Patent US3553508A successfully refreshed from Google Patents.
US3553508A
Expired / Lapsed
US
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Electric motor with a plurality of radially arranged bridge-type magnetic circuits
Assignee: RECH EN MATIERE DE MICRO MOTEU
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Filing: 1969-03-12
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Granted: 1971-01-05
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Expires: 1989-03-12
Abstract
Abstract A plurality of pairs of radially disposed magnetically permeable plates with included permanent magnets disposed therebetween with the plates including cutout portions providing an annular volume for housing at least one electrical coil and which cutout portions also divide each pair of plates into at least first and second sets of tooth-shaped stator or field poles for bridge-type magnetic circuits in an electric motor. A concentrically disposed rotor is also provided with at least first and second sets of tooth-shaped rotor poles angularly phased to cooperate and magnetically couple with the sets of stator poles thus completing bridge-type magnetic circuits within the motor.
Inventors
- 👤 Georges Stcherbatcheff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:48
CPC Classifications
G; G04; G04C; G04C3/00; G04C3/16; H; H02; H02K; H02K21/00; H02K21/38; H02K21/44; H02K37/00; H02K37/10; H02K37/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
218 words
An improved electric motor having bridge-type magnetic circuits, said motor comprising: an elongated armature formed of a magnetically permeable material and disposed for rotation about an axis; said elongated armature including at least first and second sets of axially spaced-apart salient rotor poles; a stationary field structure disposed about said armature including; a plurality of pairs of magnetically permeable plates radially disposed about said axis; a permanent magnet disposed between each of said pairs of plates for causing one of each of said pair of plates to have a magnetic polarity opposite that of the other; at least one cutout portion in each of said plates for defining salient stator poles with the remaining uncut portions; first and third sets of said stator poles axially spaced to one side of said cutout portion in substantial phase opposition and disposed for magnetically coupling with said first set of spaced rotor poles; second and fourth sets of stator poles axially spaced to the other side of said cutout portions in substantial phase opposition and disposed for magnetically coupling with said second set of spaced rotor poles, said first and second sets of stator poles being substantially in phase opposition; and an energizing electrical coil disposed concentrically about said armature and substantially within an annular volume defined by said cutout portions.
Claim 2
Dependent Claim
218 words
An improved electric motor having bridge-type magnetic circuits, said motor comprising: an elongated armature formed of a magnetically permeable material and disposed for rotation about an axis; said elongated armature including at least first and second sets of axially spaced-apart salient rotor poles; a stationary field structure disposed about said armature including; a plurality of pairs of magnetically permeable plates radially disposed about said axis; a permanent magnet disposed between each of said pairs of plates for causing one of each of said pair of plates to have a magnetic polarity opposite that of the other; at least one cutout portion in each of said plates for defining salient stator poles with the remaining uncut portions; first and third sets of said stator poles axially spaced to one side of said cutout portion in substantial phase opposition and disposed for magnetically coupling with said first set of spaced rotor poles; second and fourth sets of stator poles axially spaced to the other side of said cutout portions in substantial phase opposition and disposed for magnetically coupling with said second set of spaced rotor poles, said first and second sets of stator poles being substantially in phase opposition; and an energizing electrical coil disposed concentrically about said armature and substantially within an annular volume defined by said cutout portions.
Claim 3
Dependent Claim
31 words
An improved electric motor as in claim 1, wherein said motor includes: a casing with two end supports having shoulders therein; and said plates having terminal edges resting on said shoulders.
Claim 4
Dependent Claim
45 words
An improved motor as in claim 1, wherein the said armature includes at least one further set of rotor poles, the number of poles of said further set being twice the number of poles in each of said first and second sets of rotor poles.
Claim 5
Dependent Claim
90 words
An improved electric motor as in claim 1, wherein said motor is a polyphase motor having: at least two spaced-apart energizing coils coaxially disposed with respect to said armature; said pairs of plates further forming fifth and sixth sets of salient stator poles axially spaced from other stator poles and in substantial phase opposition; and said armature further including a third set of rotor poles axially spaced from said first and second sets of rotor poles and disposed for magnetically coupling with said fifth and sixth sets of stator poles.
Claim 6
Dependent Claim
25 words
An improved electric motor as in claim 1, wherein the number of said plurality of pairs of magnetically permeable plates is evenly divisible by four.
Claim 7
Dependent Claim
35 words
An improved electric motor as in claim 5, wherein said pairs of plates are symmetrically disposed about the said axis to provide a repetition symmetry of the order of four or a multiple of four.
Claim 8
Dependent Claim
89 words
An improved stator structure for an electric motor having bridge-type magnetic circuits, said stator sTructure comprising: a plurality of pairs of magnetically permeable plates radially disposed about an axis; a permanent magnet disposed between each of said pairs of plates for causing one of each of said pair of plates to have a polarity opposite that of the other; and at least one cutout portion in each of said plates for defining an annular electrical coil housing volume and for defining salient stator poles with the remaining uncut portions.
Claim 9
Dependent Claim
89 words
An improved stator structure for an electric motor having bridge-type magnetic circuits, said stator sTructure comprising: a plurality of pairs of magnetically permeable plates radially disposed about an axis; a permanent magnet disposed between each of said pairs of plates for causing one of each of said pair of plates to have a polarity opposite that of the other; and at least one cutout portion in each of said plates for defining an annular electrical coil housing volume and for defining salient stator poles with the remaining uncut portions.
Claim 10
Dependent Claim
29 words
An improved stator structure as in claim 7, including: a casing with two end supports having shoulders therein; and wherein said plates have terminal edges resting on said shoulders.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |