IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0234919
(1999-01-21)
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발명자
/ 주소 |
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출원인 / 주소 |
- Lockhead Martin Energy Research Corporation
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
26 인용 특허 :
6 |
초록
▼
A method and apparatus for field weakening in PM machines uses field weakening coils (35, 44, 45, 71, 72) to produce flux in one or more stators (34, 49, 63, 64), including a flux which counters flux normally produced in air gaps between the stator(s) (34, 49, 63, 64) and the rotor (20, 21, 41, 61)
A method and apparatus for field weakening in PM machines uses field weakening coils (35, 44, 45, 71, 72) to produce flux in one or more stators (34, 49, 63, 64), including a flux which counters flux normally produced in air gaps between the stator(s) (34, 49, 63, 64) and the rotor (20, 21, 41, 61) which carries the PM poles. Several modes of operation are introduced depending on the magnitude and polarity of current in the field weakening coils (35, 44, 45, 71, 72). The invention is particularly useful for, but not limited to, the electric vehicle drives and PM generators.
대표청구항
▼
[ What is claimed is:] [1.] A PM electrical machine, comprising:at least one stator forming a plurality of poles on opposite sides of a rotor operating space, at least two pairs of stator poles being formed, and a plurality of armature coils wound on said stator, wherein said armature coils operate
[ What is claimed is:] [1.] A PM electrical machine, comprising:at least one stator forming a plurality of poles on opposite sides of a rotor operating space, at least two pairs of stator poles being formed, and a plurality of armature coils wound on said stator, wherein said armature coils operate with an armature voltage that is related to a flux in the stator;a rotor having an axis of rotation, said rotor being disposed in the rotor operating space and being separated by at least one portion of an air gap from said at least one stator, said rotor having no field windings and said rotor having a plurality of poles disposed around the axis of rotation, in which at least one of said poles contains permanent magnet material for producing air gap flux in said air gap, and another of said poles is without permanent magnet material, and wherein said rotor poles become aligned in operation with respective pairs of stator poles;a piece of ferromagnetic material assembled with said stator to provide a path for communicating a control flux to said stator and to said air gap through the plurality of stator poles and corresponding rotor poles; andat least one field weakening coil capable of receiving current from an external source, said field weakening coil being positioned to induce a field control flux in said piece of ferromagnetic material to adjust a magnitude and a polarity of the air gap flux through the plurality of rotor poles.
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