IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0707794
(2007-02-17)
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등록번호 |
US-7372185
(2008-05-13)
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발명자
/ 주소 |
- Hirzel,Andrew D.
- Crecelius,David R.
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출원인 / 주소 |
|
대리인 / 주소 |
Ernest D. Buff & Associates, LLC
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인용정보 |
피인용 횟수 :
4 인용 특허 :
4 |
초록
▼
A high intensity lighting system comprises a plurality of high intensity discharge lamps electrically connected to a polyphase alternator and a prime mover mechanically connected to the alternator. An inherent impedance characteristic of the alternator permits the lamps to be reliably started and en
A high intensity lighting system comprises a plurality of high intensity discharge lamps electrically connected to a polyphase alternator and a prime mover mechanically connected to the alternator. An inherent impedance characteristic of the alternator permits the lamps to be reliably started and energized without any separate ballast or comparable impedance element. The alternator comprises a stator having teeth extending from a backiron. The teeth consist of the alternator phases, and the coils encircle the respective teeth of each pair and are wound in opposite sense and connected in series. The machine is preferably an axial airgap device wherein the stator assembly has a magnetic core made from low loss, high frequency material. A high pole count permits the electrical device to operate at high commutating frequencies, with high efficiency, high power density and improved performance characteristics. Low-loss materials incorporated by the device include amorphous metals, nanocrystalline metals, optimized Si--Fe alloys, grain-oriented Fe-based materials or non-grain-oriented Fe-based materials.
대표청구항
▼
What is claimed is: 1. A polyphase alternator, comprising: (a) at least one stator assembly comprising: a stator core comprising a plurality of tooth sections extending from a backiron section; and a plurality of stator phase windings, each phase winding comprising a plurality of connected coils, e
What is claimed is: 1. A polyphase alternator, comprising: (a) at least one stator assembly comprising: a stator core comprising a plurality of tooth sections extending from a backiron section; and a plurality of stator phase windings, each phase winding comprising a plurality of connected coils, each coil encircling one of said tooth sections; (b) at least one rotor assembly supported for rotation about an axis and including a plurality of poles, said rotor assembly being arranged and disposed for magnetic interaction with said at least one stator assembly; and (c) wherein said tooth sections of said stator core consist of pairs of circumferentially adjacent teeth, an equal number of said pairs being associated with each of said phases of said alternator, and said coils encircling said respective teeth of each pair being wound in opposite sense and connected in series. 2. The alternator of claim 1, wherein each of the phases of said alternator has a magnetic circuit, and each of said magnetic circuits is substantially free of inter-phase magnetic interaction with the others of said magnetic circuits during operation of said alternator. 3. The alternator of claim 1, wherein each of said tooth sections terminates in a free end opposite said backiron section, and said coil is disposed over a portion of that tooth section to a point of separation from said free end, the separation being sufficient to provide said alternator with a preselected inductance. 4. An alternator as recited by claim 1, wherein said alternator is a radial airgap machine. 5. An alternator as recited by claim 1, wherein said alternator is an axial airgap machine. 6. An alternator as recited by claim 1, wherein said alternator comprises one stator assembly and one rotor assembly. 7. An alternator as recited by claim 5, comprising one said rotor assembly and two said stator assemblies. 8. An alternator as recited by claim 7, wherein said stator phase windings are equally apportioned between said stator assemblies. 9. An alternator as recited by claim 5, wherein said alternator comprises an additional stator assembly having windings adapted to supply electrical power for non-lighting appliances. 10. An alternator as recited by claim 1, wherein said stator core comprises low core loss magnetic material comprising laminated layers composed of at least one material selected from the group consisting of amorphous metal, nanocrystalline metal, and optimized Fe-based alloy. 11. An alternator as recited by claim 10, wherein said laminated layers are composed of amorphous metal. 12. An alternator as recited by claim 1, wherein said stator core comprises low core loss magnetic material having a core loss less than "L" when operated at an excitation frequency "f" to a peak induction level "Bmax" wherein L is given by the formula L=12��f��B1.530 ��f2.3��B2.3, the core loss, excitation frequency and peak induction level being measured in watts per kilogram, kilohertz, and teslas, respectively. 13. An alternator as recited by claim 1, wherein said alternator is adapted to run with a commutating frequency of at least about 200 Hz. 14. An alternator as recited by claim 13, wherein said commutating frequency ranges from about 500 Hz to 3 kHz. 15. An alternator as recited by claim 1, wherein said rotor assembly comprises a plurality of rotor permanent magnets. 16. An alternator as recited by claim 15, wherein said magnets are composed of a rare earth-transition metal alloy. 17. An alternator as recited by claim 16, wherein said magnets are SmCo or FeNdB magnets. 18. An alternator as recited by claim 1, wherein each of said tooth sections terminates in a free end opposite said backiron section, and said coil is disposed over a portion of that tooth section to a point of separation from said free end, the separation being sufficient to provide said alternator with a preselected inductance.
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