1942 - 1947 Chevrolet Shop Manual



	12-9

	At the same time current flows from the generator positive to the generator (GEN) terminal of the regulator. From this terminal a circuit through the voltage winding of the voltage regulator to ground and back to the grounded negative of the	voltage winding of the circuit breaker to magnetize its core sufficiently to attract the circuit breaker armature and close the points, establishing a circuit from the generator to the battery as shown in Fig. 16. VOLTAGE REGULATOR It will be noted by referring to Fig. 18 that the generator voltage is impressed across the voltage winding of the voltage regulator at all times. Note also that any change in generator voltage will make a corresponding change in the current value passing through the voltage winding of the regulator. Such being the case, the magnetic strength of the voltage winding varies directly as the generator voltage. As the generator voltage increases to a predetermined value (7.2 to 7.4) fixed by the regulator setting, the magnetic pull on the voltage regulator armature increases until the armature is attracted toward the core, against the spring tension, opening the regulator points.


	Fig. 17-Field Circuit with Regulator Points Closed generator is established. Fig. 18. At the same time a current flows through the series windings of both the current regulator and circuit breaker, thence

		Fig. 19-Field Circuit with Voltage Regulator Points Open The shunt field circuit must now pass through the resistance unit, Fig. 19. This adds to the resistance of the shunt field circuit, thereby reducing the current value passing through the field winding. The net result of this is a drop in generator voltage. This, in turn, reduces the current value passing through the regulator voltage winding, reducing its magnetic strength, allowing the spring tension to immediately close the regulator points, eliminating the resistance from the field circuit, thus allowing the generator voltage to build up again. This cycle of operation occurs many times per second, resulting in the voltage being held practically constant.
	Fig. 18-Voltage Coil Circuit through the voltage winding of the circuit breaker to ground and back to the grounded negative of the generator. When the engine speed is increased the generator voltage rises and when it has built up to 6.3 to 6.7 volts, sufficient current is forced through the