Starting exciter for a generator
AssigneeSiemens Westinghouse Power Corporation
InventorsRobert J. Nelson, Dennis Perttula, Stephen Cates, Aaron Staley
Life of this patent
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Abstract
A dynamoelectric machine combining the functions of an exciter, a turning motor, and a starting motor for a turbine. The machine operates in a first mode where the slip between a first stator winding and a first armature winding is positive and thus the magnetic fields interact and operate as a motor to turn the turbine. In a second mode the slip is negative as the turbine turns the shaft and the first stator winding and the first armature operate as an exciter for supplying excitation to the rotating field winding of a main generator.
Claims16
A dynamoelectric machine operative as a starter for a turbine, comprising:
- a first stator winding;
- a turbine shaft;
- a rotating armature winding magnetically coupled to said first stator winding and mounted on said turbine shaft for rotation with respect to said first stator winding, wherein said rotating armature winding comprises a plurality of electrical poles;
- wherein application of AC power to said first stator winding induces a magnetic field in said rotating armature winding and causes slip-induced rotation of said rotating armature winding with respect to said first stator winding such that a rotational force is imposed on said turbine shaft.
A dynamoelectric machine for producing cyclical output power in response to rotational energy supplied by a prime mover, comprising
- a first stator winding;
- a turbine shaft;
- a rotating armature winding magnetically coupled to said first stator winding and mounted on said turbine shaft for rotation with respect to said first stator winding;
- a second stator winding;
- a field winding magnetically coupled to said second stator winding and mounted on said turbine shaft for rotation with respect to said second stator winding;
- a rectifier bridge;
- wherein alternating current is supplied to said first stator winding for inducing a magnetic field in said rotating armature winding, in a first operational mode causing positive slip-induced rotation of said rotating armature winding with respect to said first stator winding such that a rotational force is imparted to said turbine shaft;
- and wherein application of a rotational force to said turbine shaft by the prime mover causes operation in a second operational mode such that the slip is negative and said first stator winding induces a magnetic field in said rotating armature winding by generator action, and wherein the output from said rotating armature winding is supplied as an input to said rectifier bridge, and wherein said rectifier bridge produces a DC output signal current supplied as an input to said field winding to produce generator action in said second stator winding for producing the output AC power.
The dynamoelectric machine of claim 16 wherein the alternating current supplied to the first stator winding has a variable voltage.
Dependencies are inferred from the claim text.