Electronic shorting of wound rotor windings
AssigneeGeneral Electric Company
InventorsJames H. Dymond, Raymond K. J. Ong, Dale Derr
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Abstract
A method for shorting rotor windings in a wound rotor induction machine is disclosed. The method includes the steps of monitoring rotor current for a frequency indicative of a desired steady-state operating condition and electronically shorting the rotor windings when the monitored rotor current frequency reaches a defined threshold indicative of the desired steady-state operating condition.
Claims26
A method for shorting rotor windings in a wound rotor induction machine including a rotor and a plurality of slip rings electrically connected to the rotor windings, said method comprising the steps of:
- monitoring rotor current for a frequency indicative of a desired steady-state operating condition;
- and
- imposing an electrical short between the plurality of slip rings and the rotor windings, with rotor current flowing through an electronic shorting device, when the monitored rotor current frequency reaches a defined threshold indicative of the desired steady-state operating condition such that when a plurality of brushes in electrical contact with the slip rings are removed from electrical contact with the slip rings, the electrical short between the plurality of slip rings and the rotor windings though the electronic shorting device is maintained.
A wound rotor induction motor comprising:
- a stator comprising a plurality of stator windings;
- a rotor magnetically coupled to said stator and comprising a plurality of rotor windings;
- a plurality of slip rings on said rotor electrically connected to said rotor windings, said slip rings enabling electrical connections to said rotor windings;
- a plurality of brushes configured to make and break electrical contact with said rotor during steady state operation of said motor;
- and
- an electronic circuit on said rotor configured to impose an electrical short between said plurality of slip rings and said rotor windings, with rotor current flowing through an electronic shorting device, permitting said brushes to break electrical contact with said rotor while maintaining the electrical short between said plurality of slip rings and said rotor windings through the electronic shorting device.
A wound rotor induction motor comprising:
- a stator comprising a plurality of stator windings;
- a rotor magnetically coupled to said stator and comprising a plurality of rotor windings;
- a plurality of slip rings on said rotor electrically connected to said rotor windings, said slip rings enabling electrical connections to said rotor windings;
- and
- an electronic circuit on said rotor configured to impose an electrical short on said rotor between said plurality of slip rings and said rotor windings, said electronic circuit powered by a power source circuit mounted on said rotor.
Dependencies are inferred from the claim text.