US4639649A
Expired / Lapsed
US
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Motor control device
Assignee: Canon Inc
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Filing: 1986-03-06
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Granted: 1987-01-27
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Expires: 2006-03-06
Abstract
Abstract A motor control device comprises a motor speed detector, a reference signal generator and a control circuit for controlling rotation of a motor in accordance with a reference signal from the reference signal generator and a speed signal from the motor speed detector. The control circuit includes means for eliminating a phase error component during a phase synchronization pull-in period.
Inventors
- 👤 Kaoru Seto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:33
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/18; H02P23/186; Y; Y10; Y10S; Y10S388/00; Y10S388/90; Y10S388/902; Y10S388/907; Y10S388/908; Y10S388/911; Y10S388/923; Y10S388/933
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
180 words
A motor control device comprising speed detection means for detecting a motor speed and for generating a detection signal having a frequency depending on the motor speed; reference signal generating means for generating a reference signal having a reference frequency; and control means for controlling the motor speed; wherein said control means includes: means for detecting a phase difference between the reference signal and the detection signal and for generating a phase difference signal depending on the phase difference; means for generating a speed signal depending on the frequency of the detection signal; combining means for combining the phase difference signal and the speed signal and for generating a control signal for controlling the motor speed; and error-eliminating means for substantially eliminating from the control signal, generated by said combining means, a phase error component resulting from the phase difference between the reference signal and the detection signal when the phase error component exceeds a predetermined level during the phase synchronization pull-in period, and for providing the control signal from which the error component has been eliminated to said motor.
Claim 2
Dependent Claim
180 words
A motor control device comprising speed detection means for detecting a motor speed and for generating a detection signal having a frequency depending on the motor speed; reference signal generating means for generating a reference signal having a reference frequency; and control means for controlling the motor speed; wherein said control means includes: means for detecting a phase difference between the reference signal and the detection signal and for generating a phase difference signal depending on the phase difference; means for generating a speed signal depending on the frequency of the detection signal; combining means for combining the phase difference signal and the speed signal and for generating a control signal for controlling the motor speed; and error-eliminating means for substantially eliminating from the control signal, generated by said combining means, a phase error component resulting from the phase difference between the reference signal and the detection signal when the phase error component exceeds a predetermined level during the phase synchronization pull-in period, and for providing the control signal from which the error component has been eliminated to said motor.
Claim 3
Dependent Claim
30 words
A motor control device according to claim 1 wherein said combining means includes adder means for adding the phase difference signal to the speed signal at a predetermined summation ratio.
Claim 4
Dependent Claim
67 words
A motor control device according to claim 1 further comprising conductor means for conducting the control signal to said motor and wherein said error-eliminating means includes a pair of resistors and a capacitor connected in series with each other and together connected in parallel with said conductor means, and first and second diodes each connected in parallel with one of said resistors for conducting in opposite directions.
Claim 5
Dependent Claim
15 words
A motor control device according to claim 1 further comprising a phase advance compensation circuit.
Claim 6
Dependent Claim
15 words
A motor control device according to claim 1 further comprising a phase retardation compensation circuit.
Claim 7
Dependent Claim
178 words
A motor control device comprising speed detection means for detecting a motor speed and for generating a detection signal having a frequency depending on the motor speed; reference signal generating means for generating a reference signal having a reference frequency; and control means for controlling the motor speed; wherein said control means includes: means for detecting a phase difference between the reference signal and the detection signal and for generating a phase difference signal depending on the phase difference; means for generating a speed signal depending on the frequency of the detection signal; combining means for combining the phase difference signal and the speed signal and for generating a control signal for controlling the motor speed; and eliminating means for substantially eliminating from the control signal, generated by said combining means, an AC component resulting from the phase difference between the reference signal and the detection signal when the AC component exceeds a predetermined level during the phase synchronization pull-in period, and for providing the control signal from which the AC component has been eliminated to said motor.
Claim 8
Dependent Claim
178 words
A motor control device comprising speed detection means for detecting a motor speed and for generating a detection signal having a frequency depending on the motor speed; reference signal generating means for generating a reference signal having a reference frequency; and control means for controlling the motor speed; wherein said control means includes: means for detecting a phase difference between the reference signal and the detection signal and for generating a phase difference signal depending on the phase difference; means for generating a speed signal depending on the frequency of the detection signal; combining means for combining the phase difference signal and the speed signal and for generating a control signal for controlling the motor speed; and eliminating means for substantially eliminating from the control signal, generated by said combining means, an AC component resulting from the phase difference between the reference signal and the detection signal when the AC component exceeds a predetermined level during the phase synchronization pull-in period, and for providing the control signal from which the AC component has been eliminated to said motor.
Claim 9
Dependent Claim
30 words
A motor control device according to claim 6, wherein said combining means includes adder means for adding the phase difference signal to the speed signal at a predetermined summation ratio.
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) | 1990-01-26 | 1990-07-28 | 1991-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-26 | 1994-07-28 | 1995-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-26 | 1998-07-28 | 1999-01-27 | $7700.00 | Window Closed / Lapsed |