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In this study, pulse-width modulation is used to simulate the signals of a sine wave in driving a three-phase brushless DC motor with eight poles. Three hall sensors are placed on different locations on the circuit board under the stator, around which the rotor spins. The position of the rotor can be determined with the signals generated by the hall sensors during the spinning of the rotor. In a spinning cycle, the six positions of the rotor decide when phase changes occur and which MOSFETs to turn on and off in the circuit. This study compared the performances of the proposed sine-wave controller to a standard six-step square-wave controller regarding current, noise, and vibration.
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