Patent US4554474A successfully refreshed from Google Patents.
US4554474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stator for a magnet motor
Assignee: Mitsubishi Electric Corp
•
Filing: 1984-06-12
•
Granted: 1985-11-19
•
Expires: 2004-06-12
Abstract
Abstract A stator for a magnetic motor comprising a cylindrical yoke, at least one pair of main magnetic poles formed of permanent magnets fixed to the inner peripheral surface of the yoke, at least one pair of auxiliary magnetic poles made of a soft iron material each placed at a side portion of each of the main magnetic poles, wherein an air gap formed between the inner peripheral surface of each of the main magnetic poles and the outer peripheral surface of an armature rotatably placed at the axial center of the yoke is made greater than an air gap formed between the inner peripheral surface of each of the auxiliary magnetic poles and the outer peripheral surface of the armature.
Inventors
- 👤 Akira Morishita
- 👤 Kyoichi Okamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:54
CPC Classifications
H; H02; H02K; H02K23/00; H02K23/02; H02K23/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
122 words
A stator for a magnetic motor comprising a cylindrical yoke, at least one pair of main magnetic poles formed of permanent magnets fixed to the inner peripheral surface of said yoke, at least one pair of auxiliary magnetic poles made of a soft iron material each placed at a side portion of each of said main magnetic poles, characterized in that an air gap formed between the inner peripheral surface of each of said main magnetic poles and the outer peripheral surface of an armature rotatably placed at the axial center of said yoke is made greater than an air gap formed between the inner peripheral surface of each of said auxiliary magnetic poles and the outer peripheral surface of said armature.
Claim 2
Dependent Claim
122 words
A stator for a magnetic motor comprising a cylindrical yoke, at least one pair of main magnetic poles formed of permanent magnets fixed to the inner peripheral surface of said yoke, at least one pair of auxiliary magnetic poles made of a soft iron material each placed at a side portion of each of said main magnetic poles, characterized in that an air gap formed between the inner peripheral surface of each of said main magnetic poles and the outer peripheral surface of an armature rotatably placed at the axial center of said yoke is made greater than an air gap formed between the inner peripheral surface of each of said auxiliary magnetic poles and the outer peripheral surface of said armature.
Claim 3
Dependent Claim
22 words
The stator for a magnet motor according to claim 1, wherein said main magnetic poles are constituted by ferrite permanent magnet material.
Claim 4
Dependent Claim
65 words
The stator for a magnet motor according to claim 1, wherein said air gap (rm) formed between the inner peripheral surface of said main magnetic pole and the outer peripheral surface of said armature and said air gap (rp) formed between the inner peripheral surface of said auxiliary magnetic pole and the outer peripheral surface of said armature has relationship of rm>rp and rm-rp≦0.3 mm.
Claim 5
Dependent Claim
41 words
The stator for a magnet motor according to claim 1, wherein each of said auxiliary magnetic poles is placed at the rear end side of each of said main magnetic poles with respect to the direction of revolution of said armature.
References Cited (Backward Citations)
US3594599A
Cited
GB1277876A
Cited
US3567979A
Cited
US3939371A
Cited
FR2268377A1
Cited
US4110718A
Cited
US4112320A
Cited
US4237397A
Cited
US4383193A
Cited
US4469969A
Cited
US4471252A
Cited
EP0096868A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-18 | 1989-05-20 | 1989-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-18 | 1993-05-20 | 1993-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-18 | 1997-05-20 | 1997-11-19 | $7700.00 | Window Closed / Lapsed |