To save data in a memory and to set a state so that an accident does not occur by using regenerative power in accordance with slowing-down revolution of a motor when power supply from the outside is interrupted.

When supply of AC power from a commercial AC power source 74 is interrupted, since interruption is detected, and a switch 91 is turned off, regenerative power of a motor 85 is preferentially supplied to an EEPROM substrate 82 and a high voltage substrate 83 among many electronic components, even when a supply amount of the regenerative power in accordance with slowing-down revolution of the motor 85 is small, and supply time of the regenerative power is short, the regenerative power is effectively utilized. In addition, an electrolytic capacitor 95 which supplies discharged power is miniaturized.