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An alternating current electrical power generating system in which the generator is driven by a prime mover, such as a fluid-driven turbine, whose speed may vary, the generator rotor being coupled to the output shaft of a differential drive unit, one input of which is coupled to the prime mover and

An alternating current electrical power generating system in which the generator is driven by a prime mover, such as a fluid-driven turbine, whose speed may vary, the generator rotor being coupled to the output shaft of a differential drive unit, one input of which is coupled to the prime mover and the other input of which is coupled to a synchronous generator whose output is fed to a thyristor controlled variable load.

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An alternating current electrical power generating system comprising: a main electrical generator, a prime mover whose speed or torque could vary in use drivably coupled to the main electrical generator, a differential drive unit having an output shaft coupled to the main electrical generator and tw

An alternating current electrical power generating system comprising: a main electrical generator, a prime mover whose speed or torque could vary in use drivably coupled to the main electrical generator, a differential drive unit having an output shaft coupled to the main electrical generator and two inputs, a synchronous generator having an output, and a thyristor controlled variable load, one input of the differential drive unit being coupled to the prime mover, and the other input of the differential drive unit being coupled to the synchronous generator, the output of the synchronous generator being connected to the thyristor controlled variable load.