US3660747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Step motor and control circuit therefor
Assignee: NCR Voyix Corp
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Filing: 1970-08-27
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Granted: 1972-05-02
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Expires: 1990-08-27
Abstract
Abstract A step motor has three phase windings and is operated with one phase winding continuously energized and the other phase windings alternately energized, each to select one of two possible step positions. The three phase windings separately develop flux between pole portions of the stator and a rotor responsive to the magnetic flux in the stator pole portions moves between two positions of least reluctance as the second and third windings are alternately energized. By means of associated control circuits, each of the second and third windings, when deenergized, is permitted to dissipate its back e.m.f. through the first winding to momentarily increase the magnetic flux developed with said first winding. Accurate step positioning without overshoot and without detent means is achieved by a timed interruption in the energization of whichever of the second and third windings is initiating a shift in the rotor position, the arrangement of stator windings being such that upon reenergization of the step initiating phase the flux developed by the step initiating phase will operate to arrest rotor movement.
Inventors
- 👤 Clifford W Kruer
- 👤 John R Frazier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:54
CPC Classifications
H; H02; H02K; H02K37/00; H02K37/10; H02K37/12; H02K37/14; H02P; H02P25/00; H02P25/02; H02P25/08; H02P8/00; H02P8/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
180 words
An apparatus to position a movable magnetic member to first and second positions in response to first and second signals, respectively, comprising: first, second, and third flux-producing means; said first flux-producing means biasing said magnetic member to an intermediate position between said first and second positions; and control means, in response to said first signal, deenergizing the third flux-producing means and simultaneously energizing the second flux-producing means sufficiently long to enable said member to move past said intermediate position and to arrive at said first position with substantially no kinetic energy, and thereafter energizing said second flux-producing means, enabling said first and second flux-producing means to hold said member at said first position; said control means, in response to said second signal, deenergizing said second flux-producing means and simultaneously energizing the third flux-producing means sufficiently long to enable said member to move past said intermediate position and to arrive at said second position with substantially no kinetic energy, and thereafter, energizing said third flux-producing means, enabling said first and third flux-producing means to hold said member at said second position.
Claim 2
Independent Claim
180 words
An apparatus to position a movable magnetic member to first and second positions in response to first and second signals, respectively, comprising: first, second, and third flux-producing means; said first flux-producing means biasing said magnetic member to an intermediate position between said first and second positions; and control means, in response to said first signal, deenergizing the third flux-producing means and simultaneously energizing the second flux-producing means sufficiently long to enable said member to move past said intermediate position and to arrive at said first position with substantially no kinetic energy, and thereafter energizing said second flux-producing means, enabling said first and second flux-producing means to hold said member at said first position; said control means, in response to said second signal, deenergizing said second flux-producing means and simultaneously energizing the third flux-producing means sufficiently long to enable said member to move past said intermediate position and to arrive at said second position with substantially no kinetic energy, and thereafter, energizing said third flux-producing means, enabling said first and third flux-producing means to hold said member at said second position.
Claim 3
Dependent Claim
47 words
The apparatus as claimed in claim 1 in which said control means further include circuit means for transferring to said first flux-producing means the e.m.f. which is produced each time said second and third flux-producing means are deenergized, thereby increasing the strength of said first flux-producing means.
Claim 4
Dependent Claim
208 words
A two-position stepping motor comprising: a rotor of magnetically permeable material having a plurality of radially extending poles distributed around the axis thereof; a stator of magnetically permeable material surrounding said rotor and having a plurality of poles extending radially toward the axis of said rotor and distributed about the axis of said rotor; first, second, and third winding circuits on said stator; and control means comprising: means to continuously energize said first winding circuit to radially align one of the rotor poles with one of the stator poles to provide a magnetic potential well; and a control circuit to step said rotor to first and second positions on opposite sides of said well; said contrOl circuit, in response to a first signal, deenergizing said third winding circuit and simultaneously energizing said second winding circuit for a short duration, and thereafter reenergizing said second winding circuit at a time when the rotor has substantially zero kinetic energy at said first position; said control circuit, in response to a second signal, deenergizing said second winding circuit and simultaneously energizing said third winding circuit for a short duration, and thereafter reenergizing said third winding circuit at a time when the rotor has substantially zero kinetic energy at said second position.
