ELECTRICAL SYSTEMSYSTEMS OPERATIONTM 5-3805-263-14&P-2The field winding (1) is a stationary coil assemblythat provides the magnetic field.The rotor provides the north and south poleswhich cut the magnetic field between the stationaryfield winding and the stator (2). North and southpoles arc separated magnetically by a non-magneticring (5).STARTING SYSTEM COMPONENTSStarter MotorThe starter motor is used to turn the engine fly-wheel fast enough to get the engine to start running.The starter motor has a solenoid. When the startswitch is activated, the solenoid will move the starterpinion to engage it with the ring gear on the flywheelof the engine. The starter pinion will engage with thering gear before the electric contacts in the solenoidclose the circuit between the battery and the startermotor. When the circuit between the battery and thestarter motor is complete, the pinion will turn theengine flywheel. A clutch gives protection for thestarter motor so that the engine can not turn thestarter motor too fast. When the start switch is re-leased, the starter pinion will move away from thering gear.SolenoidA solenoid is a magnetic switch that does two basicoperations:a. Closes the high current starter motor circuitwith a low current start switch circuit.b. Engages the starter motor pinion with the ringgear.The solenoid switch is made of an electromagnet(one or two sets of windings) around a hollow cy-linder. There is a plunger (core) with a spring loadinside the cylinder that can move forward and back-ward. When the start switch is closed and electricityis sent through the windings, a magnetic field is madethat pulls the plunger forward in the cylinder. Thismoves the shift lever (connected to the rear of theplunger) to engage the pinion drive gear with the ringgear. The front end of the plunger then makes con-1-22
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