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Due to the widely used brushless DC motors (BDCMs) in high-efficiency applications, many square-wave-current sensorless control methods based on voltage source inverters (VSI) had been developed in the literature. Recently, current source inverters (CSI) are receiving more and more attentions due to their inherent short-circuit protection characteristics. But no CSI-based sensorless control had been...
This paper addresses the position sensorless control for brushless DC motor (BDCM) with repetitive position-dependent load torque which is a function of the absolute rotor position (not incremental rotor position). The robust sensorless control is composed of sensorless control and robust speed control. In order to commutate winding currents, the former one estimates the incremental rotor positions...
After studying the development of BDCM sensorless control with six-step square-wave PWM (SWPWM) and six-step back-EMF detecting scheme (BEDS), the BDCM sensorless control with twelve-step SWPWM and twelve-step BEDS had been proposed and implemented in this paper. The proposed twelve-step BEDS generates the twelve commutation instants from six back-EMF zero-crossings during each cycle where the six-step...
This paper presents the robust sensorless operation for brushless DC motors (BDCMs) loaded by the position- dependent load where the load torque is a function of the rotor angle (not electrical angle). Without any position sensor, the reliable position signals are generated from the motor terminal voltages through sensorless circuits. In order to reduce the speed variations especially in the low speed,...
Brushless DC motors (BDCM) possess higher efficiency than the conventional induction motors (IM) and thus, BDCMs have been widely used in the DC compressors. Since the conventional position sensors cannot work well in the hermetic compressors, many control method without position sensor for DC compressors have been proposed. The performance of DC compressors is improved after the proposed sensorless...
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