[특허]Permanent magnet generator

[미국특허] Permanent magnet generator 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H02P-009/48 H02P-009/00 H02K-007/12 H02K-021/02
출원번호	US-0233805 (2011-09-15)
등록번호	US-8823331 (2014-09-02)
발명자 / 주소	Lovejoy, Kim A.
출원인 / 주소	Lovejoy Controls Corporation
대리인 / 주소	Ryan Kromholz & Manion, S.C.
인용정보	피인용 횟수 : 0 인용 특허 : 36

초록 ▼

A permanent magnet generator having the unique feature of a speed proportionally adjusted air gap for self-regulation of coil output voltage over a wide range of operating rotational speed of a steam turbine to which the invention is coupled. The Permanent Magnet Generator rotor is supported by the turbine end shaft and the stator is supported by a bracket bolted to the turbine pedestal base or other rigid structure. The speed proportional air gap is accomplished through the use of a plurality of centrifugal flyweights in mechanical coupling to a spool piece under spring load and to corresponding rare earth magnets via linkage such that increasing rotor speed extends the flyweights outward from the rotor center of rotation and draws the rare earth magnets closer to the rotor center of rotation and thus increases the air gap.

대표청구항 ▼

1. A permanent magnet generator for use with a turbine having an output shaft, the permanent magnet generator comprising: a rotor with a plurality of radially positioned linearly movable magnets, said rotor mounted to the steam turbine output shaft;a stationary annular stator with a plurality of radially positioned coils;the plurality of magnets being movable to vary an air gap between said magnets and said coils; anda plurality of centrifugal flyweights mechanically coupled with linkage bars and a spring-opposed spool piece to each magnet of the plurality of magnets thereby providing an increasing magnet-to-coil air gap with increasing turbine output shaft speed. 2. A permanent magnet generator of claim 1 whereby the magnets are movably responsive to a rotational speed of said rotor. 3. A permanent magnet generator of claim 1 whereby the plurality of magnets have sufficient radial position travel to reduce a flux density for purposes of regulating a voltage output from said plurality of coils. 4. A permanent magnet generator of claim 1 whereby the centripetal force of the plurality of flyweights applied over a pivot moment is greater than the centripetal force of the plurality of magnets as applied to the linkage bars and spool piece with the difference in centripetal forces resisted by a coil spring adjacent to the spool piece thereby metering net magnet motion with speed. 5. A permanent magnet generator of claim 1 wherein the magnets comprise rare earth magnets. 6. A permanent magnet generator for use with a turbine having an output shaft, the permanent magnet generator comprising: a rotor coupled to said output shaft;said rotor housing a plurality of linearly movable magnets radially arranged about said rotor;each of said magnets of said plurality of magnets being coupled to a centrifugal flyweight;an annular stator having a plurality of coils being positioned about said rotor;each centrifugal flyweight being coupled to a spring-opposed spool piece by one or more linkage bars; andwhereby an air gap formed between each magnet (of said plurality of magnets and each coil of said plurality of coils varies depending upon a rotational speed of said rotor. 7. A permanent magnet generator of claim 6 wherein the plurality of magnets have sufficient radial position travel relative to the plurality of coils to reduce a flux density for regulating voltage output from said plurality of coils. 8. A permanent magnet generator of claim 6 whereby the centripetal force of the plurality of flyweights applied over a pivot moment is greater than the centripetal force of the plurality of magnets as applied to the linkage bars and spool piece with the difference in centripetal forces resisted by a coil spring adjacent to the spool piece thereby metering net magnet motion with speed. 9. A permanent magnet generator of claim 6 wherein the magnets comprise rare earth magnets. 10. A permanent magnet generator of claim 6 wherein the coils of the plurality of coils further comprise coil outputs. 11. A permanent magnet generator of claim 6 whereby the magnets are movably responsive to a rotational speed of said rotor.

