基于换相点换相的无刷直流电机无位置传感器控制

针对无刷直流电机(BLDCM)在高速状态下的换相不准确问题，根据电机反电动势与控制算法的换相点之间存在的特定关系，提出了一种新型的无传感器控制方法。该方法通过计算电机的换相点进行换相，规避了传统算法在相位延迟估算过程中的不确定性，并提高了无位置传感器控制算法的动态响应性能；引入查表的方法简化了所提BLDCM无传感器控制算法的实现过程。通过引入一种新型的电机反电动势检测电路，对无传感器控制算法的外部实现电路进行简化，进一步降低了所提控制算法的实现成本。试验结果表明，所提反电动势检测电路能有效检测电机相电压，所提BLDCM无位置传感器控制方法十分有效、实现简单，且在动态响应上具有很大优势。

Sensorless Control of Brushless DC Motor Based on Commutation Point

In view of the inaccurate commutation of brushless DC motors in high speed state, a novel method of sensorless control is proposed based on the special relationship between the motor back electromotive force (EMF) and the commutation points. The novel method can calculate the commutation point accurately. The uncertainty of the phase delay estimation process in traditional algorithm is avoided, and the dynamic response performance of the sensorless control algorithm is improved. A look|up table method is introduced to execute the algorithm, and the implementation of the algorithm is simplified. A new type of motor phase voltage detection circuit is involved, which simplifies the external circuit of the sensorless control algorithm, and makes the implementation cost of sensorless control algorithm further decreased. Experimental results show that the circuit can effectively detect the phase voltage of the motor. The proposed algorithm is simple to implement and has great advantages in dynamic response.