考虑去磁效应的五相永磁同步电机优化开关表直接转矩控制算法

发布时间：2018-06-03 22:18

本文选题：五相永磁同步电机 + 直接转矩控制　；参考：《中国电机工程学报》2017年19期

【摘要】：多相永磁同步电机驱动系统因具有体积小、噪声低、功率密度高等诸多优点,在低压、大功率输出及可靠性要求高的场合已得到了广泛关注和应用。基于开关表的直接转矩控制(switching table direct torque control,ST-DTC)算法具有结构简单、转矩动态响应快、对电机参数依赖性低等优点,然而将其直接扩展应用于多相系统会造成较大的转矩脉动以及谐波电流。因此,该文在传统ST-DTC算法的基础上,首先将开关表中的电压矢量集重构为虚拟矢量集,用以消除定子电流的低次谐波,其次深入研究了电机中低速运转时由于定子电阻造成的去磁效应,并且重新设计了开关表用以克服该问题,保证了电机磁链的控制需求,最后根据电机的转矩脉动规律采用多阶非对称结构的滞环比较器,优化了转矩纹波。实验结果表明了所提算法的正确性和有效性。
[Abstract]:The multiphase permanent magnet synchronous motor drive system has many advantages, such as small volume, low noise and high power density. It has been widely concerned and applied in the situation of low voltage, high power output and high reliability. The switching table direct torque control (ST-DTC) algorithm based on switch table has simple structure and torque. With the advantages of fast dynamic response and low dependence on the motor parameters, the direct expansion of its application to multiphase system will cause greater torque ripple and harmonic current. Therefore, on the basis of the traditional ST-DTC algorithm, the voltage vector set in the switch table is reconstructed as a pseudo vector set to eliminate the low order harmonic of the stator current. Secondly, the degaussing effect caused by the stator resistance in the motor at low speed is studied, and the switch meter is redesigned to overcome the problem, and the control demand of the motor flux is guaranteed. Finally, the torque ripple is optimized by using the multi order asymmetric structure based on the torque ripple of the motor, and the experimental results show that the torque ripple is optimized. The validity and validity of the proposed algorithm.
【作者单位】：磁浮技术与磁浮列车教育部重点实验室(西南交通大学);
【分类号】：TM341

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