BALDWIN LOCOMOVTIVES |
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rent to the traction motors. The voltage char- acteristics of the generator are such that, with increasing current the voltage is reduced so that the maximum current, under any condi- tions, is only equal to the maximum starting current of the traction motors. The self-excited, variable speed auxiliary generator mounted on the main generator shaft, delivers full power at from half to full engine speed to all auxiliary motors such as those of the traction motor blower, radiator |
of the speed or tractive effort at the drawbar. The main generator output is automatically adjusted to meet intermittent auxiliary de- mands such as those of the air compressor motor or radiator fan motor. If one or more diesel engine cylinders become inoperative, the main generator output is automatically reduced to correspond with the reduced engine output so that the engine is not overloaded. It should be understood that the Servo Field Regulator, as described above, is the method |
is arranged with the four traction motors con- nected in parallel. This simplifies the control circuits in that no transition from series to series parallel is required. With the parallel connection of traction motors, the tendency for continued slipping of the wheels of the loco- motive is reduced. In the case of series con- nection of motors, once a wheel commences to slip, it continues to slip until the operator shuts off the power. The Allis-Chalmers Automatic Servo Field Regulator is installed on locomotive 62000. This electro-mechanical device is a main gen- erator field excitation regulator, interlocked with the diesel engine governor and connected to a resistor in the circuit of the separately ex- cited field of the main generator. This device regulates the main generator excitation, not as a function of the electrical conditions, but en- tirely through the governor of the diesel engine. It automatically increases the generator voltage as the motor current decreases, so that the en- gine load is constant at all times within the operating range of the locomotive, regardless |
the necessary wiring. The box has lunged doors on all four sides, making the wiring and elec- trical devices unusually accessible in case re- placements are required. The underframe of the locomotive is an in- tegral steel casting in which are incorporated bolting lugs for the engine-generator sub-base, 500 gallon fuel oil tank (this large capacity means less frequent fuelings), storage battery compartment, sand boxes, cab steps, traction motor air ducts, and housings for draft gear and truck center pins. Storage battery com- partments are easily accessible through trap doors for filling or replacing batteries. The in- teriors of the compartments are protected with acid-resisting paint. The four-wheel swivel trucks have integral cast steel frames, incorporating air passages through the center pin and bolster to the motor inlet. The rolled steel wheels are 40 inches in diameter. The journals of 62000 are equipped |