基于统一式的无刷直流电动机换相转矩脉动抑制新策略  

A Novel Strategy to Suppress Commutation Torque Ripple in Brushless DC Motor Based on Unitive Formula

作　　者：陈基锋[1] 张晓峰[1] 吴小康[1] 杭丽君[1] 吕征宇[1] 

机构地区：[1]浙江大学电气工程学院,杭州310027

出　　处：《电工技术学报》2011年第4期51-56,共6页Transactions of China Electrotechnical Society

摘　　要：分析了无刷直流电动机(BLDCM)换相转矩脉动产生的本质,在BLDCM及逆变器数学模型的基础上推导出了不同PWM控制方式的换相转矩脉动统一式。在只有单级逆变器的调速方式下,基于直流母线电流控制,提出了一种全速度范围内抑制电动机换相转矩脉动的PWM控制方法,保证换相期间开通相和关断相电流上升率和下降率相等。该方法算法简单,与传统的控制方法相比,只需在换相时让开通相和关断相同时进行PWM控制,且无需重新计算PWM控制的占空比,易于实现数字控制,响应速度快。最后实验结果验证了该新方法抑制换相转矩脉动的显著效果,适合用于高精度要求下的无刷直流电动机控制。This paper presents essential analysis on the reason of commutation torque ripple in brushless DC motor（BLDCM）.A unitive formula being suitable for different PWM schemes is derived to calculate the commutation torque ripple from the mathematic model of BLDCM.In order to suppress torque ripple in whole speed range,a new PWM strategy which can equalize the rising and falling slopes of phase current is proposed based on DC link current control.The new method has the advantage of simplicity,compared with the traditional control method.The outgoing phase is still holding modulation during commutation region without recalculating the PWM duty cycle,and digital control with fast dynamic response can be easily realized.Finally,the experienmental results verify the significant effectiveness of the new method,and it is preferable for the BLDCM drive system with aimed of high accuracy-controlling.

关 键 词：无刷直流电动机 换相转矩脉动 脉宽调制 直流母线电流控制 

分 类 号：TM351[电气工程—电机]