Prime-mover dynamo plants – Electric control – Starting and generating dynamo
Patent
1976-04-13
1978-06-06
Schaefer, Robert K.
Prime-mover dynamo plants
Electric control
Starting and generating dynamo
290 46, 290 39, 290 49, 290 52, F02N 1104
Patent
active
040938697
ABSTRACT:
Method and apparatus for accelerating a large inertia load from rest to a predetermined speed of rotation by means of a synchronous dynamoelectric machine. A synchronous dynamoelectric machine, such as a turbine generator, which is mechanically coupled to a gas turbine prime mover, is started synchronously to bring the gas turbine up to a speed which exceeds its stall speed under load. The rotor field winding of the synchronous dynamoelectric machine is connected to receive direct current excitation from a rotatable rectifier assembly of a brushless exciter. During starting, a quadrature axis winding disposed around the stator of the brushless exciter is energized by single phase alternating current. Alternating current excitation is induced by transformer action within the rotor armature winding of the exciter and is applied to the rotor field winding after being rectified by the rotatable rectifier assembly. The transformer action operates independently of the rotation of the rotor member of the synchronous dynamoelectric machine so that the brushless exciter develops direct current field excitation for starting purposes when the rotor is at rest. Polyphase alternating current excitation is applied to the synchronous dynamoelectric machine stator winding to establish a dynamic magnetic field which rotates at a speed proportional to the frequency of the applied excitation. Interaction of the static magnetic field of the rotor and the rotating stator field produces the mechanical turning force. The frequency of the synchronously applied stator excitation is increased from substantially zero cycles per second to a higher frequency until the rotor member has accelerated synchronously to the desired speed of rotation.
REFERENCES:
patent: 3591844 (1971-07-01), Schonebeck et al.
patent: 3764815 (1973-10-01), Habock et al.
patent: 3908130 (1975-09-01), Lafuze
patent: 3908161 (1975-09-01), Messenger
Gorden Dale I.
Hoffmann Arthur H.
Kilgore Lee A.
Mutter Michael K.
Schaefer Robert K.
Telfer G. H.
Westinghouse Electric Corp.
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