US6239525B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanent magnet dynamoelectric rotating machine and electric vehicle equipped with the same
Assignee: Hitachi Ltd
•
Filing: 2000-02-04
•
Granted: 2001-05-29
•
Expires: 2020-02-04
Abstract
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.
Inventors
- 👤 Yutaka Matsunobu
- 👤 Fumio Tajima
- 👤 Takashi Kobayashi
- 👤 Shouichi Kawamata
- 👤 Suetaro Shibukawa
- 👤 Osamu Koizumi
- 👤 Keiji Oda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:36
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/274; H02K1/2753; H02K1/278; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
134 words
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.
Claim 2
Dependent Claim
134 words
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.
Claim 3
Dependent Claim
20 words
The permanent magnet dynamoelectric rotating machine according to claim 1 , wherein the permanent magnets have a trapezoidal cross section.
References Cited (Backward Citations)
US3840763A
Cited
US4403161A
Cited
US4322648A
Cited
US4651066A
Cited
US5157298A
Cited
US5220228A
Cited
US5159220A
Cited
US5233250A
Cited
JPH0576146A
Cited
US5510662A
Cited
US5475277A
Cited
US5670836A
Cited
US5631512A
Cited
US5672926A
Cited
US5731647A
Cited
US5844344A
Cited
US5783890A
Cited
US5936322A
Cited
US5811904A
Cited
US6034459A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-05-28 | 2004-11-27 | 2005-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-05-28 | 2008-11-27 | 2009-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-05-28 | 2012-11-27 | 2013-05-29 | $7700.00 | Window Closed / Lapsed |