Abstract
A novel compact slip-power recovery system having sinusoidal rotor currents is proposed. In the proposed system, a PWM boost rectifier is used as a substitute for a diode rectifier and a boost chopper in a conventional compact slip-power recovery system. The conventional compact system has the disadvantage that it has a rectangular rotor current, and the motor torque with large ripple, because a diode rectifier remains in the system. Also, the rotor current can not reach the current reference value near the synchronous speed, because the voltage drop by the resistance of the semiconductor devices and so on can not be neglected when the rotor voltage becomes smaller near to the synchronous speed. The use of the system proposed in this paper has solved these problems. The effectiveness of the proposed system was verified through computer simulations and experiments. As the results, the proposed system brings the sinusoidal rotor current, the small torque ripple, and wide controllable range near to synchronous speed.
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