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Prior starting/generating systems which operate a generator as a motor to start a prime mover have been inefficient since motive power was delivered to the prime mover through hydrostatic trim and differential components of a constant speed drive interposed between the prime mover and the generator.

Prior starting/generating systems which operate a generator as a motor to start a prime mover have been inefficient since motive power was delivered to the prime mover through hydrostatic trim and differential components of a constant speed drive interposed between the prime mover and the generator. In order to overcome this problem, means are provided between the prime mover and the generator for bypassing these components of the constant speed drive when operating in a starting mode so that motive power is transferred directly to the prime mover. This, coupled with the fact that the generator is operated as a motor responsive to generator speed and/or generator power factor, increases the efficiency of the system when in the starting mode.

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In a starting/generating system including a prime mover, a generator having a main generator portion and an exciter portion for providing excitation to a field winding of the main generator portion and a constant speed drive (CSD) having hydrostatic trim and differertial components coupled between t

In a starting/generating system including a prime mover, a generator having a main generator portion and an exciter portion for providing excitation to a field winding of the main generator portion and a constant speed drive (CSD) having hydrostatic trim and differertial components coupled between the prime mover and the generator, the system being operable in a starting mode in which motive power developed by the generator is delivered to the prime mover to start same and in a generating mode in which motive power developed by the prime mover is delivered to the generator so that the generator develops electrical power, the improvement comprising: first means operable in the starting mode for providing AC power to the exciter portion; second means operable in the starting mode for providing AC power to armature windings of the main generator portion to cause the generator to operate as a motor; and means coupled between the generator and the prime mover for bypassing the hydrostatic trim and differential components of the CSD when in the starting mode so that motive power developed by the generator is transferred directly to the prime mover.