永磁无刷直流电机直接转矩控制

永磁无刷直流电机以其效率高、噪音低、易维护等优点在工业控制的各个领域得到了越来越广泛的应用。但是，永磁无刷直流电机存在较大的转矩波动，这就限制了它在高精度系统中的应用。直接转矩控制具有瞬时转矩控制的特点。它直接在定子坐标系下观测电机的磁链、转矩，并将此观测值和给定值进行比较，差值经滞环控制器得到相应的控制信号，再综合当前的磁链状态来选择相应的电压空间矢量，实现对电机转矩的直接控制。该文尝试将直接转矩控制方法用于永磁无刷直流电机的控制，以期达到抑制转矩波动的目的。仿真及实验结果表明，该文提出的方法能够较好地抑制永磁无刷直流电机的转矩波动，并且具有很高的动态响应速度。

The Direct Torque Control for Permanent Magnet Brushless DC Motors

Permanent magnet brushless DC motors (BLDCM) have been more and more widely used in industry applications because of their advantages such as higher ratio of power to volume, lower noise and easier maintenance compared to permanent magnet DC servo motors. However, torque ripple generated in commutation period is the main drawback of BLDCM, which make the application of BLDCM in the high accuracy system impossible. The direct torque control (DTC) can control the torque instantly. This method observes the fluxlink and torque of the motor in the stator coordinate, and compares the observed values with the set values to obtain the error. And then the control signal is obtained by inputting the error to the controller. Finally, with this control signal and the state of fluxlink, the corresponding voltage space vector is selected, so that the torque can be controlled directly. In this paper, DTC is used to control the BLDCM, in the purpose of reducing the torque ripple. Simulation and experiment results show that the DTC method can minimize the torque ripple of BLDCM effectively and gain rapid dynamic response.