US4296446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor speed control circuit
Assignee: RCA Corp
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Filing: 1979-11-15
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Granted: 1981-10-20
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Expires: 1999-11-15
Abstract
Abstract A motor speed control circuit features a speed synthesizer for accurate speed control. The synthesizer has a phase-locked loop with a programmable divider for allowing variable speeds.
Inventors
- 👤 George S. Zorbalas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:42
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/46; G11B15/54; H; H02; H02P; H02P23/00; H02P23/18; H02P23/186
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
105 words
A circuit for controlling the speed of a motor, said circuit comprising: a speed synthesizer having first input means for receiving a digital speed command signal, a second input means, and an output means for supplying a variable speed control signal; a means for supplying a reference signal to said second input means; a motor drive circuit having an input means for receiving said variable speed control signal and adapted to be coupled to said motor for speed control thereof; and wherein said speed synthesizer comprises a frequency comparator having a first input coupled to said reference signal means, a second input, and an output;
Claim 2
Dependent Claim
105 words
A circuit for controlling the speed of a motor, said circuit comprising: a speed synthesizer having first input means for receiving a digital speed command signal, a second input means, and an output means for supplying a variable speed control signal; a means for supplying a reference signal to said second input means; a motor drive circuit having an input means for receiving said variable speed control signal and adapted to be coupled to said motor for speed control thereof; and wherein said speed synthesizer comprises a frequency comparator having a first input coupled to said reference signal means, a second input, and an output;
Claim 3
Dependent Claim
7 words
a filter coupled to said comparator output;
Claim 4
Dependent Claim
7 words
a filter coupled to said comparator output;
Claim 5
Dependent Claim
53 words
a voltage controlled oscillator having a control input coupled to said filter and an output; and a programmable divider having an input coupled to said oscillator output, a control input comprising said synthesizer first input means for receiving said digital speed command signal, and an output coupled to said frequency comparator second input.
Claim 6
Dependent Claim
53 words
a voltage controlled oscillator having a control input coupled to said filter and an output; and a programmable divider having an input coupled to said oscillator output, a control input comprising said synthesizer first input means for receiving said digital speed command signal, and an output coupled to said frequency comparator second input.
Claim 7
Dependent Claim
50 words
A circuit as claimed in claim 1, further comprising switch means coupled to said speed synthesizer output means, said reference signal supplying means, and said motor drive circuit for providing selection between said reference signal means and said synthesizer for control of said motor drive circuit and hence said motor.
Claim 8
Dependent Claim
75 words
A circuit as claimed in claim 1, wherein said reference signal supplying means comprises a frequency comparator having a first input means for receiving a synchronization signal, a second input, and an output; a filter coupled to said output; a voltage controlled oscillator having a control input coupled to said filter and an output; and a frequency divider having an input coupled to said oscillator output, and an output coupled to said comparator second input.
Claim 9
Dependent Claim
16 words
A circuit as claimed in claim 4, wherein said synchronization signal comprises a vertical synchronization signal.
Claim 10
Dependent Claim
89 words
A circuit as claimed in claim 1, wherein said motor drive circuit comprises: a frequency comparator having a first input means for receiving one of a normal speed control signal and said variable speed control signal, a second input, and an output; a loop compensation filter coupled to said comparator output; a motor drive amplifier coupled to said filter and adapted to be coupled to the motor; and a tachometer having an input adapted to be coupled to said motor, and an output coupled to said comparator second input.
Claim 11
Dependent Claim
18 words
A circuit as claimed in claim 1, further comprising said motor, said motor having a capstan mounted thereto.
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) | 1984-10-19 | 1985-04-20 | 1985-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-19 | 1989-04-20 | 1989-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-19 | 1993-04-20 | 1993-10-20 | $7700.00 | Window Closed / Lapsed |