Torque Improvement of Spoke-type Permanent Magnet Motor with Auxiliary Stator Using Harmonic Current Control Strategy  

作　　者：Hao Wu Wenliang Zhao Zheng Li Xiuhe Wang 

机构地区：[1]the School of Electrical Engineering,Shandong University,Jinan,250061,China [2]IEEE [3]the Jinan Heating Group CO.LTD.,Jinan,250011,China

出　　处：《CES Transactions on Electrical Machines and Systems》2023年第2期210-217,共8页中国电工技术学会电机与系统学报（英文）

基　　金：supported in part by the National Natural Science Foundation of China under Grant 52077123 and 51737008;in part by the Natural Science Foundation of Shandong Province of China for Outstanding Young Scholars,under Grant ZR2021YQ35。

摘　　要：The spoke-type permanent magnet motor with auxiliary stator exhibits high torque performance owing to the flux focus effects.To further improve its torque density,this paper proposes a control method by using harmonic current strategy.Based on the theoretical analysis,a 3-D torque look-up table by dq-axis current and electrical angle is established with the aid of the finite element method(FEM).The maximum torque per ampere curve at each rotor position is identified and summarized to adequately indicate the relationship between torque and current amplitude of the motor.Through theoretical derivation,it is concluded that the minimum torque cost curve is the contour line of?Te/?i2,which can be employed to identify the harmonic current for torque density improvement.Compared to traditional strategies,the proposed control strategy can increase torque density of forward and reverse torque by 1.22%and 1.40%,respectively.The experimental results verify the analysis and simulation results,as well as prove the effectiveness of the proposed strategy.

关 键 词：Spoke-type permanent magnet motor Harmonic current Finite element method Torque density Torque cost 

分 类 号：TM351[电气工程—电机]