US4481453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torque loop control system and method
Assignee: NSK Americas Inc
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Filing: 1982-07-23
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Granted: 1984-11-06
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Expires: 2002-07-23
Abstract
Abstract The present invention is a torque loop control system for reducing the angular position error in a microstepping motor movement when the motor is under a torsional load comprising means for sensing the torsional load on a microstepping motor and producing a sensor output signal indicative of the torsional load, means for receiving and summing an input signal indicative of the desired position of the microstepping motor and the sensor output signal and for producing as an output signal a corrected position signal, and means responsive to the corrected position signal for developing a drive signal for the microstepping motor.
Inventors
- 👤 Ross D. Welburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:35
CPC Classifications
H; H02; H02P; H02P8/00; H02P8/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
108 words
A torque loop control system for reducing angular position error in microstepping motor movement when the motor is under a torsional load comprising: (a) means for sensing the torsional load on a microstepping motor and for producing an output signal indicative of the torsional load; (b) combining means for receiving the output signal indicative of the torsional load on the microstepping motor and for summing it with an input signal indicative of a desired position of the microstepping motor, said means producing as an output signal a corrected position signal; and (c) drive means responsive to the corrected position signal for driving the microstepping motor in accordance therewith.
Claim 2
Dependent Claim
108 words
A torque loop control system for reducing angular position error in microstepping motor movement when the motor is under a torsional load comprising: (a) means for sensing the torsional load on a microstepping motor and for producing an output signal indicative of the torsional load; (b) combining means for receiving the output signal indicative of the torsional load on the microstepping motor and for summing it with an input signal indicative of a desired position of the microstepping motor, said means producing as an output signal a corrected position signal; and (c) drive means responsive to the corrected position signal for driving the microstepping motor in accordance therewith.
Claim 3
Dependent Claim
25 words
The system as recited in claim 1 wherein the input signal indicative of the desired position of the microstepping motor is a parallel digital signal.
Claim 4
Dependent Claim
57 words
The system as recited in claim 2 wherein the means for sensing the torsional load on the microstepping motor includes a strain gauge for producing an analog signal indicative of the torsional load and analog to digital converter means for converting the analog signal to a parallel digital output signal which is supplied to the combining means.
Claim 5
Dependent Claim
42 words
The system as recited in claim 3 wherein the combining means includes an adder/subtracter means which provides as an output signal a parallel digital signal indicative of the desired position of the microstepping motor corrected by the output of the sensing means.
Claim 6
Dependent Claim
37 words
The system as recited in claim 4 wherein the drive means comprises a parallel to serial shift register means for converting the parallel digital signal output from the adder/subtracter means to a serial digital motor driving signal.
Claim 7
Dependent Claim
21 words
The system as recited in claim 1 wherein the torsional load sensing means is located between the motor and the load.
References Cited (Backward Citations)
US4056763A
Cited
US4349771A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |