基于小母线电容的高过载小型化电机驱动技术研究

Research on High Overload and Miniaturized Motor Drive Technology Based on Small Capacitance

本文针对小母线电容控制策略中低速转矩性能降低以及衍生的低频异音问题,提出了基于变母线电容电路拓扑和控制算法,达到提升低速转矩性能,解决低频异音的目的。首先分析了传统小母线电容控制策略转矩性能降低和低频噪音问题产生的机理;然后提出了基于小电容能量分时控制策略,解决了低频异音的问题并且低速转矩性能提升15.9%;针对网侧谐波电流超标的问题,提出了基于变母线电容电路拓扑和控制算法,网侧谐波电流GB/T 17625.1-2012标准,并且兼顾了低速转矩性能。最后实验验证了该方案的有效性。

Aiming at the low-speed torque performance reduction and low-frequency abnormal noise problem in the small bus capacitor control strategy,this paper proposed a circuit topology and control algorithm based on variable bus capacitor to improve the low-speed torque performance and solve the low-frequency abnormal noise problem.Firstly,a mechanism of torque performance reduction and low frequency noise of traditional small bus capacitor control strategy was analyzed;Then the time-sharing control strategy based on small capacitance energy was proposed,which solves the problem of low-frequency abnormal noise and improved the low-speed torque performance by 15.9%;In view of the problem that the harmonic current at the grid side exceeds the standard,a circuit topology and control algorithm based on variable bus capacitance were proposed.The harmonic current at the grid side is in accordance with the GB/T17625.1-2012 standard,and the low-speed torque performance is considered.Finally,the experiment verified the effectiveness of the scheme.