双定子锥形永磁同步电机的弱磁研究  

Research on Flux-Weakening of Dual-Stator Conical Permanent Magnet Synchronous Motors

作　　者：柴凤[1] 欧景[1] 裴宇龙[1] 

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,哈尔滨150001

出　　处：《电工技术学报》2013年第7期12-18,共7页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51077023);中央高校基本科研业务费专项资金(HIT.ICRST.2010013)资助项目

摘　　要：提出一种新型的双定子锥形永磁同步电机方案,该电机由外内两个电机定子和锥形转子构成。通过控制内电机定子电流,实现锥形转子的轴向移动以增大气隙长度,同时减小定转子的耦合面积,从而实现永磁同步电机的弱磁扩速运行。论文给出了几种常见的双定子锥形永磁电机结构方案并阐述了其工作原理;建立了锥形永磁电机的等效磁网络和三维有限元模型,对其磁场分布及气隙磁通密度随锥角及转子轴向位移的变化进行了仿真分析,研究该类电机空载反电动势变化及弱磁扩速能力。研制了双定子锥形样机,对空载反电动势随锥角和轴向位移变化趋势进行了实验验证;理论分析和实验研究一致性良好。本文研究表明双定子锥形电机不仅具有良好的弱磁扩速性能,还具有宽恒功率区等优点,可为永磁电机弱磁扩速提供借鉴。In this paper, a novel dual-stator conical permanent magnet synchronous motor（PMSM） is proposed and the dual-stator conical PMSM（DSCPMSM） consists of outer stator, inner stator and conical rotor. By controliing its inner stator current, the conical rotor can move axially to increase the air gap length and to reduce the coupling area between stator and rotor. Therefore, the PMSM operates in flux-weakening mode. The paper presents several common dual-stator conical PMSM structures and analyzes their working principles. Moreover, the equivalent magnetic network of conical PMSM and its three dimensional finite element analysis model are established. Further, the distribution of magnetic field and flux density value in air gap are simulated with different cone angles and rotor axial displacements. In addition, no-load back EMF and flux-weakening ability of the motor are analyzed. Finally, a dual-stator conical PMSM prototype was developed and tests on no-load back EMF with different cone angles and rotor axial displacements were carried out. It has been proved that the experimental results are well consistent with theoretical analysis. It can be concluded that dual-stator conical PMSMs have a good performance of flux-weakening and a wide constant power region. This paper can provide a reference for researchers in PMSM flux-weakening.

关 键 词：双定子 锥形转子 永磁同步电机 弱磁 恒功率 

分 类 号：TM315[电气工程—电机]