18 AIR CONDITIONING MAGNETIC CLUTCH A magnetic clutch is used to connect and disconnect the compressor from the engine. Main components are stator, rotor, and pressure plate. Principle When the current is fed to the coil (as shown in fig. on the right), magnetic force is generated in iron 2 which attracts iron 1. Construction A magnetic clutch consists of a stator, rotor with pulley, and pressure plate to engage the drive pulley and compressor magnetically. The stator is fixed on the compressor housing, and the pressure plate is attached to the compressor shaft. Two ball bearings are used between the inner surface of the rotor and the front housing of the compressor. Operation Whenever the engine is operating, the pulley is rotating since it is connected to the crankshaft by a belt, but the compressor does not operate until the clutch is energized. When the air conditioning system is on, the amplifier supplies current to the stator coil. The electromagnet attracts the pressure plate and pulls the plate against the friction facings on the pulley. The friction between the facing and plate causes the clutch assembly to rotate as a unit, and drive the compressor. ATTRACTIVE FORCE IRON (1) SWITCH IRON 2 BATTERY ATTRACTED ELECTROMAGNET ATTRACTIVE FORCE PULLEY STATOR PRESSURE PLATE 2 Hub 4 Ring Snap 1 3 Shrims 1 Bolt Flange 5 Stator 7 Stator 6 Ring Snap 2 8 Compressor Assy. Fig. 16 Fig. 17 Fig. 18
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