SAFARI

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

BAT-

TERY

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