PWM Inverter with Voltage Booster with Regenerating Capability Aug mented by Double-Layer Capacitor for Driving Permanent-Magnet Synchronous Motor.

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An interior permanent magnet(IPM) synchronous motor drive system which has regenerating capability augmented by double-layer capacitors was proposed. The motor is driven by a PWM inverter with voltage booster. The voltage booster is used to control the dc link voltage in high speed region to improve the system efficiency. Furthermore, the double-layer capacitor as a storage element is combined with the PWM inverter with voltage booster to gain the efficiency for the regenerating operation. In this system, normally, the regenerative power does not return to a battery directly but is stored in the double-layer capacitors for the next motoring action to suppress the excessive regenerative current to battery, and the regenerative power returns to the battery when the regenerative energy is larger than a certain value. The charging current to the battery is controlled to a constant value to extend the life-time of the battery.The transient and steady state characteristics of the system for 1.5kW IPM motor were investigated by both simulation and experiment. Parameters of double-layer capacitor were 115V and 207F. The validity of the simulated results was confirmed by comparing the simulated results with that obtained from the experimental. Furthermore, the fact that for two modes of the regenerating operation the system works properly, is confirmed by both simulated and experimental results.The proposed system can recovery the regenerative energy effectively and would be able to contribute for the extension of the life-time of the battery.