Claim 5
Dependent Claim
208 words
A two-position stepping motor comprising: a rotor of magnetically permeable material having a plurality of radially extending poles distributed around the axis thereof; a stator of magnetically permeable material surrounding said rotor and having a plurality of poles extending radially toward the axis of said rotor and distributed about the axis of said rotor; first, second, and third winding circuits on said stator; and control means comprising: means to continuously energize said first winding circuit to radially align one of the rotor poles with one of the stator poles to provide a magnetic potential well; and a control circuit to step said rotor to first and second positions on opposite sides of said well; said contrOl circuit, in response to a first signal, deenergizing said third winding circuit and simultaneously energizing said second winding circuit for a short duration, and thereafter reenergizing said second winding circuit at a time when the rotor has substantially zero kinetic energy at said first position; said control circuit, in response to a second signal, deenergizing said second winding circuit and simultaneously energizing said third winding circuit for a short duration, and thereafter reenergizing said third winding circuit at a time when the rotor has substantially zero kinetic energy at said second position.
Claim 6
Dependent Claim
293 words
A two-position stepping motor comprising: a rotor of magnetically permeable material having a plurality of radially extending poles distributed around the axis thereof; a stator of magnetically permeable material surrounding said rotor and having a plurality of poles extending radially toward the axis of said rotor and distributed about the axis of said rotor; first, second, and third winding circuits on said stator; and control means for controlling the rotation of the rotor to first and second positions; said control means including: means to continuously energize said first winding circuit; a control circuit responsive to first and second position change signals for controlling the energization of said second and third winding circuits to rotate said rotor to said first and second positions in response to a first change signal; said control circuit, in response to said first change signal, deenergizing said third winding circuit and simultaneously momentarily energizing said second winding circuit to enable it to assist said first winding circuit in moving said rotor to said first position, where said rotor has substantially zero kinetic energy; and thereafter reenergizing said second winding circuit, enabling said first and second winding circuits to catch and hold said rotor in said first position at a time when said rotor is without kinetic energy; said control circuit, in response to said second change signal, deenergizing said second winding circuit and simultaneously momentarily energizing said third winding circuit to enable it to assist said first winding circuit in moving said rotor to said second position, where said rotor has substantially zero kinetic energy; and thereafter reenergizing said third winding circuit, enabling said first and third winding circuits to catch and hold said rotor in said second position at a time when said rotor is without kinetic energy.
Claim 7
Dependent Claim
293 words
A two-position stepping motor comprising: a rotor of magnetically permeable material having a plurality of radially extending poles distributed around the axis thereof; a stator of magnetically permeable material surrounding said rotor and having a plurality of poles extending radially toward the axis of said rotor and distributed about the axis of said rotor; first, second, and third winding circuits on said stator; and control means for controlling the rotation of the rotor to first and second positions; said control means including: means to continuously energize said first winding circuit; a control circuit responsive to first and second position change signals for controlling the energization of said second and third winding circuits to rotate said rotor to said first and second positions in response to a first change signal; said control circuit, in response to said first change signal, deenergizing said third winding circuit and simultaneously momentarily energizing said second winding circuit to enable it to assist said first winding circuit in moving said rotor to said first position, where said rotor has substantially zero kinetic energy; and thereafter reenergizing said second winding circuit, enabling said first and second winding circuits to catch and hold said rotor in said first position at a time when said rotor is without kinetic energy; said control circuit, in response to said second change signal, deenergizing said second winding circuit and simultaneously momentarily energizing said third winding circuit to enable it to assist said first winding circuit in moving said rotor to said second position, where said rotor has substantially zero kinetic energy; and thereafter reenergizing said third winding circuit, enabling said first and third winding circuits to catch and hold said rotor in said second position at a time when said rotor is without kinetic energy.
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |