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An excitation system for a brushless generator includes an exciter portion having a set of polyphase exciter field windings and an additional exciter field winding disposed in a stator of the generator, a source of polyphase, constant-frequency AC power and circuitry coupled to the set of polyphase

An excitation system for a brushless generator includes an exciter portion having a set of polyphase exciter field windings and an additional exciter field winding disposed in a stator of the generator, a source of polyphase, constant-frequency AC power and circuitry coupled to the set of polyphase field winding for connecting the source of polyphase, constant-frequency AC power thereto at a beginning of operation in a starting mode whereby AC power is induced in an exciter portion armature winding by transformer action. AC power is further provided to armature windings of a main generator portion to thereby cause a rotor of the generator to accelerate. An autotransformer is provided to reduce the voltage provided by the source of polyphase AC power prior to application of such power to the polyphase field windings so that the need for an auxiliary inverter is obviated. Thereafter, at least one of the windings of the set of polyphase windings is connected in series with the additional field winding when the speed of the rotor reaches a predetermined speed and a DC current of controlled magnitude is delivered to the series-connected exciter field windings to thereafter allow operation in a generating mode.

대표청구항 ▼

An excitation system for a brushless generator having a main generator portion including a field winding disposed on a rotor and which receives field current and an armature winding disposed in a stator wherein the rotor is movable with respect to the stator and the generator is operable in a genera

An excitation system for a brushless generator having a main generator portion including a field winding disposed on a rotor and which receives field current and an armature winding disposed in a stator wherein the rotor is movable with respect to the stator and the generator is operable in a generating mode to convert motive power into electrical power which is developed in the armature winding and in a starting mode to convert electrical power provided to the armature winding into motive power, comprising: an exciter portion having a set of polyphase field windings and an additional field winding, all of the exciter portion field windings being disposed in the stator, the exciter portion further having an armature winding disposed on the rotor and coupled to the main generator portion field winding; a source of polyphase, constant frequency AC power; means coupled to the set of polyphase field windings for connecting the source of polyphase, constant frequency AC power thereto at a beginning of operation in the starting mode wherein AC power is induced in the exciter portion armature winding by transformer action and wherein the rotor is accelerated during such time wherein such connecting means connects at least one of the windings of the set of polyphase field windings in series with the additional exciter field winding when the speed of the rotor reaches a predetermined speed; and means for delivering a DC current of controlled magnitude to the series-connected exciter field windings after the rotor reaches the predetermined speed.