Patent US3906268A successfully refreshed from Google Patents.
US3906268A
Expired / Lapsed
US
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High density flux magnetic circuit
Assignee: Kollmorgen Corp
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Filing: 1974-04-08
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Granted: 1975-09-16
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Expires: 1994-04-08
Abstract
Abstract Magnetic means and circuits for efficiently conducting and directing flux to a flux emergent surface, such as the pole of a motor pole piece, in which flux produced by two or more permanent magnetic sources matched in reluctance to a working air gap is directed through surfaces of a volume of magnetically permeable material sugnificantly greater in area than the area of the working air gap, with the flux from at least two sources having a vector component perpendicular to the average direction of the resultant flux across the working air gap.
Inventors
- 👤 Graffenried Albert L De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:25
CPC Classifications
H; H02; H02K; H02K23/00; H02K23/02; H02K23/04; H01; H01F; H01F7/00; H01F7/02; H01F7/0273; H01F7/0278
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
135 words
A high flux electric motor, comprising: a rotor; at least one pair of polygonal pole pieces of magnetically permeable material each having at least four sides and a working air gap surface adjacent the rotor, at least two of said sides being disposed generally opposite the air gap surface and being related by an obtuse internal angle; a magnetomotive source covering each of the sides of said pole pieces, each said source associated with a respective pole piece being similarly poled and having a magnetic axis generally normal to the surface of the pole piece side covered thereby so as to oppositely pole the respective air gap surfaces; and a ferromagnetic motor casing contacting the magnetomotive sources and completing a magnetic flux circuit for each source through the pair of pole pieces and the rotor.
Claim 2
Dependent Claim
135 words
A high flux electric motor, comprising: a rotor; at least one pair of polygonal pole pieces of magnetically permeable material each having at least four sides and a working air gap surface adjacent the rotor, at least two of said sides being disposed generally opposite the air gap surface and being related by an obtuse internal angle; a magnetomotive source covering each of the sides of said pole pieces, each said source associated with a respective pole piece being similarly poled and having a magnetic axis generally normal to the surface of the pole piece side covered thereby so as to oppositely pole the respective air gap surfaces; and a ferromagnetic motor casing contacting the magnetomotive sources and completing a magnetic flux circuit for each source through the pair of pole pieces and the rotor.
Claim 3
Dependent Claim
33 words
The high flux electric motor of claim 1, wherein: the area of the pole piece sides covered by the magnetomotive sources is at least 1.5 times the area of the air gap surface.
Claim 4
Dependent Claim
52 words
The high flux electric motor of claim 2, wherein: each pole piece has four sides including a pair of sides converging toward the air gap from said two sides opposite the air gap, and each of said convergent sides forming an acute internal angle with a respective one of said two sides.
Claim 5
Dependent Claim
117 words
The high flux electric motor of claim 3, further comprising: at least one additional pair of pole pieces of magnetically permeable material each configured substantially identically to said first pair of pole pieces; a magnetomotive source covering each side of the additional pair of pole pieces, each source being similarly poled and having magnetic axes generally normal to the pole piece sides covered thereby so as to oppositely pole the respective air gap surfaces of the additional pole pieces; the ferromagnetic motor casing contacting the magnetomotive sources associated with the additional pair of pole pieces so as to complete a magnetic flux circuit for each such source through the additional pair of pole pieces and the rotor.
Claim 6
Dependent Claim
26 words
The high flux electric motor of claim 2, wherein: each of the adjacent sides of the polygonal pole pieces is related by an obtuse internal angle.
Claim 7
Dependent Claim
36 words
The high flux electric motor of claim 2, wherein: each of the sides of the pole pieces is relatively narrow so as to form essentially a continuously curved pole piece surface everwhere covered by magnetomotive sources.
Claim 8
Dependent Claim
25 words
The high flux motor of claim 6, wherein each pole piece has a generally cylindrical exterioR with a portion thereof constituting the air gap surface.
Claim 9
Dependent Claim
27 words
The high flux motor of claim 7, wherein each pole piece has a generally elliptical cross-section having a minor axis generally perpendicular to the air gap surface.
Claim 10
Dependent Claim
31 words
The high flux electric motor of claim 2, wherein: each of the magnetomotive sources comprises a permanent magnet having a magnetic axis generally normal to the pole piece surface covered thereby.
Claim 11
Dependent Claim
34 words
The high flux electric motor of claim 9, wherein: each of said permanent magnets has a magnetic reluctance approximating the reluctance of the magnetic load for the flux supplied thereby to the magnetic circuit.
References Cited (Backward Citations)
US3334254A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |