Abstract: An electromagnetic clutch for a compressor in an air conditioning apparatus for an automobile. A temperature fuse unit 13 is arranged in an electric circuit for an electromagnetic coil of the clutch for opening the circuit when a temperature increase is generated due to an occurrence of seizing. The temperature fuse unit 13 is arranged in a coil housing 4 at a location adjacent a frictional surface 2a of a rotor of the clutch and an inner sleeve portion 4a of the coil housing 4. During normal operation of the clutch, heat around the electromagnetic coil is transmitted to the coil housing of an increased heat conductivity, made of a magnetizing metal materials, thereby preventing the temperature around the temperature fuse 13 from being increased.

Abstract: A compressor includes a plurality of pistons, a shaft and a wobble plate rotatably and swingably connected with said shaft so that the pistons are reciprocated in accordance with the wobbling movement of the wobble plate. The capacity of the compressor is varied in accordance with the inclining angle of the wobble plate. The actual capacity of the compressor is detected by the magnetic sensor. The compressor has a through member at the lower most portion of the pressure chamber provided in the housing and the slider is slidably connected with the through member. The slider also rotatably connected with the wobble plate so that the wobbling movement of the wobble plate makes the slider reciprocate along with the through member. Such movement of the slider is detected by the magnetic sensor.