Rotating electrical machine with electromagnetic and permanent magnet excitation
First Claim
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1. An electrical machine comprising:
- a generally-annular stator; and
a rotor rotatably mounted within said stator and defining an axis of rotation, said rotor having an axially-extending periphery, said rotor comprising a plurality of wound-field poles disposed about at least one portion of said periphery and a plurality of permanent magnet poles all disposed about at least one circumferentially-different portion of said periphery, said wound-field poles in general axial alignment with said permanent magnet poles, said permanent magnet poles each further having a magnetized surface of one polarity generally facing said stator and a magnetized surface of the opposite polarity generally facing away from said stator;
wherein said wound-field poles are salient poles;
wherein said permanent magnet poles are disposed in circumferentially-adjacent pairs, without an intervening wound-field pole;
wherein each said circumferentially-consecutive pair of permanent magnet poles share a common radially-extending base; and
wherein said wound-field poles are disposed in circumferentially-consecutive pairs, without an intervening permanent magnet pole.
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Abstract
In several embodiments of the present invention, an alternator is disclosed. The alternator includes a rotor having both wound-field and permanent magnet poles. The wound-field and permanent magnet poles are disposed about the circumference of the rotor.
146 Citations
10 Claims
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1. An electrical machine comprising:
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a generally-annular stator; and a rotor rotatably mounted within said stator and defining an axis of rotation, said rotor having an axially-extending periphery, said rotor comprising a plurality of wound-field poles disposed about at least one portion of said periphery and a plurality of permanent magnet poles all disposed about at least one circumferentially-different portion of said periphery, said wound-field poles in general axial alignment with said permanent magnet poles, said permanent magnet poles each further having a magnetized surface of one polarity generally facing said stator and a magnetized surface of the opposite polarity generally facing away from said stator; wherein said wound-field poles are salient poles; wherein said permanent magnet poles are disposed in circumferentially-adjacent pairs, without an intervening wound-field pole; wherein each said circumferentially-consecutive pair of permanent magnet poles share a common radially-extending base; and wherein said wound-field poles are disposed in circumferentially-consecutive pairs, without an intervening permanent magnet pole. - View Dependent Claims (2, 3, 4)
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5. An electrical machine comprising:
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a generally-annular stator; and a rotor rotatably mounted within said stator and defining an axis of rotation, said rotor having an axially-extending periphery, said rotor comprising a plurality of wound-field poles disposed about at least one portion of said periphery and a plurality of permanent magnet poles all disposed about at least one circumferentially-different portion of said periphery, said wound-field poles in general axial alignment with said permanent magnet poles; wherein said wound-field poles are disposed in circumferentially-consecutive pairs. - View Dependent Claims (6, 7, 8, 9, 10)
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Specification