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The air conditioning compressor has an electromagnetic clutch that
can engage or disengage the compressor pulley. The compressor pulley
always turns when the engine is running, but the compressor only runs
when the pulley is engaged to the compressor driving shaft.
When this system is activated, current runs through the
electromagnetic coil. The current attracts it to the armature plate.
The strong magnetic pull draws the armature plate against the side of
the turning pulley. This locks the pulley and the armature plate
together; the armature plate drives the compressor.
When the system is deactivated, and current stops running through the
electromagnetic coil, flat springs pull the armature plate away from
the pulley.
The magnetic coil does not turn since its magnetism is transmitted
through the pulley to the armature. The armature plate and hub
assembly are fastened to the compressor drive shaft. When it's not
driving the compressor, the clutch pulley turns on a double row of
ball bearings.
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