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This paper studies a soft starter of six-phase BLDC motor, presents a soft start method based on complex programmable logic device (CPLD), analyzes the soft starting process of six-phase BLDC motor and the influence of PWM carrier frequency and duty on starting process, employs back EMF zero crossing detection circuit to detect the rotor position, designs the hardware circuit and program of the soft...
The paper analyzes the steady commutation process of the BLDC motor using PWM mode, confirms the commutation time to keep non-commutation phase current amplitude constant during commutation period by way of PWM in the period to implement the compensation control to eliminate commutation torque ripple under both low speed and high speed operation, investigates the effect by PWM mode on a three-phase...
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