Abstract
In this paper, a variable reference speed control of a high-speed Brushless DC(BLDC) motor for blender machines is proposed for reducing the speed ripple at the high-speed pulsating load variation condition. A high-speed 2-pole BLDC motor is designed to satisfy the operating speed and the efficiency of the blender machine. According to the pulsating load, the motor speed is pulsated by the conventional current limit control scheme in the constant power region. In order to improve the grinding performance, the reference speed is automatically varied to overcome the pulsating load variation in the proposed method. From the reference speed control, the output torque of the motor can satisfy the pulsating load of the blender machine. The designed high speed BLDC motor and the proposed control scheme are verified by simulations and experiments.
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