PURPOSE: To prevent the occurrence of the chopping noises of the AC voltage in the wiring of the position signal from a motor from the driving-voltage feeding wiring of the brusheless motor, to prevent the malfunction of a driving circuit, and to prevent the breakdown and the like of the driving circuit by the abnormal rotation and the stop of the rotation of the motor.

CONSTITUTION: A brushless motor 4 is mounted on an outdoor unit 1 of an air conditioner. A fan 5 is rotated, and air is sent into an outside heat exchanger 3. During cooling operation, the refrigerant, which is cooled with a compressor 2, enters into the outside heat exchanger through a four-way valve. The refrigerant is condensed and liquified and sent into inner devices, and the inside of the chamber is cooled. The position of a rotor is detected by a Hall element attached in the inside of a motor and sent out to a control circuit part 9 with a wiring 10. A driving signal is generated with the control circuit part on the basis of the position signal. The driving signal is inputted into a driving circuit 7 through a wiring 11. The switching of the DC voltage, which is rectified and smoothed from the AC current power supply is controlled, and the voltage is converted into the chopped AC voltage. The voltage is supplied into the motor through a wiring 12.