摘要
传统无刷直流电机直接转矩控制策略通常采用两相导通模式,这种方式虽然简化了控制系统结构,但是系统高速时,其与传统脉宽调制电流控制一样,对换相转矩脉动会失去抑制作用。本文将一种改进直接转矩控制方法应用于无刷直流电机控制系统中,以求更好地减少换相引起的转矩脉动。该方法将两相导通模式与三相导通模式的电压空间矢量结合在一起,生成12个可供选择的电压空间矢量,以提高转矩滞环控制的质量。仿真结果表明,该方法能够很好地调整相电流波形以保持转矩平稳控制,特别是高速时换相转矩脉动的抑制性能更为优越。
Conventional 3-phase brushless direct current-direct torque control (BLDC-DTC) scheme usually adopts 2-phase conduction mode with simple control system. However, like the pulse width modulation(PWM) current control, this control scheme will lose restriction on torque ripple due to phase commutation at high speed. This paper presents an improved DTC method and applies it to BLDC motor control system to reduce the torque ripple. The present method combines the voltage space vectors of 2-phase conduction mode and 3-phase conduction mode to form twelve voltage space vectors for the quality enhancement of torque hysteresis control. Simulation results show that this method can adjust the phase current waveform to maintain constant torque, especially to restrain the torque ripple quite effectively at high speed.
出处
《鱼雷技术》
2014年第1期49-53,共5页
Torpedo Technology