Patent US3728598A successfully refreshed from Google Patents.
US3728598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bi-directional energizing circuit for a stepping motor with means to prevent conduction in one coil unit previously energized coil conduction is extinguished
Assignee: Superior Electric Co
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Filing: 1970-11-02
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Granted: 1973-04-17
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Expires: 1990-11-02
Abstract
Abstract A stepping motor having its stator windings connected into two phases is advanced one step by reversing the direction of current flow in one of the phases. Each phase is connected to a D.C. source by a pair of paths with each path directing current in a different direction through the phase. The paths are alternately shiftable from conducting to non-conducting with the shift of a path to being conducting being delayed until current flow from the path shifted to non-conducting is essentially zero to prevent short circuiting between the paths.
Inventors
- 👤 J May
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:40
CPC Classifications
H; H02; H02P; H02P8/00; H02P8/14; H02P8/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
204 words
An energizing circuit for a stepping motor having a plurality of windings with all the windings being connected into either a first phase or a second phase with a change in energization of one of the phases producing an incremental movement and in which each change consists of a reversal of current flow through a phase comprising a source of unidirectional current, pulse-tostep control means for providing signals to produce a change of energization and a bi-directional energizing means interconnected between the source and the phases to control current flow through the phases from the source under the direction of the pulse-tostep control means, said bi-directional energizing means having for eaCh phase a first path for directing current flow from the source through the phase in one direction and a second path for directing current flow from the source through the phase in the other direction, means for rendering each path conductive or nonconductive and means for preventing simultaneous operation of more than one path including means for delaying after receipt of a signal from the pulse-to-step control the initiation of a path from becoming conductive and means for initiating terminating the conduction in one path essentially simultaneously with the receipt of a signal.
Claim 2
Dependent Claim
204 words
An energizing circuit for a stepping motor having a plurality of windings with all the windings being connected into either a first phase or a second phase with a change in energization of one of the phases producing an incremental movement and in which each change consists of a reversal of current flow through a phase comprising a source of unidirectional current, pulse-tostep control means for providing signals to produce a change of energization and a bi-directional energizing means interconnected between the source and the phases to control current flow through the phases from the source under the direction of the pulse-tostep control means, said bi-directional energizing means having for eaCh phase a first path for directing current flow from the source through the phase in one direction and a second path for directing current flow from the source through the phase in the other direction, means for rendering each path conductive or nonconductive and means for preventing simultaneous operation of more than one path including means for delaying after receipt of a signal from the pulse-to-step control the initiation of a path from becoming conductive and means for initiating terminating the conduction in one path essentially simultaneously with the receipt of a signal.
Claim 3
Dependent Claim
57 words
The invention as defined in claim 1 in which each path includes a transistor having an inherent time delay in ceasing conduction upon initiation of termination so that current flows in one path after initiating termination of conduction for a short period and in which the means for delaying provides a time that approximates the short period.
Claim 4
Dependent Claim
95 words
The invention as defined in claim 1 in which the pulse-to-step control means has a pair of leads for each phase with the signal for a change of energization being a change in voltage levels on the leads, in which the means for rendering the paths conductive or non-conductive includes logic means in each path, there being one lead connected to one logic means and in which the logic means is responsive to only one voltage level on its lead to effect conduction and is responsive only to the other voltage level to effect non-conduction.
Claim 5
Dependent Claim
79 words
The invention as defined in claim 3 in which the logic means in each path includes a gate having a pair of inputs, in which the one lead is connected to the one input, in which the delaying means is operatively connected to the leads and has an output connected to each of the other gate inputs and in which the delaying means output is altered for a time period after a change of voltage levels on the leads.
Claim 6
Dependent Claim
59 words
The invention as defined in claim 1 in which the source has two leads with a switching means connected between the source and the phase to provide two switching means in each path and in which the means for rendering the paths conductive or non-conductive includes means for simultaneously identically altering the state of conduction of both switching means.
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |