基于台架标定的IPM电机复合弱磁控制技术

Hybrid Flux Weakening Method of IPM Motor Based on Bench Calibration

内置式永磁(IPM)电机在基速以上需要进行弱磁扩速,为弥补负i_d补偿法高速稳定性差的不足,提出一种基于台架弱磁标定查表法+负i_d补偿法的复合弱磁控制技术。详细分析了台架弱磁标定方法和数据处理方式;电机运行区域判断和d,q轴电流指令由转矩指令和实际转速根据查表得到。负i_d补偿法以逆变器最大输出电压为参考值构建弱磁环,输出d轴去磁电流,使异常工况下d,q轴电流指令落到电压极限椭圆内。实验结果表明,该方法具有良好的动态响应特性,系统稳定性高。

Interior permanent magnet(IPM) motor requires flux weakening when rotor speed has exceeded base speed.In order to improve the performance of negative d-axis current compensation method, a technology combined with bench calibration look-up table and negative d-axis current compensation method is proposed.The bench calibration theory and data processing method is introduced in detail.Motor running region and d-q current instructions are acquired by loop-up table.Negative d-axis current compensation method is used to supplement the loop-up table in abnormal conditions.Experimental result demonstrated the proposed method had good response and reliability.