the joint debugging of hardware and software,the experiment is carried out.The experimental results show that the vector control system designed in this paper is feasible and can realize the driving control of the prototype.