Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1997-04-02
1999-01-05
Dougherty, Thomas M.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 905, 310 75R, 310104, 310 68R, 310114, 310115, 417420, 4174241, H02K 4900
Patent
active
058567194
ABSTRACT:
A drive for rotating equipment that does not require internal or external mechanical seals and obviates the necessity to have internal shaft and bearings, eliminating internal lubrication problems and can be used with different types of prime movers is provided. A driven rotor, connected to the prime mover, with mounted horizontal stop rings, vertical stop rings, permanent magnet for floating rotor position, and permanent rotor drive magnet is driven by a driver rotor mounted with strain gauge and permanent magnet, electromagnet for driven rotor position and drive, strain gauges signal transmission rings, and electromagnet current transmission rings. The driver rotor, by using the signal generated by the strain gauges, varies current to the electromagnets controlling magnetic field forces to float the driven rotor. When the unit is shutdown the driven rotor rests on the vertical stop rings uncoupled. The diamagnetic rotor casing is in between the driven rotor and driver rotor and is part of the envelope separating the fluid handled from the environment. The electromagnetic-coupled/levitated drive of this invention can be used to actuate a great variety of rotating equipment in addition to the ones cited, such as multistage centrifugal compressors and multistage centrifugal pumps. The present invention will also serve as the basis for the design of new types of equipment such as the tube pump described herein. In addition, the present invention will make possible the use of sealless units for handling a tremendous variety of fluids that are harmful to people and the environment, eliminating the possibility of leakage, without the problem of maintenance of internal bearings or seals while substantially reducing equipment vibration. A method is also provided.
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Dougherty Thomas M.
Mullins B.
Payne Alton W.
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