无刷直流电机磁场定向控制策略研究与实现

Research and Implementation on Field Orientation Control Strategy of Brushless DC Motor

针对目前存在的无刷直流电机转矩脉动这一突出问题,介绍了无刷直流电机转矩脉动及抑制机理,提出采用磁场定向控制策略,以降低无刷直流电机的转矩脉动。给出了控制策略及实现方法,并建立系统仿真模型,将基于磁场定向控制与传统方波线电压控制的控制系统进行对比仿真研究,仿真表明基于磁场定向控制的无刷直流电机控制系统性能更好,转矩脉动更小。以STM32F103B为核心设计了磁场定向控制无刷直流电机控制系统,实测的电机相电流为近似正弦波,转速波动小,电机运行平稳。

According to the torque ripple of brushless DC motor is the most outstanding problem, this paper introduces the torque ripple and reduction mechanism. The application of field orientation control （FOC） strategy to reduce the torque ripple of brushless DC mo- tor is put forward, the control strategy and implementation method are given, and the system simulation models are established. The system based on FOC is compared with system based on traditional square wave line voltage modulation method, the simulation results show the control performance of brushless DC motor based on FOC introduced is better, torque ripple is smaller. STM32F103B is used as the control core to design the Brushless DC motor control system test platform based on FOC. The phase current curve is approximate sine wave, speed ripple is small, operation is stable.