PWM控制永磁同步电机电压偏差下的损耗研究  

Investigation of loss for permanent magnet synchronous motor at voltage deviation by PWM control

作　　者：丁树业[1] 关天宇[1] 蒋山[1] 

机构地区：[1]哈尔滨理工大学电气与电子工程学院,黑龙江哈尔滨150080

出　　处：《电工电能新技术》2016年第6期18-23,共6页Advanced Technology of Electrical Engineering and Energy

基　　金：国家自然科学基金(51277045);黑龙江省普通高等学校新世纪人才(1254-NCET006);哈尔滨理工大学青年拔尖创新人才培养计划(201301)资助项目

摘　　要：永磁同步电机通常采用变频器进行驱动,长线路运行时易受供电质量影响出现电压偏差。为探究电压偏差对永磁同步电机损耗的影响,本文以一台50k W永磁同步电机为例,采用有限元法对其在变频驱动PWM控制时额定负载下电压发生偏差情况进行了数值计算与分析。着重研究了定子与转子铁心磁密及绕组电流的基波和谐波分量,得出了定转子铁耗、绕组铜耗以及永磁体涡流损耗的分布特性;同时,选取A相电流进行仿真并与实验测量相对比,以验证研究方法的正确性。结果表明,随着PWM控制时电压的增大,定转子铁耗、永磁体涡流损耗以及绕组铜耗均呈增加趋势。数值计算结果与实验数据相吻合。此研究可为电机设计优化提供一定参考。To drive the permanent magnet synchronous motor（ PMSM） usually adopts frequency converter which arises the problem of voltage deviation that is easily affected by the quality of power supply in the long-distance operation. For exploring the effect of voltage deviation on the loss of PMSM,a 50 k W PMSM was taken as the research object. By using finite element method and frequency conversion driving,the numerical calculation and analysis of its rated load in voltage deviation controlled by PWM were carried out. The magnetic flux density of stator core and rotor core was studied emphatically,as well as the fundamental and harmonic component of winding current. The distribution characteristic of stator core loss,rotor core loss,winding loss and permanent magnet eddy loss were obtained. At the same time,phase A current was selected to simulate and was compared with experimental measurement,which was used to verify the correctness of investigation method. The result indicates that stator core loss,rotor core loss,permanent magnet eddy loss and winding loss are all raised with the increase of voltage by PWM control. The numerical calculation result was matched with the experimental data. It can provide some reference for the motor design and optimization.

关 键 词：永磁同步电机 电压偏差 损耗 PWM控制 

分 类 号：TM351[电气工程—电机]