中文摘要：

针对无刷直流电机在高精度驱动领域中转矩脉动过大,影响电机稳定性的问题,提出了采用新型Z源变换网络的转矩脉动抑制新方法。通过增加一级电容拓扑和滤波网络,改变了传统Z源变换器电路特性,使之具有更高的增益和更好的可靠性,并将这种新型结构用于电机换相转矩脉动的抑制中。同时针对转矩脉动抑制过后电机将升速的问题,加入PI调节器,改变母线电压以维持转速恒定。仿真结果表明,无论在低速还是高速,都能得到较为平滑的转矩,转矩脉动都控制在7%左右,同时转速维持在给定值,验证了所提出Z源变换网络的正确性,为无刷直流电机优化建模提供了依据。

英文摘要：

For excessive torque ripple of brushless dc motor （BLDCM） in the application of high-precision drive, a new Z-source transformation network is proposed in order to suppress torque pulsation. By adding a capacitor topol- ogy and a filter network, the proposed network changes characteristics of the traditional Z-source inverter circuit and has a higher gain and a better reliability, which is applied to the suppression of BLDCM commutation torque ripple. An issue of increased velocity of the motor will happen after suppression, so a PI regulator is added to regulate bus voltage to maintain a constant speed. The simulation results show that torque ripple can be limited below 7% both under the low-speed and the high-speed so that the smooth torque is obtained. In addition, the speed is maintained at a given value, which verifies the effectiveness of the proposed Z-source network.