摘要
无刷直流电动机传统的120°导通模式,在每60°电角度需要进行开关切换使电流换相,在电流变化的过程中会产生较大的转矩脉动,从而影响无刷直流电动机的控制性能。针对无刷直流电动机开关切换时电流变化所产生的转矩脉动,分析了180°导通模式下的电流在不同转速范围内的变化过程,指出了在高速状态下,相比传统的120°导通模式,180°导通模式能抑制换相时间的增加,使相电流快速达到稳态,减小转矩脉动,但在低速状态则不利于缩短开关切换时间和抑制转矩脉动。采用TMS320F2812和电机内置的霍尔传感器以及相应的驱动模块,对电机两种导通模式进行了对比实验,验证了理论分析的正确性。
In the 120° conduction mode of brushless DC motors,the torque ripple which restricts the prospects for development of the motors increases in the commutation time. The change process of current at different speed ranges in 180°conduction mode was analyzed. In comparison with 120° conduction mode,commutation time and the torque ripple in 180°conduction mode could reduce at high speed,but not at low speed. TMS320F2812 and Hall sensors were used to make verification experiments in the two modes. Results verify the correctness of the analysis.
出处
《微特电机》
北大核心
2014年第12期69-73,共5页
Small & Special Electrical Machines
