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US3753067A
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Motor speed regulation system
Assignee: Peripheral Systems Corp
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Filing: 1972-05-17
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Granted: 1973-08-14
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Expires: 1992-05-17
Abstract
Abstract A motor speed regulation system employing integrated and discrete semiconductor components, in which either a direct drive signal or a digitally incremented biasing signal is applied to the motor to bring it up to speed or to maintain it at a desired speed under load.
Inventors
- 👤 L Milligan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:29
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/18; H02P23/186; Y; Y10; Y10S; Y10S388/00; Y10S388/923; Y10S388/933
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
121 words
A system for regulating the speed of an electrical motor, which comprises means for generating a first, reference signal for representing a desired condition of the motor, means for generating a second, indicator signal for representing the actual condition of said motor, means for comparing the frequency and phase of said indicator signal with that of said reference signal, and means responsive to the comparing means for applying a direct drive signal or a pulsating drive signal to said motor according to whether the frequency of said reference signal exceeds or equals that of said indicator signal and generating said pulsating drive signal in an amplitude varying between the level of said direct drive signal and a lower, non-zero threshold level.
Claim 2
Independent Claim
121 words
A system for regulating the speed of an electrical motor, which comprises means for generating a first, reference signal for representing a desired condition of the motor, means for generating a second, indicator signal for representing the actual condition of said motor, means for comparing the frequency and phase of said indicator signal with that of said reference signal, and means responsive to the comparing means for applying a direct drive signal or a pulsating drive signal to said motor according to whether the frequency of said reference signal exceeds or equals that of said indicator signal and generating said pulsating drive signal in an amplitude varying between the level of said direct drive signal and a lower, non-zero threshold level.
Claim 3
Independent Claim
97 words
A system for regulating the speed of an electrical motor, which comprises means for generating a first, reference signal for representing a desired condition of the motor, means for generating a second, indicator signal for representing the actual condition of said motor, means for comparing said indicator signal with said reference signal, and means responsive to the comparing means for applying to said motor a pulsating drive signal varying in amplitude between uPper and lower non-zero threshold levels when said motor operates under load and the frequency of said reference signal equals that of said indicator signal.
Claim 4
Independent Claim
97 words
A system for regulating the speed of an electrical motor, which comprises means for generating a first, reference signal for representing a desired condition of the motor, means for generating a second, indicator signal for representing the actual condition of said motor, means for comparing said indicator signal with said reference signal, and means responsive to the comparing means for applying to said motor a pulsating drive signal varying in amplitude between uPper and lower non-zero threshold levels when said motor operates under load and the frequency of said reference signal equals that of said indicator signal.
Claim 5
Dependent Claim
36 words
A motor speed regulation system as defined in claim 2 wherein the magnitude of the lower non-zero threshold level is less than that of the back electromotive force of said motor at the desired speed thereof.
Claim 6
Dependent Claim
41 words
A motor speed regulation system as defined in claim 2 wherein the means for generating said indicator signal includes a tachometer for generating a signal having a frequency in excess of the rotation rate of said motor and is mounted thereon.
Claim 7
Dependent Claim
63 words
A motor speed regulation system as defined in claim 4 wherein said tachometer includes a transparent disk mounted on a shaft of said motor and having equidistant segments thereon near the circumference thereof, a stationary, apertured masking disk aligned with the segment bearing disk and photosensitive means for generating said indicator signal as said segment bearing disk rotates relative to said apertured disk.
Claim 8
Dependent Claim
32 words
A motor speed regulation system as defined in claim 4 wherein said means for generating said indicator signal includes a divider for the tachometer signal, thereby to reduce the jitter effect thereof.
Claim 9
Dependent Claim
23 words
A motor speed regulation system as defined in claim 1 wherein the means for generating said reference signal comprises a variable frequency oscillator.
Claim 10
Dependent Claim
30 words
A motor speed regulation system as defined in claim 7 wherein said variable frequency oscillator includes a stable crystal-controlled oscillator having a frequency in excess of that of said motor.
Claim 11
Dependent Claim
30 words
A speed regulation system as defined in claim 7 further including means for dividing the output of said oscillator to produce a reference signal for comparison with said indicator signal.
Claim 12
Dependent Claim
38 words
A speed regulation system as defined in claim 2 wherein the constituents of said system are formed by complementary symmetry metal-oxide-semiconductor components for the means for generating said reference signal and by transistor-transistor-logic components for said comparing means.
Claim 13
Dependent Claim
25 words
A speed regulation system as defined in claim 2 wherein the means for generating said indicator signal includes means for reducing the duty cycle thereof.
Claim 14
Dependent Claim
35 words
A motor speed regulation system as defined in claim 2 wherein said comparing means generates an output train of pulses, each of a width proportional to the phase difference between said first and second signals.
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |