Research On The Mechanism And Optimization Of Cogging Torque And Torque Ripple Of The Embedded Permanent Magnet Synchronous Motor

The permanent magnet synchronous motor(PMSM)has been widely used and plays an important role in various fields.This is mainly due to several significant advantages of PMSM,including high torque density,high efficiency,excellent power performance and small weight.However,although PMSM have a series of advantages,there are still many challenges in the demanding high-performance torque applications such as motor steering systems,servo motors,speed and position control systems.All of these applications require high quality torque output characteristics,i.e.higher average torque and lower torque ripple.This thesis starts from the design direction of motor body,to seek the specific relationship between torque ripple and cogging torque,and the cogging torque of interior permanent magnet synchronous motor(IPMSM),is optimized to reduce the torque ripple.Based on the above research ideas,the main contents of this thesis are as follows:1.The generation mechanism and analysis method of cogging torque and torque ripple of IPMSM are analyzed by analytical method,which provides a theoretical basis for optimizing cogging torque and torque ripple.2.The optimization scheme of the cogging torque and torque ripple of a set of IPMSM is obtained by using the simulation software to verify the optimization of the cogging torque and torque ripple with the theoretical knowledge.3.The relationship between the cogging torque and the torque ripple is studied,and the cogging torque is found to be the factor affecting the torque ripple.It is proposed that the cogging torque is not only related to the structure of the motor.Based on the combination of theory and simulation experiments,it is verified that the cogging torque of the on-load motor will produce a change in amplitude,which will affect the magnitude of torque ripple.4.The Ansoft Maxwell finite element simulation software is used to build the optimized "one" type interior permanent magnet synchronous motor,and a series of post-processing simulation experiments for performance verification are carried out.Part of the experiment combined with Matlab data analysis,and finally get an interior permanent magnet synchronous motor model with good torque performance.5.The test is carried out on the motor control platform,the no-load and load-carrying tests of the 24-16 interior permanent magnet synchronous motor prototypes constructed in this thesis are performed.The torque waveform of the actual operation is obtained,and the results are compared with the model simulation results and the causes are analyzed.