Patent US3755701A successfully refreshed from Google Patents.
US3755701A
Expired / Lapsed
US
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Selectively reversible step motor
Assignee: Motors Liquidation Co
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Filing: 1972-09-14
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Granted: 1973-08-28
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Expires: 1992-09-14
Abstract
Abstract A selectively reversible step motor. Two field pole pieces, each having a plurality of circumferentially arranged salient field pole tips, are positioned on respective opposite sides of a toroidal field coil with the salient field pole tips being interleaved and extending in the same direction substantially parallel to the axis of and beyond an edge of the field coil to define a cylinder-like recess. A disk type rotor, having a series of premagnetized alternate polarity magnetic rotor poles about the periphery thereof, is mounted for rotation within the cylinder-like recess and an auxiliary direction of rotation selecting pole piece, having a plurality of circumferentially arranged salient pole tips equal in number to the total of salient field pole tips, is mounted for rotation about the axis of the rotor with the salient pole pieces thereof interleaved between adjacent salient field pole tips of the field pole pieces for selectively determining the direction of rotor rotation.
Inventors
- 👤 M Culver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:44
CPC Classifications
H; H02; H02K; H02K37/00; H02K37/10; H02K37/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
187 words
A selectively reversible step motor comprising: a field coil of a plurality of electrical conductor turns around a common axis arranged to be energized by an external source of direct current potential for producing magnetic flux; first and second groups of a plurality of field pole tips in magnetic coupling relationship with respective opposite sides of said field coil and interleaved for producing a series of circumferentially spaced alternate polarity magnetic field poles upon each energization of said field coil; a disk type rotor having a series of circumferentially spaced premagnetized alternate polarity magnetic rotor poles of a number equal to the number of said field pole tips mounted for rotation with said rotor poles closely adjacent said field pole tips whereby said rotor is rotated upon each energization of said field coil; and an auxiliary pole piece of magnetic material having a plurality of pole tips, equal in number to the total of said field pole tips, mounted for rotation about the axis of said rotor with said pole tips thereof interleaved between adjacent said field pole tips for selectively determining the direction of rotor rotation.
Claim 2
Dependent Claim
187 words
A selectively reversible step motor comprising: a field coil of a plurality of electrical conductor turns around a common axis arranged to be energized by an external source of direct current potential for producing magnetic flux; first and second groups of a plurality of field pole tips in magnetic coupling relationship with respective opposite sides of said field coil and interleaved for producing a series of circumferentially spaced alternate polarity magnetic field poles upon each energization of said field coil; a disk type rotor having a series of circumferentially spaced premagnetized alternate polarity magnetic rotor poles of a number equal to the number of said field pole tips mounted for rotation with said rotor poles closely adjacent said field pole tips whereby said rotor is rotated upon each energization of said field coil; and an auxiliary pole piece of magnetic material having a plurality of pole tips, equal in number to the total of said field pole tips, mounted for rotation about the axis of said rotor with said pole tips thereof interleaved between adjacent said field pole tips for selectively determining the direction of rotor rotation.
Claim 3
Dependent Claim
268 words
A selectively reversible step motor comprising: a field coil of a plurality of electrical conductor turns around a common axis arranged to be energized by an external source of direct current potential for producing magnetic flux; first and second field pole pieces of magnetic material having a plurality of circumferentially arranged salient field pole tips, the said salient field pole tips of one of said pole pieces being longer than and equal in number to said salient pole tips of the other, positioned on respective opposite sides of said field coil with said salient field pole tips being interleaved and extending in the same direction substantially parallel to the axis of and beyond an edge of said field coil to define a cylinder-like recess for producing a series of circumferentially spaced alternate polarity magnetic field poles upon each energization of said field coil; a disk type rotor having a series of radially premagnetized alternate polarity magnetic rotor poles of a number equal to the number of said salient field pole tips circumferentially spaced about the periphery thereof mounted for rotation within said cylinder-like recess with said rotor poles closely adjacent said salient field pole tips; and an auxiliary pole piece of magnetic material having a plurality of circumferentially arranged salient pole tips, equal in number to the total of said salient field pole tips of said first and second field pole pieces, mounted for rotation about the axis of said rotor with said salient pole tips thereof interleaved between adjacent said salient field pole tips of said field pole pieces for selectively determining the direction of rotor rotation.
