US6034459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanent magnet type dynamo electric machine and electric vehicle using the same
Assignee: Hitachi Ltd
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Filing: 1999-04-16
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Granted: 2000-03-07
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Expires: 2019-04-16
Abstract
Abstract A permanent magnet type dynamoelectric machine for driving a motor vehicle has a stator with a stator iron core and a rotor with a rotor iron core facing the stator iron core through an air gap permitting rotation of the rotor. A plurality of permanent magnets are embedded along the circumference of the rotor iron core. The mechanical angle θ formed about an axial center by the outer circumferential width of a side of each of the permanent magnets which face the stator is set to, θ=n×τ.sub.s +16/P wherein τ s is the slot pitch of the stator 1 in mechanical angle, P is number of poles of the dynamoelectric machine and n is an integer.
Inventors
- 👤 Yutaka Matsunobu
- 👤 Fumio Tajima
- 👤 Shouichi Kawamata
- 👤 Takashi Kobayashi
- 👤 Suetaro Shibukawa
- 👤 Osamu Koizumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:06
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/274; H02K1/2753; H02K1/276; B; B60; B60L; B60L15/00; B60L15/20; B60L50/00; B60L50/50; B60L50/51; B60L50/60; B60L50/66; B60L2220/00; B60L2220/10; B60L2220/16; B60L2240/00; B60L2240/40; B60L2240/42; B60L2240/423; B60L2270/00; B60L2270/10; B60L2270/14; B60L2270/145; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/70; Y02T10/72
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
120 words
A permanent magnet type dynamoelectric machine comprising: a stator having a stator iron ore in which a stator winding is wounds; a rotor having a rotor iron core facing the stator iron core through an air gap, permitting rotation of the rotor; and a plurality of permanent magnets embedded along a circumference of the rotor iron core; wherein a mechanical angle θ formed by an outer circumferential width of each of said permanent magnets at a side facing said stator, relative to the axial center of said rotor is set as, θ≈n×τ.sub.s +16/P wherein τ s is a slot pitch of said stator in mechanical angle, P is a pole number of the dynamoelectric machine and n is an integer.
Claim 2
Dependent Claim
120 words
A permanent magnet type dynamoelectric machine comprising: a stator having a stator iron ore in which a stator winding is wounds; a rotor having a rotor iron core facing the stator iron core through an air gap, permitting rotation of the rotor; and a plurality of permanent magnets embedded along a circumference of the rotor iron core; wherein a mechanical angle θ formed by an outer circumferential width of each of said permanent magnets at a side facing said stator, relative to the axial center of said rotor is set as, θ≈n×τ.sub.s +16/P wherein τ s is a slot pitch of said stator in mechanical angle, P is a pole number of the dynamoelectric machine and n is an integer.
Claim 3
Dependent Claim
22 words
A permanent magnet type dynamo electric machine according to claim 1, wherein each of said permanent magnets has a rectangular cross section.
Claim 4
Dependent Claim
22 words
A permanent magnet type dynamo electric machine according to claim 1, wherein each of said permanent magnets has an arcuate cross section.
Claim 5
Dependent Claim
131 words
A permanent magnet type dynamoelectric machine comprising: a stator having a stator iron core in which a stator winding is wound; a rotor having a rotor iron core facing the stator iron core through an air gap, permitting rotation of the rotor; and a plurality of permanent magnets embedded along a circumference of the rotor iron core; wherein while being buried therein, characterized in that a mechanical angle θ about an axial center of said rotor, formed by an outer circumferential width of a side of each of said permanent magnets which faces the stator, is set to approximately 32°; the number of slots of said stator is 48; a slot pitch of said stator in mechanical angle is 7.5°; and the number of poles of the dynamoelectric machine is 8.
Claim 6
Dependent Claim
131 words
A permanent magnet type dynamoelectric machine comprising: a stator having a stator iron core in which a stator winding is wound; a rotor having a rotor iron core facing the stator iron core through an air gap, permitting rotation of the rotor; and a plurality of permanent magnets embedded along a circumference of the rotor iron core; wherein while being buried therein, characterized in that a mechanical angle θ about an axial center of said rotor, formed by an outer circumferential width of a side of each of said permanent magnets which faces the stator, is set to approximately 32°; the number of slots of said stator is 48; a slot pitch of said stator in mechanical angle is 7.5°; and the number of poles of the dynamoelectric machine is 8.
Claim 7
Dependent Claim
200 words
An electric vehicle comprising: a battery for supplying a DC voltage; an invertor which inverts the supplied DC voltage to an AC voltages; and a permanent magnet type dynamoelectric machine which outputs a driving torque for the electric machine using the inverted AC voltage; wherein the permanent magnet type dynamoelectric machine includes a stator having a stator iron core in which a stator winding is wound, a rotor having a rotor iron core facing the stator iron core through an air gap permitting rotation of the rotor, and a plurality of permanent magnets embedded along a circumference of the rotor iron core a mechanical angle θ formed about an axial center of said rotor, by an outer circumferential width of a side of each of said permanent magnets which faces the stator is set to approximately θ≈n×τ.sub.s +16/P wherein τ s is a slot pitch of said stator in mechanical angle, P is a number of poles of the dynamoelectric machines, and n is an integer, whereby the permanent magnet type dynamoelectric machine outputs a predetermined driving torque and either a wheel or a wheel driving shaft of the electric vehicle is directly driven by the predetermined output driving torque.
Claim 8
Dependent Claim
200 words
An electric vehicle comprising: a battery for supplying a DC voltage; an invertor which inverts the supplied DC voltage to an AC voltages; and a permanent magnet type dynamoelectric machine which outputs a driving torque for the electric machine using the inverted AC voltage; wherein the permanent magnet type dynamoelectric machine includes a stator having a stator iron core in which a stator winding is wound, a rotor having a rotor iron core facing the stator iron core through an air gap permitting rotation of the rotor, and a plurality of permanent magnets embedded along a circumference of the rotor iron core a mechanical angle θ formed about an axial center of said rotor, by an outer circumferential width of a side of each of said permanent magnets which faces the stator is set to approximately θ≈n×τ.sub.s +16/P wherein τ s is a slot pitch of said stator in mechanical angle, P is a number of poles of the dynamoelectric machines, and n is an integer, whereby the permanent magnet type dynamoelectric machine outputs a predetermined driving torque and either a wheel or a wheel driving shaft of the electric vehicle is directly driven by the predetermined output driving torque.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-03-07 | 2003-09-06 | 2004-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-03-07 | 2007-09-06 | 2008-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-03-07 | 2011-09-06 | 2012-03-07 | $7700.00 | Window Closed / Lapsed |