一种减少永磁同步电机转矩脉动方法

对内埋式永磁同步电机直接转矩控制系统特性进行了深入研究.针对内埋式永磁同步电机直接转矩控制存在较大脉动转矩的缺点,提出了一种新的永磁同步电机直接转矩控制策略.以减小转矩脉动为目标引入模糊逻辑思想,将磁链偏差和磁链偏差的变化率进行了合理的模糊分级,模糊调节选择电压矢量和反电压矢量作用时间.这种方法可以保持恒定的开关频率并有效地减小转矩脉动.为了获得高性能的无速度传感器内埋式永磁同步电机控制系统,设计了一种无速度传感器方案.最后,通过仿真验证了所提控制策略的有效性.

Torque ripple minimization in direct torque control of a permanent magnet synchronous motor

The basic theory of direct torque control (DTC) for interior permanent magnet synchronous motors (IPMSM) was studied. A new approach to direct torque control of an interior permanent magnet synchronous motor was presented to decrease torque ripple. In order to improve the static and dynamic performance of the system, a fuzzy logic idea was introduced into the system. In the fuzzy direct torque control system, the flux error and the flux error change were both properly divided into several fuzzy subsets. The acting time of the selected voltage vector and reverse voltage vector were modulated based on fuzzy inference. A speed estimation scheme was integrated with the proposed DTC scheme in order to achieve a fully sensorless high-performance IPMSM drive. The scheme not only maintains constant switching frequency, but also reduces torque ripple, particularly at low speed. Simulation illustrates the operation and performance of the proposed fuzzy-logic-based controller.