摘要：介绍了力矩电机直接传动在起重机提升机构中的应用，针对提升机构的快速下放控制，分析了力矩电机弱磁调速控制原理以及影响其运行范围的主要因素，考虑dq轴电流环限幅参数的影响，提出了一种基于改进电流环的电压外环弱磁控制策略。结合空间矢量脉宽调制（SVPWM）过调制算法，进一步扩大了弱磁调速运行范围。最后利用STM32微控制器实现了力矩电机弱磁调速控制系统，并通过实验验证其有效性。
关键词：力矩电机；弱磁控制；电流环；过调制算法

Abstract:  This paper introduced the application of directdrive lowspeed torque motors in cranes. To achieve the rapid down control of cranes, the principle of fluxweakening control of torque motors and its main influencing factors were analyzed. Considering the effects of the amplitude limit parameters in dq axis current loop, the voltageloop fluxweakening control scheme based on the improved currentloop was proposed. Then, the operating region of fluxweakening speed control for the torque motors was further extended with the overmodulation algorithm of SVPWM. The proposed fluxweakening speedcontrol system of the torque motors was realized by STM32 microcontroller, and it was verified with experiments.
Key words:  torque motor； fluxweakening control； current loop； overmodulation algorithm