考虑永磁磁链变化的内嵌式永磁同步电动机弱磁转矩控制

摘要

The reluctance torque of the interior permanent magnet synchronous motor (IPMSM) is suitable for speed expanding operation,and the field weakening control is required in high speed operation in order to maintain high torque output.Considering the change of permanent magnet flux in different actual operating conditions,this paper studies the field weakening torque control for IPMSM and analyzes the relationship between the change of permanent magnet flux and the instruction current error.Therefore,a novel method of field weakening torque control based on instruction current lookup table is proposed.The method consists of three parts,including instruction current lookup table,voltage limit calculation and current correction direction calculation.The validity of the proposed method is verified by comparing simulations with the traditional filed weakening control.The output torque error under the change of permanent magnet flux is decreased obviously due to the application of proposed method.%内嵌式永磁同步电动机(Interior permanent magnet synchronous motor,IPMSM)具有磁阻转矩使其利于扩速运行,在高速运行时需要弱磁控制来维持高转矩输出.针对IPMSM永磁磁链随实际运行工况变化的情况,研究了IPMSM弱磁转矩控制,分析了永磁磁链变化与指令电流偏差的关系,并提出了一种基于指令电流查表的弱磁转矩控制新方法.该方法主要包括指令电流查表、电压限制计算和电流修正方向计算三部分.通过与传统弱磁控制进行对比仿真验证了该方案的有效性,方案在永磁磁链变化时的输出转矩偏差明显降低.