| 摘要 |
PROBLEM TO BE SOLVED: To obtain an overvoltage protector that protects a capacitor and a power converter in a driving device for driving a synchronous machine against overvoltage arises from a no-load induced voltage produced in the synchronous machine at the time of regeneration.SOLUTION: A synchronous machine driving device includes a direct-current power supply, a power converter that converts a direct current into an alternating current and outputs it to a synchronous machine, and a regenerative energy storing means that stores regenerative energy produced in the synchronous machine. The driving device is provided with a regenerative power suppressor that detects a no-load induced voltage arisen from regenerative energy and suppresses the regenerative energy based on the no-load induced voltage, and a discharging means that discharges the regenerative energy storing means in accordance with an instruction based on the no-load induced voltage from the regenerative power suppressor. |
