初级永磁型游标直线电机设计与静态特性分析

Design and Analysis of a New Linear Primary Permanent Magnet Vernier Machine

提出一种新型初级永磁型游标直线(LPPMV)电机,该电机的绕组和永磁体均安装于电机初级,而电机次级仅为设有凸极的导磁铁心,结构简单、牢固。基于磁齿轮效应,次级凸极对位于电机初级齿表面的永磁体产生的磁场进行调制,产生波长长、运行速度快的谐波磁场,由该谐波磁场作为有效励磁的LPPMV电机具有低速、大电磁推力密度的特点。在深入分析运行原理的基础上,利用等效磁路法推导了该电机的功率尺寸方程,给出了电机的初步设计方法。利用有限元方法,研究了其静态特性,具体包括空载磁链、空载感应电动势、电感、定位力和电磁推力等。仿真和样机实验结果表明,该电机具有推力密度大、定位力小等特点,特别适用于如海浪发电等低速、大推力直驱系统。

In this paper a new linear primary permanent magnet vernier （LPPMV） machine is proposed. The primary side consists of an iron core with salient teeth wound with 3-phase armature windings and PMs mounted on the surface of stator teeth. The translator is designed as a simple iron core with salient teeth so that it is very robust to transmit high thrust force. Based on the magnetic-gear effect, the magnetic field modulation function of the translator teeth can produce a high-speed magnetic harmonic to improve the no-load EMF and thrust force density of the machine. Based on the analysis of the operation principle of the machine, the power equation is derived using the equivalent magnetic circuit method and the initial calculation of the main dimensions is presented. By using the finite element method, the static characteristics of the proposed machine including the PM flux linkage, no-load EMF, inductance, cogging force and thrust force are analyzed. The results show that the LPPMV machine possesses the merits of high thrust force density and low cogging force. Also, it confirms that this machine is very suitable for low-speed and high-thrust force application, such as the wave energy conversion.