基于回馈升压逆变器的无刷直流电机宽速度范围转矩脉动抑制  

Torque Ripple Suppression in Wide Speed Range of Brushless DC Motor Based on Regenerative Boost Inverter

作　　者：李珍国[1] 韩启萌 贾益丞 常梦婷 Li Zhenguo;Han Qimeng;Jia Yicheng;Chang Mengting(Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province Yanshan University,Qinhuangdao 066004 China)

机构地区：[1]燕山大学电力电子节能与传动控制河北省重点实验室,秦皇岛066004

出　　处：《电工技术学报》2024年第6期1725-1736,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(61873226)。

摘　　要：无刷直流电机固有的转矩脉动问题严重限制了其在诸多高精尖场合的应用,为此该文提出一种适用于宽速度范围转矩脉动抑制的回馈升压逆变器拓扑及控制策略。在正常导通期间通过保持非换相相电流的恒定以减小转矩脉动。当电机运行在低速区间时,由于换相时所需的母线电压小于直流侧电源电压,因此通过脉宽调制便足以实现电机的平滑换相;而在更高速的情况下为实现快速换相并有效抑制换相转矩脉动,可在换相期间利用所提拓扑提升母线电压,其中额外补偿的能量均来自非换相期间电机的回馈。最后通过相应的Matlab仿真和DSP驱动实验验证了所提控制技术的可行性和有效性。Brushless DC motors are favored in aerospace,industrial automation,and household appliances because of their high power density,high efficiency,simple structure,and small size.However,the torque ripple inherent in the brushless DC motor limits its use in high-stability,high-precision applications.The torque ripple caused by commutation is the largest and can be up to 50%of the average torque.Therefore,many scholars have researched commutation torque ripple suppression from various perspectives,such as modulation,direct torque control,and control circuit topology.Among them,changing modulation methods and direct torque control often prolong the commutation time during high-speed motor operation.In order to achieve fast phase commutation while effectively suppressing commutation torque ripple,this paper proposes a regenerative boost inverter topology and control strategy for torque ripple suppression of wide-speed range.Firstly,the causes of commutation torque ripple are analyzed in terms of the PWM_ON modulation method generally used for two-phase conduction.Commutation torque ripple can be suppressed by increasing the average value of the bus voltage during commutation to twice that of the previous non-commutation period.Secondly,the relation curve between commutation torque ripple and angular speed shows that the bus voltage cannot be increased further due to the limitation of the power supply voltage.Thus,it cannot effectively suppress the commutation torque ripple when the motor runs at high speed.Therefore,the paper proposes a regenerative boost inverter topology consisting of a switching tube,a diode,an electrolytic capacitor,and a three-phase bridge inverter circuit.When the motor runs in the low-speed range,a smooth motor commutation through pulse width modulation is sufficient.As the bus voltage required for commutation is less than the power supply voltage on the DC side,no electrolytic capacitor is needed to assist in the boost.In this case,the expected value of the electrolytic capacitor voltage should

关 键 词：无刷直流电机 转矩脉动 回馈升压 宽速度范围 

分 类 号：TM351[电气工程—电机]