Permanent magnet dynamoelectric rotating machine and electric vehicle equipped with the same
First Claim
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1. A permanent magnet electric machine comprising:
- a stator provided with windings thereon; and
a rotor disposed with an air gap between the stator and the rotor, and having a plurality of permanent magnets fixed along a circumference thereof, with spacing between adjacent magnets;
wherein a circumferential extent of surfaces of the permanent magnets facing the stator is selected so that an induced voltage in the machine has a waveform which approximates a sinusoidal waveform; and
an angle θ
, whose sides are radii of the rotor passing through opposite circumferential ends of a surface of each permanent magnet which is nearer to the stators, is smaller than an angle ψ
, whose sides are radii of the rotor passing through opposite circumferential ends of a surface of each permanent magnet which is farther from the stator.
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Abstract
A permanent magnet dynamoelectric rotating machine comprises a stator provided with windings; and a rotor disposed with an air gap between the stator and the rotor, and provided with a plurality of permanent magnets arranged along the circumference of the rotor and fixed to the rotor. The circumferential length of a surface of each permanent magnet facing the stator is determined so that an induced voltage has a waveform approximate to a sinusoidal waveform to suppress the peak of the induced voltage.
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Citations
2 Claims
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1. A permanent magnet electric machine comprising:
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a stator provided with windings thereon; and
a rotor disposed with an air gap between the stator and the rotor, and having a plurality of permanent magnets fixed along a circumference thereof, with spacing between adjacent magnets;
whereina circumferential extent of surfaces of the permanent magnets facing the stator is selected so that an induced voltage in the machine has a waveform which approximates a sinusoidal waveform; and
an angle θ
, whose sides are radii of the rotor passing through opposite circumferential ends of a surface of each permanent magnet which is nearer to the stators, is smaller than an angle ψ
, whose sides are radii of the rotor passing through opposite circumferential ends of a surface of each permanent magnet which is farther from the stator.- View Dependent Claims (2)
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Specification
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Current AssigneeHitachi Car Engineering Company Limited (Hitachi, Ltd.), Hitachi, Ltd.
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Original AssigneeHitachi Car Engineering Company Limited (Hitachi, Ltd.), Hitachi, Ltd.
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InventorsKobayashi, Takashi, Tajima, Fumio, Shibukawa, Suetaro, Oda, Keiji, Matsunobu, Yutaka, Kawamata, Shouichi, Koizumi, Osamu
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Primary Examiner(s)NGUYEN, TRAN N
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Application NumberUS09/498,030Time in Patent Office480 DaysField of Search310/156, 310/181, 310/261, 29/596-598US Class Current310/156.38CPC Class CodesH02K 1/278 Surface mounted magnets; In...Y02T 10/64 Electric machine technologi...
