Patent US6034459A successfully refreshed from Google Patents.
US6034459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanent magnet type dynamo electric machine and electric vehicle using the same
Assignee: Hitachi Ltd
•
Filing: 1999-04-16
•
Granted: 2000-03-07
•
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 10:17
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.
References Cited (Backward Citations)
US4672253A
Cited
JPS63310357A
Cited
US5233250A
Cited
US5886440A
Cited
JPH07336808A
Cited
JPH08223832A
Cited
US5910691A
Cited
US5936322A
Cited
US5811904A
Cited
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 |