US4532448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flux director, tooth shield
Assignee: NSK Americas Inc
•
Filing: 1983-09-06
•
Granted: 1985-07-30
•
Expires: 2003-09-06
Abstract
Abstract A toothed, synchronous reluctance motor of the type having a motor made of laminations of magnetic material, has a plurality of laminations of conductive, non-magnetic material interspersed throughout the rotor to act as flux guides for radially collimating the magnetic flux passing through the rotor.
Inventors
- 👤 Ross D. Welburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:28
CPC Classifications
H; H02; H02K; H02K19/00; H02K19/02; H02K19/10; H02K19/103
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
148 words
An electric motor of the type having a plurality of opposed pairs of stator pole pieces, each stator pole piece having a plurality of projecting teeth, a rotor movably positioned between the stator pole piece pairs and having corresponding teeth opposing the stator pole teeth, the stator pole pieces and the rotor being made of laminae of magnetic material extending in a series of parallel planes perpendicular to the length of the rotor, separate electric coils encircling each stator pole piece, the coils of opposing stator pole pieces being connected in pairs and wound so as to generate magnetic fluxes of opposite polarity transversely through the rotor wherein the improvement comprises magnetic flux guide laminae of non-magnetic, electrically conductive material arranged parallel to and interspersed between the rotor laminae to guide the magnetic flux generated by the coils diametrically through the rotor in planes perpendicular to its length.
Claim 2
Dependent Claim
148 words
An electric motor of the type having a plurality of opposed pairs of stator pole pieces, each stator pole piece having a plurality of projecting teeth, a rotor movably positioned between the stator pole piece pairs and having corresponding teeth opposing the stator pole teeth, the stator pole pieces and the rotor being made of laminae of magnetic material extending in a series of parallel planes perpendicular to the length of the rotor, separate electric coils encircling each stator pole piece, the coils of opposing stator pole pieces being connected in pairs and wound so as to generate magnetic fluxes of opposite polarity transversely through the rotor wherein the improvement comprises magnetic flux guide laminae of non-magnetic, electrically conductive material arranged parallel to and interspersed between the rotor laminae to guide the magnetic flux generated by the coils diametrically through the rotor in planes perpendicular to its length.
Claim 3
Dependent Claim
25 words
An electric motor as recited in claim 1 wherein the magnetic flux guide laminae also have corresponding teeth which are aligned between the rotor teeth.
Claim 4
Dependent Claim
43 words
An electric motor as recited in claim 2 wherein the flux guide teeth are aligned with the valleys of the rotor teeth, whereby alternating polarity magnetic flux from the stator pole teeth will be repelled from the valley areas between the rotor teeth.
Claim 5
Dependent Claim
20 words
An electric motor as recited in claims 1 or 2 wherein the laminae and flux guide laminae are ring shaped.
Claim 6
Dependent Claim
20 words
An electric motor as recited in claim 4 wherein the rotor is rotatably mounted concentrically between the stator pole pieces.
Claim 7
Dependent Claim
17 words
An electric motor as recited in claim 1 wherein the motor is a toothed, synchronous, reluctance motor.
References Cited (Backward Citations)
US1551271A
Cited
US1653946A
Cited
US2107872A
Cited
US2402214A
Cited
US2897384A
Cited
US2929946A
Cited
US3163788A
Cited
US3426225A
Cited
US3751696A
Cited
US3956650A
Cited
US4110646A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |