高速无位置无刷直流电机控制系统的 精确换相仿真研究

为了实现对高速无位置无刷直流电机的控制，针对其在高速状态下的换相不准确问题，在分析直流无刷电机的工作原理和数学模型的基础上，使用传统反电势过零点法及电流和速度双闭环PID控制，将检测到的单相电压和单相电流的相位差作为换相误差对换相信号进行相位补偿，最后通过Matlab/Simulink进行仿真实验。仿真结果表明，该控制系统运行速度可以达到1×105 r/min，经过补偿后的换相信号，可以使速度更快达到给定的参考转速，所需要的电流更小，且在转矩突变和转速突变的情况下稳定运行。

Research on Accurate Commutation Simulation of High Speed Positionless Brushless DC Motor Control System

In view of the realization of the control of high-speed positionless brushless DC motor, aiming at the flaw of inaccurate commutation in high-speed state, and based on the working principle and mathematical model of Brushless DC motor, the traditional back EMF zero crossing method and current and speed double closed-loop PID control are used to phase the commutation signal with the detected phase difference of single-phase voltage and single-phase current as commutation error. Finally, the simulation experiment is carried out by using Matlab / Simulink. The simulation results show that the running speed of the control system can reach as high as 1×105 r/min. After compensation, the commutation signal can make the speed reach the given reference speed faster, and the commutation signal after compensation can make the speed reach the given reference speed faster with a smaller required current. Meanwhile, the operation is relatively stable in the case of sudden change of torque and speed.