US4683409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilizing arrangement for a stepping motor
Assignee: Sodeco Saia AG
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Filing: 1986-04-21
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Granted: 1987-07-28
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Expires: 2006-04-21
Abstract
Abstract A pulse-width modulator is used to control the sequence generator of a stepping motor to stabilize the stepping motor. One input to the pulse-width modulator is a cyclic sequence of pulses. The other input to the pulse-width modulator is an error-correction signal. The error-correction signal is proportional to variations about an average of the sum of the currents produced by the sequence generator. The error-correction signal is used by the pulse-width modulator to modulate the duration of individual pulses in the cycle sequence of pulses to produce a sequence of pulses of variable duration. The pulses of variable duration serve to control the sequence generator and stabilize the stepping motor.
Inventors
- 👤 Pierre Boillat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:32
CPC Classifications
H; H02; H02P; H02P8/00; H02P8/14; H02P8/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
176 words
A stabilizing arrangement for a stepping motor comprising: a pulse-width modulator for modulating control pulses of said stepping motor, said pulse-width modulator receiving an error correction signal as one input and the output of a cycle generator as the other input, said error correction signal being generated by a current sensor by way of a low pass filter and a high pass filter, said pulse-width modulator comprising a controllable saw-tooth generator and a comparator connected to the output of the saw-tooth generator for comparing the saw-tooth signal produced by the saw-tooth generator with the error-correction signal, said saw-tooth generator comprising a capacitor, a controllable switch, connected in parallel to said capacitor, a controllable current source connected in series to said capacitor, and a control device, the input of the control device being connected to said capacitor and the output of said control device being connected to a control input of the controllable current source by way of a diode, a control input of said controllable switch being connected to an input of the controllable saw-tooth generator.
Claim 2
Dependent Claim
176 words
A stabilizing arrangement for a stepping motor comprising: a pulse-width modulator for modulating control pulses of said stepping motor, said pulse-width modulator receiving an error correction signal as one input and the output of a cycle generator as the other input, said error correction signal being generated by a current sensor by way of a low pass filter and a high pass filter, said pulse-width modulator comprising a controllable saw-tooth generator and a comparator connected to the output of the saw-tooth generator for comparing the saw-tooth signal produced by the saw-tooth generator with the error-correction signal, said saw-tooth generator comprising a capacitor, a controllable switch, connected in parallel to said capacitor, a controllable current source connected in series to said capacitor, and a control device, the input of the control device being connected to said capacitor and the output of said control device being connected to a control input of the controllable current source by way of a diode, a control input of said controllable switch being connected to an input of the controllable saw-tooth generator.
Claim 3
Dependent Claim
26 words
An arrangement in accordance with claim 1 that is characterized by the control device comprising an impedance transformer, another low pass filter and a control amplifier.
Claim 4
Dependent Claim
18 words
An arrangement in accordance with claim 2 that is characterized by the impedance transformer being an emitter follower.
Claim 5
Dependent Claim
27 words
An arrangement in accordance with claim 2 that is characterized by the control amplifier being constructed with an operational amplifier that is arranged as an inverting amplifier.
Claim 6
Dependent Claim
33 words
An arrangement in accordance with claim 1 that is characterized by the input of the controllable saw-tooth generator being connected to the control input of the controllable switch over at least one attenuating.
Claim 7
Dependent Claim
44 words
An arrangement in accordance with claim 5 that is characterized by the input of the controllable saw-tooth generator being connected to the control input of the controllable switch, and to the input of the attenuating element by way of at least one mono-stable multivibrator.
Claim 8
Dependent Claim
30 words
An arrangement in accordance with claim 1 characterized by a logic circuit being connected at the outlet of said comparator, said logic circuit also being fed by a cycle signal.
Claim 9
Dependent Claim
116 words
An arrangement in accordance with claim 1 that is characterized by a logic circuit being connected to the output of said comparator, the logic circuit comprising a RS-flip flop and an output logic circuit, the output of said RS-flip flop being connected to a first input of the output logic circuit by way of an inverter, while the output of the comparator is connected on one hand to a first input of the RS-flip flop over another inverter and on the other hand to a second input of the output logic circuit, a cycle signal being directed towards a second input of the RS-flip flop and also towards a third input of the output logic circuit.
Claim 10
Dependent Claim
23 words
An arrangement in accordance with claim 8 that is characterized by the RS-flip flop being constructed with two logic-gates of the same type.
Claim 11
Dependent Claim
50 words
An arrangement in accordance with claim 8 that is characterized by the output logic circuit comprising two And-gates, the outputs of said And-gates each being directed towards an input of an Or-gate, one of the And-gates having an inverted input that is connected to an input of the other And-gate.
Claim 12
Dependent Claim
58 words
An arrangement in accordance to claim 8 that is characterized by the output logic circuit comprising two Nand-gates, the outputs of said Nand-gates each being directed towards an input of a third Nand-gate, one of the two first Nand-gates having an inverting input that is connected to the input of the other one of the two first Nand-gates.
References Cited (Backward Citations)
US4091316A
Cited
US4540928A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-27 | 1991-01-26 | 1991-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-27 | 1995-01-26 | 1995-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-27 | 1999-01-26 | 1999-07-28 | $7700.00 | Window Closed / Lapsed |