이 특허에 인용된 특허 (36) 인용/피인용 타임라인 분석

Holden Karel (Bleekhofstraat 27 2018 Antwerp BEX) Holdenova Ladislava (Bleekhofstraat 27 2018 Antwerp BEX), Alternator.
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Woodward ; Jr. Richard C., Axial force electrical machines.
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Rao Dantam K., Axial gap motor with radially movable magnets to increase speed capablity.
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Zepp, Lawrence P.; Medlin, Jerry W., Brushless permanent magnet motor or alternator with variable axial rotor/stator alignment to increase speed capability.
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Lawrence P. Zepp ; Jerry W. Medlin, Brushless permanent magnet motor with variable axial rotor/stator alignment to increase speed capability.
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Zepp,Lawrence P.; Medlin,Jerry W., Brushless permanent magnet wheel motor with variable axial rotor/stator alignment.
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Parker Denson (2072 Center Blvd. Springfield OH 45506), Centrifugal force magnetic field variator.
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Cruz, Ethan E.; Trifilo, Timothy M., Centrifugal magnetic clutch.
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Himmelmann, Richard A.; Shahamat, Mohammad, Coaxial twin variable field permanent magnetic dynamoelectric machine.
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Hsu John S., Direct control of air gap flux in permanent magnet machines.
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Takeuchi, Kesatoshi, Electric motor device.
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Jermakian Joel B. ; Crain Stephen G. ; Knudtson Cory D. ; Piacesi Robert F. D., Electric motor with active hysteresis-based control of winding currents and/or having an efficient stator winding arrangement and/or adjustable air gap.
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Ai, Xiaolan; Mularcik, Bradley; Knepper, Richard, Electric motor with field weakening.
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Lamb Karl J. (Port Angeles WA), Magnetic centrifugal clutch.
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Fennern Larry E. (San Jose CA), Nuclear reactor with bi-level core.
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Krueger William R., Output regulation of internal combustion engine alternator by mechanical means.
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Lamb Karl J., Permanent magnet coupler with adjustable air gaps.
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Himmelmann,Richard A.; Shahamat,Mohammad; Halsey,David G., Permanent magnet dynamoelectric machine with axially displaceable permanent magnet rotor assembly.
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Gieras, Jacek F.; Rozman, Gregory I., Permanent magnet dynamoelectric machine with variable magnetic flux excitation.
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Gieras, Jacek F.; Rozman, Gregory I., Permanent magnet electric generator with variable magnet flux excitation.
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Kouba Carroll C. (Fort Shawnee OH), Permanent magnet generator.
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Raad Bernard A., Permanent magnet generator.
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Hatz, Ernst; Moser, Franz, Permanent magnet generator having internal stator with adjustable air gap.
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Brissey George Edward (Erie PA) Richter Eike (Erie PA), Permanent magnet generator with output power adjustment by means of magnetic shims.
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Horber, Ralph W., Permanent magnet motor having flux density characteristics that are internally variable.
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Hashiba, Mitsuharu; Kihara, Nobuhiro, Permanent-magnet generator.
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Kihara,Nobuhiro; Imaizumi,Kaoru, Permanent-magnet generator having protrusions for dissipating heat.
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Nazareno Edgardo V. (San Jose CA) Dillmann Charles W. (Morgan Hill CA), Reactor-core isolation cooling system with dedicated generator.
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Bernard Raad ; Leon Kasdan, Regulated permanent magnet generator.
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Lindbery John R. ; Mehrayin Kourosh ; Reichard Jeffrey A., Regulation system for a permanent magnet generator.
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Maslov, Boris A.; Soghomonian, Zareh, Rotary permanent magnet electric motor with varying air gap between interfacing stator and rotor elements.
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Hirzel,Andrew D., Selective alignment of stators in axial airgap electric devices comprising low-loss materials.
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Miller Robin M. (Ellington CT), Self-adjusting airgap motor/generator for flywheel system.
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Gizaw, Daniel; Erdman, David M.; Miller, Joseph E.; Desta, Girma, Slow-speed direct-drive generator.
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Calistrat Michael M. ; Revak Lynn A., Speed control system for a prime mover.
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Alberto Patarchi IT, Universal electric motor with variable air gap.
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[미국특허] Permanent magnet generator 원문보기

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