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A variable speed constant frequency generating system for generating constant frequency electrical output power from a variable speed source of motive power includes an exciter for generating excitation current, a main generator for developing the output power, both of the exciter and main generator

A variable speed constant frequency generating system for generating constant frequency electrical output power from a variable speed source of motive power includes an exciter for generating excitation current, a main generator for developing the output power, both of the exciter and main generator being driven by a shaft coupled to the motive power source and power converters mounted on the shaft to transfer power between the exciter and the main generator. At shaft speeds below synchronous speed, i.e. that speed which would produce the desired output frequency when DC power is coupled to the main generator field windings, the exciter output is rectified and inverted so that alternating current power of proper frequency is delivered to the field windings of the main generator to maintain the output of the generator at a constant frequency. At synchronous speed, the power converters transfer substantially only DC power to the main generator windings. At speeds above synchronous speed, power is returned back to the exciter to cause same to operate as a motor and apply negative torque to the shaft and thereby maintain the output power at the desired frequency.

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In a generating system for generating output power at a desired frequency, the system having an exciter and a main generator both with rotors connected by a shaft which is driven by a variable-speed source of motive power, the exciter rotor having an armature winding which develops alternating curre

In a generating system for generating output power at a desired frequency, the system having an exciter and a main generator both with rotors connected by a shaft which is driven by a variable-speed source of motive power, the exciter rotor having an armature winding which develops alternating current power at a frequency dependent upon the speed of the shaft, the main generator rotor having a field winding which develops a magnetic field in space occupied by a main generator armature winding which develops the output power in response to current through the field winding, a circuit connecting the exciter armature and main generator field windings, comprising: a rectifier connected to the exciter armature winding for rectifying the power developed thereby to derive DC power; an inverter connecter between the rectifier and the main generator field winding; and means coupled to the inverter and responsive to the frequency of the exciter alternative current power for controlling the inverter to convert the DC power into current for the main generator field winding to establish a magnetic field which rotates relative to the main generator armature windings at a rate which maintains the output power at the desired frequency.