SEALED MOTOR-DRIVEN COMPRESSOR

PROBLEM TO BE SOLVED: To reduce the power consumption of a PTC relay at a low cost without providing a timing circuit by providing a switch opened or closed when detecting the temperature of a main winding on the auxiliary winding of an electric element in a sealed motor-driven compressor started by the PTC relay. SOLUTION: When a sealed motor-driven compressor is started, the main winding 16 and auxiliary winding 17 of a motor element are excited to rotate a rotor, a piston is reciprocated in a cylinder by the rotation via a connecting rod fitted to the eccentric section of a shaft, and a coolant is sucked, compressed and discharged. A PTC relay 19 is self-heated to increase temperature when the auxiliary winding 17 is excited, and the current of the auxiliary winding 17 is decreased. The main winding 16 is continuously excited, the main winding 16 is self-heated to increase temperature, a bimetal stored in it reaches the reverse temperature and opens the contact point of a switch 1. When the operation of the compressor is stopped and the temperature is lowered, the switch 1 is returned before a restart.