Study on Magnetic Flux Weakening Control Strategy of Interior Permanent Magnet Synchronous Motor

内置式永磁同步电动机弱磁控制策略的研究

¹ College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China
² Dingzhou Power Supply Company of State Grid, Dingzhou 073000, China
³ Maintenance Branch of Shanxi Electric Power Company, Taiyuan 030000, China

Received: 11 October 2017

Abstract

When the maximum ratio of torque to current strategy is used for IPMSM flux weakening speed regulation, it is needed to solve nonlinear High-Order equations determining the direct and quadrature axis current given value. Facing this problem, the paper used the curve fitting and obtained the given current, improved the control accuracy of the system. At the same time, in the weak magnetic high speed zone, proposed a new over-modulation control algorithm, which through the optimization of voltage vector and phase, achieved a natural transition of different modulation region, increased the output voltage of the inverter, and enhanced the stator voltage and output torque when motor runs at a certain speed given value, expanded steady weak magnetic region of IPMSM when the load torque is certain.

摘要

内置式永磁同步电动机采用最大转矩电流比弱磁调速方法时，需要求解一个非线性的高次方程组，来确定交直轴电流的给定值。针对这个问题，采用曲线拟合的方法，得到了较精确的电流给定，提高了控制系统的精度。同时，在弱磁高速区，提出了一种新的过调制控制算法，通过对电压矢量和相位的优化，实现了不同调制区的自然过渡，提高了逆变器的输出电压，在转速一定的情况下，提升了电机带负载能力；在负载转矩一定的情况下，拓展了永磁同步电机弱磁调速区域。