Patent US3220851A successfully refreshed from Google Patents.
US5396137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brushless motor
Assignee: Panasonic Holdings Corp
•
Filing: 1993-07-28
•
Granted: 1995-03-07
•
Expires: 2013-07-28
Abstract
Abstract In a brushless motor having a stator with windings mounted in plural slots and a rotor with a permanent magnet consisting of plural poles, the poles have two kinds of occupation angles on the whole in the rotating direction of the rotor, and a difference between the two occupation angles is equal to one slot-pitch.
Inventors
- 👤 Masayuki Shinto
- 👤 Hiroshi Dohi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:36
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/03; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/274; H02K21/00; H02K21/12; H02K21/14
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
116 words
A brushless motor comprising: a stator including a stator core and stator windings, said stator core having a plurality n of teeth members which define therebetween said plurality n of slots disposed at a uniform angular interval; and a rotor including a rotor core and a permanent magnet which consists of a plurality m of pole pieces facing said stator; said plurality m being a divisor of said plurality n, and said plurality m of pole pieces having two different occupation angles Θ L and Θ S in a rotating direction of said rotor on a whole, said occupation angle Θ L being larger than said second occupation angle Θ S by an angle of (360°/n).
Claim 2
Dependent Claim
116 words
A brushless motor comprising: a stator including a stator core and stator windings, said stator core having a plurality n of teeth members which define therebetween said plurality n of slots disposed at a uniform angular interval; and a rotor including a rotor core and a permanent magnet which consists of a plurality m of pole pieces facing said stator; said plurality m being a divisor of said plurality n, and said plurality m of pole pieces having two different occupation angles Θ L and Θ S in a rotating direction of said rotor on a whole, said occupation angle Θ L being larger than said second occupation angle Θ S by an angle of (360°/n).
Claim 3
Dependent Claim
29 words
A brushless motor in accordance with claim 1, wherein two of said plurality m of pole pieces have occupation angles Θ L and are arranged adjacent to each other.
Claim 4
Dependent Claim
33 words
A brushless motor in accordance with claim 1, wherein said occupation angles Θ L and Θ S are rotationally symmetrical with respect to a 180° rotation about a rotational axis of said rotor.
Claim 5
Dependent Claim
25 words
A brushless motor in accordance with claim 1, wherein only one of said plurality m of pole pieces has said occupation angle Θ L .
Claim 6
Dependent Claim
30 words
A brushless motor in accordance with claim 1, wherein said plurality m of pole pieces are alternately arranged in accordance with said occupation angles Θ L and Θ S .
Claim 7
Dependent Claim
18 words
A brushless motor in accordance with claim 1, wherein said plurality m is an integer larger than three.
Claim 8
Dependent Claim
142 words
A brushless motor comprising: a stator including a stator core and stator windings, said stator core having a plurality n of teeth members which define therebetween said plurality n of slots disposed at a uniform angular interval; and a rotor including a rotor core and a permanent magnet which consists of a plurality m of pole pieces facing said stator; said plurality n being an integer larger than three; said plurality m being a divisor of said plurality n; and said plurality m of pole pieces of said rotor each having an occupation angle in a rotating direction of said rotor, said occupation angle being one of a first occupation angle Θ L and a second occupation angle Θ S , said first occupation angle Θ L being larger than said second occupation angle Θ S by an angle of (360°/n) .
Claim 9
Dependent Claim
142 words
A brushless motor comprising: a stator including a stator core and stator windings, said stator core having a plurality n of teeth members which define therebetween said plurality n of slots disposed at a uniform angular interval; and a rotor including a rotor core and a permanent magnet which consists of a plurality m of pole pieces facing said stator; said plurality n being an integer larger than three; said plurality m being a divisor of said plurality n; and said plurality m of pole pieces of said rotor each having an occupation angle in a rotating direction of said rotor, said occupation angle being one of a first occupation angle Θ L and a second occupation angle Θ S , said first occupation angle Θ L being larger than said second occupation angle Θ S by an angle of (360°/n) .
Claim 10
Dependent Claim
18 words
A brushless motor in accordance with claim 7, wherein said plurality m is an integer larger than three.
Claim 11
Dependent Claim
160 words
A brushless motor comprising: a stator including a stator core and stator windings, said stator core having a plurality n of teeth members which define therebetween said plurality n of slots disposed at a uniform angular interval; and a rotor including a rotor core and a permanent magnet which consists of a plurality m of pole pieces facing said stator, a first one of said plurality m of pole pieces being disposed at a first occupation angle Θ L and a second one of said plurality m of pole pieces being disposed at a second occupation angle Θ S different from said first occupation angle Θ L , said first occupation angle Θ L and said second occupation angle Θ S being in a rotating direction of said rotor; said plurality m being a divisor of said plurality n; and said first occupation angle Θ L being larger than said second occupation angle Θ S by an angle of (360°/n).
Claim 12
Dependent Claim
160 words
A brushless motor comprising: a stator including a stator core and stator windings, said stator core having a plurality n of teeth members which define therebetween said plurality n of slots disposed at a uniform angular interval; and a rotor including a rotor core and a permanent magnet which consists of a plurality m of pole pieces facing said stator, a first one of said plurality m of pole pieces being disposed at a first occupation angle Θ L and a second one of said plurality m of pole pieces being disposed at a second occupation angle Θ S different from said first occupation angle Θ L , said first occupation angle Θ L and said second occupation angle Θ S being in a rotating direction of said rotor; said plurality m being a divisor of said plurality n; and said first occupation angle Θ L being larger than said second occupation angle Θ S by an angle of (360°/n).
Claim 13
Dependent Claim
64 words
A brushless motor in accordance with claim 9, wherein a third one of said plurality m of pole pieces of said rotor being disposed at a third occupation angle which is equal to said first occupation angle Θ L , said third one of said plurality m of pole pieces being arranged adjacent to said second one of said plurality m of pole pieces.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-06 | 1998-09-05 | 1999-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-06 | 2002-09-05 | 2003-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-06 | 2006-09-05 | 2007-03-07 | $7700.00 | Window Closed / Lapsed |