基于磁极分段优化的内置式永磁同步电机齿槽转矩削弱方法

内置式永磁同步电机的齿槽转矩会带来转矩脉动、电机控制精度变差、振动与噪声等一系列的问题,因此采取有效的削弱齿槽转矩措施至关重要。采用解析计算分析了永磁体径向分段对齿槽转矩的影响,在此基础上提出了一种改进的永磁体分段方法,从而有效地减少永磁体分段后对电机的反电动势和输出平均转矩等性能的影响。此外,基于改进的永磁体非均匀分段方法,还提出了一种永磁体不等厚非均匀分段来削弱齿槽转矩的新方法,并采用有限元法对永磁体均匀分段、非均匀分段和不等厚非均匀分段3种方法进行仿真验证和对比分析。仿真结果表明,采用永磁体不等厚非均匀分段方法的齿槽转矩削弱效果最佳。

Cogging Torque Reduction of Interior Permanent Magnet SynchronousMotor with Permanent Magnet Segmentation Optimization

The cogging torque of the interior permanent magnet synchronous motor brought a series of problems such as torque ripple, motor control accuracy deterioration, vibration and noise, so it was important to take effective measures to weaken the cogging torque. The influence of radial segmenting of permanent magnet on cogging torque was analyzed by analytic calculation. Based on this, an improved segmenting method of permanent magnet was proposed, which could effectively reduce the influence of permanent magnet segmentation on the back electromotive force and output average torque of motor. In addition, based on the improved nonuniform permanent magnet segmentation, a new method of unequal thickness and nonuniform permanent magnet segmentation was proposed. Three methods of uniform permanent magnet segmentation, nonuniform permanent magnet segmentation and unequal thickness and nonuniform permanent magnet segmentation were verified and compared by the finite element method. The simulation results showed that the cogging torque attenuation effect of the new method of unequal thickness and nonuniform permanent magnet segmentation was the best.