【摘要】 基于分时换相策略的无刷直流电机直接转矩控制可以有效地抑制转矩脉动,但存在低速运行时转速超调较高的问题。现提出一种分时换相优化策略,由转矩脉动值决定换相时刻及换相时间长短,在非换相期间采用基于新型零矢量的三点式滞环控制的两相导通模式,换相期间采用三相导通模式,可最终实现全速运行时无超调、转矩脉动小的效果。在Matlab/Simulink环境下,构建一种简单的无刷直流电机直接转矩控制系统仿真模型,并通过实验仿真验证了该控制系统的可行性。更多还原

【Abstract】 The direct torque control of brushless DC motor could effectively suppress the torque ripple,which based on time-sharing commutation strategy,but there was a problem that the overshoot of the speed was high when the system work at low speed. A time-sharing optimization strategy was proposed,which determined by the value of torque ripple. In the non-commutation period,a two-phase conduction mode was adopted,which based on the new zero vector hysteresis control. Through the mode,could eventually achieve full speed operation without overshoot,and effectively suppress torque ripple. In Matlab/Simulink environment,a simple simulation model of direct torque control system of brushless DC motor was constructed,and the feasibility of the control system was verified by experimental simulation.更多还原