Claim 4
Dependent Claim
268 words
A selectively reversible step motor comprising: a field coil of a plurality of electrical conductor turns around a common axis arranged to be energized by an external source of direct current potential for producing magnetic flux; first and second field pole pieces of magnetic material having a plurality of circumferentially arranged salient field pole tips, the said salient field pole tips of one of said pole pieces being longer than and equal in number to said salient pole tips of the other, positioned on respective opposite sides of said field coil with said salient field pole tips being interleaved and extending in the same direction substantially parallel to the axis of and beyond an edge of said field coil to define a cylinder-like recess for producing a series of circumferentially spaced alternate polarity magnetic field poles upon each energization of said field coil; a disk type rotor having a series of radially premagnetized alternate polarity magnetic rotor poles of a number equal to the number of said salient field pole tips circumferentially spaced about the periphery thereof mounted for rotation within said cylinder-like recess with said rotor poles closely adjacent said salient field pole tips; and an auxiliary pole piece of magnetic material having a plurality of circumferentially arranged salient pole tips, equal in number to the total of said salient field pole tips of said first and second field pole pieces, mounted for rotation about the axis of said rotor with said salient pole tips thereof interleaved between adjacent said salient field pole tips of said field pole pieces for selectively determining the direction of rotor rotation.
Claim 5
Dependent Claim
294 words
A selectively reversible step motor comprising: a field coil of a plurality of electrical conductor turns around a common axis arranged to be energized by an external source of direct current potential for producing magnetic flux; first and second field pole pieces of magnetic material comprised of a circular body portion having a plurality of salient field pole tips extending from the periphery thereof and substantially normal thereto, the said salient field pole tips of one of said pole pieces being longer than and equal in number to said salient field pole tips of the other, positioned on respective opposite sides of said field coil with said salient field pole tips being interleaved and extending in the same direction substantially parallel to the axis of and beyond an edge of said field coil to define a cylinder-like recess for producing a sEries of circumferentially spaced alternate polarity magnetic field poles upon each energization of said field coil; a disk type rotor having a series of radially premagnetized alternate polarity magnetic rotor poles of a number equal to the number of said salient field pole tips circumferentially spaced about the periphery thereof mounted for rotation within said cylinder-like recess with said rotor poles closely adjacent said salient pole tips; and an auxiliary pole piece of magnetic material comprised of a circular body portion having a plurality of salient pole tips, equal in number to the total of said salient field pole tips of said first and second field pole pieces, extending from the periphery thereof and substantially normal thereto mounted for rotation about the axis of said rotor with said salient pole tips thereof interleaved between adjacent said salient field pole tips of said field pole pieces for selectively determining the direction of rotor rotation.
Claim 6
Dependent Claim
294 words
A selectively reversible step motor comprising: a field coil of a plurality of electrical conductor turns around a common axis arranged to be energized by an external source of direct current potential for producing magnetic flux; first and second field pole pieces of magnetic material comprised of a circular body portion having a plurality of salient field pole tips extending from the periphery thereof and substantially normal thereto, the said salient field pole tips of one of said pole pieces being longer than and equal in number to said salient field pole tips of the other, positioned on respective opposite sides of said field coil with said salient field pole tips being interleaved and extending in the same direction substantially parallel to the axis of and beyond an edge of said field coil to define a cylinder-like recess for producing a sEries of circumferentially spaced alternate polarity magnetic field poles upon each energization of said field coil; a disk type rotor having a series of radially premagnetized alternate polarity magnetic rotor poles of a number equal to the number of said salient field pole tips circumferentially spaced about the periphery thereof mounted for rotation within said cylinder-like recess with said rotor poles closely adjacent said salient pole tips; and an auxiliary pole piece of magnetic material comprised of a circular body portion having a plurality of salient pole tips, equal in number to the total of said salient field pole tips of said first and second field pole pieces, extending from the periphery thereof and substantially normal thereto mounted for rotation about the axis of said rotor with said salient pole tips thereof interleaved between adjacent said salient field pole tips of said field pole pieces for selectively determining the direction of rotor rotation.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |