新型无刷直流电机换相转矩脉动的抑制控制方法

文中分析了永磁无刷直流电机的换相原理，以换相电流为研究对象，在研究了电机运行于高速区和低速区时换相电流预测控制规则基础上，提出了一种抑制换相转矩脉动的方法。该方法结合了换相电流预测控制和直流母线负电流消除特性。在换相期间通过检测直流母线上的电流，采用换相电流预测，确保在换相期间关断相的电流下降率和开通相的电流上升率相等，从而保证了换相期间非换相相电流的恒定，并同时结合直流母线上负电流消除措施，有效地减小了换相电流的脉动，达到抑制换相转矩脉动的目的。通过仿真和实验验证了所述方法的正确性。

A Novel Control Scheme to Suppress the Commutation Torque ripple in BLDCM

The theory of commutation process in Brushless DC Motor(BLDCM)was analyzed.After the study of the commutation current prediction law in high speed regions and low speed regions,a novel control scheme,which was composed of the commutation current prediction and the negative DC current elimination,was proposed to suppress the commutation torque ripples.In the proposed method,the negative DC current was eliminated and the ascending speed of current in the upcoming phase and descending speed of current in the outgoing phase are equal in commutation interval to keep the non-commutation phase current constant,which is based on the non-commutation phase current sensing.The simulated and experimental results verified the validity of the proposed method.