Optimization Design And Temperature Field Analysis Of Permanent Magnet Synchronous Motor With Weak Magnetic Speed Regulation Are Considered

Permanent magnet synchronous motor has no brush and slip ring in structure,and it is simple to manufacture.The magnetic field is generated by permanent magnet,which makes the motor small in size and high in efficiency.With the continuous development of power electronic devices,permanent magnet synchronous motor is widely used in various fields and daily life.In this paper,the embedded speed-regulating permanent magnet synchronous motor and its control system as the research object,from its optimization design,motor performance simulation and temperature field analysis and other aspects of the research,the specific content is as follows:1.In view of the general permanent magnet synchronous motor cannot meet the new energy vehicle’s requirements for the wide speed range of permanent magnet synchronous motor,through the analysis of the mathematical model of permanent magnet synchronous motor and the weak magnetic control principle,it is concluded that the speed range of the motor is mainly affected by the two parameters of the motor weak magnetic rate and the convex pole rate.Aiming at the determination of these two parameters,the optimization algorithm in electromagnetic field simulation software is used to carry out automatic optimization simulation calculation on the motor structure parameters such as the width of permanent magnet,the length of the magnetization direction and the distance from the axis,and the influence of the size and position of the permanent magnet on the two parameters of the weak magnetic rate and salient pole rate is obtained.The performance of the optimized motor is analyzed,and it is verified that the optimized motor can meet the speed regulation range of twice the rated speed.2.To solve the problem that the control strategy cannot be combined with the electromagnetic field ontology simulation of the motor,a simulation model based on ANSYS/Maxwell,Simplorer and Matlab/Simulink was established for the field circuit coupling of permanent magnet synchronous motor.The maximum torque/current control(MTPA)strategy was used under the base speed of the motor through the field circuit co-simulation method.Above the base speed,the weak magnetic field control strategy is used to make the motor cooperate with different control strategies in different working states,and the performance of the motor in different states,such as speed,torque and current,is obtained,which makes up for the shortcoming that the electromagnetic field simulation alone cannot match the motor control strategy.3.The motor temperature field simulation,cannot accurately add coefficient of heat transfer problems,using the computational fluid dynamics simulation software,through the air layer around the motor add boundary conditions and settings,and so on operation,can make the software to automatically calculate of coefficient of heat transfer of the motor,improve the accuracy of the motor temperature field calculation.And for the optimized motor,combined with the loss calculated by the co-simulation of the two motors in different control strategies,the permanent magnet synchronous motor is simulated and analyzed under different loads and different heat dissipation conditions,and the temperature field distribution and radial temperature distribution of the whole motor are obtained,which can provide a reference for the reasonable use of the motor.