US4114075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotation control system
Assignee: Panasonic Holdings Corp
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Filing: 1977-07-25
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Granted: 1978-09-12
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Expires: 1997-07-25
Abstract
Abstract Rotation of a rotary machine, e.g. a dc motor is controlled with higher accuracy by the system comprising a rotation speed detector for generating a signal having a repetition frequency dependent on the rotation speed of the rotary machine, a phase comparator having two input terminals one of which is applied with the output signal of the rotation speed detector, a voltage controlled oscillator applied with the output signal of the phase comparator, a frequency divider applied with the output of the voltage controlled oscillator and supplying the output to the other input terminal of said phase comparator, and a rotation speed controlling circuit having an input terminal applied with the output of the voltage controlled oscillator, i.e. a detection signal with a multiplied frequency.
Inventors
- 👤 Hiroshi Minakuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:09
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/288; H02P7/2885; H02P7/29; H02P7/2913
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
128 words
A rotation speed control system for a rotary machine comprising: a rotation speed detector coupled to the rotary machine for generating a signal having a repetition frequency dependent on the rotation speed of the rotary machine; a phase comparator having two input terminals, one of which is applied with the output signal of said rotation speed detector; a voltage controlled oscillator having a control input terminal applied with the output signal of said phase comparator; a frequency divider applied with the output signal of said voltage controlled oscillator and supplying the output signal to the other input terminal of said phase comparator; and a rotation speed controlling circuit for said rotary machine, having a detection signal input terminal applied with the output signal of said voltage controlled oscillator.
Claim 2
Dependent Claim
128 words
A rotation speed control system for a rotary machine comprising: a rotation speed detector coupled to the rotary machine for generating a signal having a repetition frequency dependent on the rotation speed of the rotary machine; a phase comparator having two input terminals, one of which is applied with the output signal of said rotation speed detector; a voltage controlled oscillator having a control input terminal applied with the output signal of said phase comparator; a frequency divider applied with the output signal of said voltage controlled oscillator and supplying the output signal to the other input terminal of said phase comparator; and a rotation speed controlling circuit for said rotary machine, having a detection signal input terminal applied with the output signal of said voltage controlled oscillator.
Claim 3
Dependent Claim
35 words
A rotation speed control system according to claim 1, wherein said rotation speed controlling circuit comprises a frequency discriminating circuit and a dc amplifier circuit applied with the output signal of said frequency discriminating circuit.
Claim 4
Dependent Claim
20 words
A rotation speed control system according to claim 1, wherein said rotation speed controlling circuit comprises a frequency-duty converter circuit.
Claim 5
Dependent Claim
41 words
A rotation speed control system according to claim 2, wherein said frequency divider has a variable frequency dividing ratio so that the rotation speed of said rotary machine can be varied by varying the frequency dividing ratio of said frequency divider.
Claim 6
Dependent Claim
41 words
A rotation speed control system according to claim 3, wherein said frequency divider has a variable frequency dividing ratio so that the rotation speed of said rotary machine can be varied by varying the frequency dividing ratio of said frequency divider.
References Cited (Backward Citations)
US3215918A
Cited
US3970909A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-11 | 1982-03-13 | 1982-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-11 | 1986-03-13 | 1986-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-11 | 1990-03-13 | 1990-09-12 | $7700.00 | Window Closed / Lapsed |