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A Linear Rotary Permanent Magnet Generator(LRPMG) is proposed for wind-wave combined power generation system(WWCPGS). The rotary unit and linear unit of the LRPMG can be used to generate electricity by wind energy and wave energy, respectively. Compared with rotary generator by single wind power and linear generator by single wave power, the LRPMG can improve the utilization rate of the material and...
This paper presents a novel startup method of a brushless DC motor (BLDCM) without any reverse rotation and vibration. Using short pulse sensing method, the rotor position can be detected dynamically based on the saturation effect of the stator iron. After accelerating the motor to a certain speed at which the back-electromotive force (EMF) method is applied, all the power devices are turned off and...
In sensorless operation of brushless DC motor drives, a typical method called "back EMF method", is sampled to detect the induced EMF zero-crossing of the unexcited winding. The filters are used to eliminate high frequency components of the terminal voltages and to extract back EMF of the motor. In this paper, FFT analyses of terminal voltage contents of the BLDC motor are presented. The...
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