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A new sensorless control algorithm of BLDCM(Brushless Direct Current Motor) is proposed. The estimated torque constant of motors is ideally constant, but it begins to decrease at commutation point(CP) because the back EMF drops at this point. Therefore, CP can be detected for the sensorless control of BLDCM by estimating torque constant. The proposed control algorithm is simple, robust to the parameter...
This paper presents combined BLDC/PMSM control drive, which is assisted by low-cost Hall effect sensors for rotor position estimation. The major aim is to produce smooth torque and current in order to improve the efficiency of the drive without using any encoder. During the Encoderless PMSM control mode, the rotor position estimation is achieved by means of Taylor series expansion based on the Hall...
Redundancy structure is widely adopted by motors in aircrafts and special vehicles with rigorous reliability requirements. This paper presents an electrical/mechanical hybrid four-redundancy brushless DC motor (BLDCM) and the corresponding driving control system. High reliability can be achieved by adopting the electrical/mechanical hybrid structure. An engineering prototype is designed and developed...
This paper presents a comprehensive research on torque ripples of brushless dc motor drive in conduction region based on the mathematical models.The phenomenon of torque ripples of conduction exists because of diode freewheeling happened under the conventional PWM schemes. Through theoretical and mathematical analysis, a new method for reducing the torque ripple in brushless dc motors with a single...
This paper presents a comprehensive research on torque ripples of brushless dc motor drive in conduction region based on the mathematical models.The phenomenon of torque ripples of conduction exists because of diode freewheeling happened under the conventional PWM schemes.Through theoretical and mathematical analysis, A new method for reducing the torque ripple in brushless dc motors with a single...
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