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Patent US3665284A successfully refreshed from Google Patents.
US3665284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply for a stepping motor dependent upon voltage level and pulsing rate
Assignee: Superior Electric Co
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Filing: 1970-07-20
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Granted: 1972-05-23
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Expires: 1990-07-20
Abstract
Abstract A power circuit for supplying power from an A.C. source to a D.C. energized variable speed stepping motor to increase the torque at high speeds and the maximum stepping speed of the motor with the speed of the motor being regulated by a control circuit to be independent of the voltage supplied thereto, by adjusting the value of the voltage from the A.C. source to the motor substantially inversely to the value of the current drawn by the motor during a relatively low range of speeds and by providing a substantially constant voltage of a higher value at high stepping speeds with the high constant voltage source being made operative from information that both the motor speed is above a predetermined value and the motor voltage exceeds a predetermined value.
Inventors
- 👤 Robert J Loyzim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:01
CPC Classifications
H; H02; H02P; H02P8/00; H02P8/14; H02P8/16; H02P8/165
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
218 words
In combination with a digital stepping motor of the type having stator windings that produce an incremental movement for each change of energization of at least some of the windings by unidirectional current, a control circuit having an output connected to the windings to provide a change of energization upon receipt of a command pulse, command pulse supplying means for providing command pulses at a rate that determines the operating speed of the motor with the rate being variable from none to a relatively high value, power means having output terminals connected to the control circuit to provide the unidirectional output power that the control circuit supplies to the stator windings and a first power circuit in the power means having means for providing a voltage to the output terminals of the power means that varies substantially inversely with the value of current flow through the windings, the improvement comprising a second power circuit in the power means for providing a substantially constant value of voltage to the output terminals and means for activating said second power circuit only when a selected value of voltage is produced by the first power circuit, said constant voltage being of a higher value then said selected value and simultaneously therewith when the rate of the command pulses exceeds a preselected value.
Claim 2
Dependent Claim
218 words
In combination with a digital stepping motor of the type having stator windings that produce an incremental movement for each change of energization of at least some of the windings by unidirectional current, a control circuit having an output connected to the windings to provide a change of energization upon receipt of a command pulse, command pulse supplying means for providing command pulses at a rate that determines the operating speed of the motor with the rate being variable from none to a relatively high value, power means having output terminals connected to the control circuit to provide the unidirectional output power that the control circuit supplies to the stator windings and a first power circuit in the power means having means for providing a voltage to the output terminals of the power means that varies substantially inversely with the value of current flow through the windings, the improvement comprising a second power circuit in the power means for providing a substantially constant value of voltage to the output terminals and means for activating said second power circuit only when a selected value of voltage is produced by the first power circuit, said constant voltage being of a higher value then said selected value and simultaneously therewith when the rate of the command pulses exceeds a preselected value.
Claim 3
Dependent Claim
47 words
The invention as defined in claim 1 in which the rate of the command pulses to the motor has a high rate range and a lower rate range and in which the second power circuit is only operated at the high rate range of the command pulses.
Claim 4
Dependent Claim
43 words
The invention as defined in claim 1 in which the power means includes a third power circuit for providing a constant value of voltage to the motor, said voltage being the minimum value of voltage applied to the motor by the power means.
Claim 5
Dependent Claim
271 words
In combination with a digital stepping motor of the type having stator windings that produce an incremental movement for each change of energization of at least some of the windings by unidirectional current, a control circuit having an output connected to the windings to provide a change of energization upon receipt of a command pulse, command pulse supplying means for providing command pulses at a rate that determines the operating speed of the motor with the rate being variable from none to a relatively high value, power means having output terminals connected to the control circuit to provide the unidirectional output power that the control circuit supplies to the stator windings and a first power circuit in the power means having means for providing a voltage to the output terminals of the power means that varies substantially inversely with the value of current flow through the windings, the improvement comprising a second power circuit in the power means for providing a substantially constant value of voltage to the output terminals and means for activaTing said second power circuit when a selected value of voltage is produced by the first power circuit, said constant voltage being of a higher value then said selected value, in which the power means has input terminals connectible to an A.C. source, and rectifying means, the first power circuit includes an inductance means connected between the input terminals and the rectifying means for varying the voltage from the power means and in which there are means effective upon the actuation of the second power circuit to nullify the effect of the inductance means to vary the voltage.
Claim 6
Dependent Claim
271 words
In combination with a digital stepping motor of the type having stator windings that produce an incremental movement for each change of energization of at least some of the windings by unidirectional current, a control circuit having an output connected to the windings to provide a change of energization upon receipt of a command pulse, command pulse supplying means for providing command pulses at a rate that determines the operating speed of the motor with the rate being variable from none to a relatively high value, power means having output terminals connected to the control circuit to provide the unidirectional output power that the control circuit supplies to the stator windings and a first power circuit in the power means having means for providing a voltage to the output terminals of the power means that varies substantially inversely with the value of current flow through the windings, the improvement comprising a second power circuit in the power means for providing a substantially constant value of voltage to the output terminals and means for activaTing said second power circuit when a selected value of voltage is produced by the first power circuit, said constant voltage being of a higher value then said selected value, in which the power means has input terminals connectible to an A.C. source, and rectifying means, the first power circuit includes an inductance means connected between the input terminals and the rectifying means for varying the voltage from the power means and in which there are means effective upon the actuation of the second power circuit to nullify the effect of the inductance means to vary the voltage.
Claim 7
Dependent Claim
34 words
The invention as defined in claim 4 in which the nullifying means includes a condenser connected between the input terminals and the rectifying means for forming a series resonant circuit with the inductance means.
Claim 8
Dependent Claim
46 words
The invention as defined in claim 4 in which nullifying means includes a winding in the inductance means and in which the second power circuit when actuated provides a voltage to the winding to transform the inductance means into a transformer to provide a boosting voltage.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |