US4445077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive circuit for step motor
Assignee: Tekade Felten and Guilleaume Fernmeldeanlagen GmbH
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Filing: 1982-01-25
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Granted: 1984-04-24
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Expires: 2002-01-25
Abstract
Abstract A drive circuit for a step motor, where the stator windings of the step motor are in each case connected in series to a diode and where a capacitor is connected in parallel to the series of diode and winding. The above element is provided with power from a d.c. source via a thyristor switch. The circuit provides that upon firing of a thyristor the previously current conducting thyristor is switched off. Thus step motors can reliably be operated, where up to the switching to another winding still a holding current is to flow.
Inventors
- 👤 Klaus P. Kirschner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:51
CPC Classifications
H; H02; H02P; H02P8/00; H02P8/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
101 words
A drive circuit for a step motor comprising a constant current power supply; stator windings of the step motor; diodes each connected in series to a corresponding winding; capacitors each connected in parallel to a corresponding series of a diode connected to the winding and also connected on one side to one terminal of the constant current power supply; thyristors each connected to a corresponding capacitor on the side not connected to the constant current power supply and connected to the second terminal of the constant current power supply; and a control device connected to the gate inputs of the thyristors.
Claim 2
Dependent Claim
101 words
A drive circuit for a step motor comprising a constant current power supply; stator windings of the step motor; diodes each connected in series to a corresponding winding; capacitors each connected in parallel to a corresponding series of a diode connected to the winding and also connected on one side to one terminal of the constant current power supply; thyristors each connected to a corresponding capacitor on the side not connected to the constant current power supply and connected to the second terminal of the constant current power supply; and a control device connected to the gate inputs of the thyristors.
Claim 3
Dependent Claim
25 words
The drive circuit for a step motor according to claim 1 further comprising a surge protector connected in parallel to the constant current power supply.
Claim 4
Independent Claim
85 words
A method for providing power to a step motor comprising charging a capacitor; energizing a winding connected in series to a diode with the series connection of the diode and the winding being in parallel to the capacitor; interrupting the current flow by instituting a corresponding cycle at a second winding; and charging with reverse polarity the capacitor with the energy remaining in the switched off winding and preventing current flow in the opposite direction by connecting a diode in series to the corresponding winding.
Claim 5
Independent Claim
85 words
A method for providing power to a step motor comprising charging a capacitor; energizing a winding connected in series to a diode with the series connection of the diode and the winding being in parallel to the capacitor; interrupting the current flow by instituting a corresponding cycle at a second winding; and charging with reverse polarity the capacitor with the energy remaining in the switched off winding and preventing current flow in the opposite direction by connecting a diode in series to the corresponding winding.
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) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |