摘要：本文介绍永磁同步电机的弱磁控制工作原理和典型控制策略，并结合在汽车电动转向系统中应用时所关注的重点，推荐二种弱磁控制策略及推导出控制算法；本文所设计的弱磁控制算法，通过对其在应用中的输出特性计算分析，来评价各种条件下的电机运行工作状态，以便适当修正算法使电机充分发挥其输出能力。
关键词：电动助力转向系统；永磁同步电机；q轴电流；d轴电流；弱磁控制
Abstract: Introduced the working theory and the typical strategy on magnetic field weakening control for Permanent Magnet Synchronous Motor (PMSM) in this paper. Recommended two strategy when the PMSM was used in Electric Power Steering system (EPS) for Auto, and derived their algorithm. One of the two algorithm was designed in this paper, evaluated the PMSMs working state in various condition by calculating and analyzing their output characteristics, for the PMSMs power is maximum by modifying.
Key words: electric power steering system (EPS); permanent magnet synchronous motor (PMSM); qaxis current; daxis current; magnetic field weakening control