US3835357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for speed regulation of alternating current motors
Assignee: Individual
•
Filing: 1972-12-29
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Granted: 1974-09-10
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Expires: 1992-12-29
Abstract
Abstract The invention relates to an apparatus and method for the speed regulation of alternating current motors. The speed of the motor is indicated by the tachometer and it is compared with a reference value indicative of a desired speed to cut off power to the motor when it exceeds the desired speed. The power remains off for a preset time and then is restored until the motor exceeds the desired speed again.
Inventors
- 👤 W Holzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:12
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/29; H02P21/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
195 words
An arrangement for the speeD regulation of an alternating current motor through the repeated cut off of the current supply by means of electronic switching comprising the combination of: a standard frequency source; timing means including a monostable multivibrator controlled by said standard frequency source and providing a series of output timing signals; a tachometer operatively coupled with the motor and providing an output signal indicative of the speed of the motor; rectifying means for rectifying the output signal of said tachometer; means for combining the output timing signals of said multivibrator and the rectified output signal of said tachometer for producing a combination signal; a transistor circuit for receiving the combination signal and generating an output signal having a first component indicative that a requisite speed has been attained and a second component in response to the output timing signals of said multivibrator; and thyratron means in the current supply line for receiving the first component of the output signal from the transistor circuit upon requisite speed attainment and in response cutting off the current supply and upon receiving the second component of the output signal from the transistor circuit reconnecting the current supply.
Claim 2
Dependent Claim
195 words
An arrangement for the speeD regulation of an alternating current motor through the repeated cut off of the current supply by means of electronic switching comprising the combination of: a standard frequency source; timing means including a monostable multivibrator controlled by said standard frequency source and providing a series of output timing signals; a tachometer operatively coupled with the motor and providing an output signal indicative of the speed of the motor; rectifying means for rectifying the output signal of said tachometer; means for combining the output timing signals of said multivibrator and the rectified output signal of said tachometer for producing a combination signal; a transistor circuit for receiving the combination signal and generating an output signal having a first component indicative that a requisite speed has been attained and a second component in response to the output timing signals of said multivibrator; and thyratron means in the current supply line for receiving the first component of the output signal from the transistor circuit upon requisite speed attainment and in response cutting off the current supply and upon receiving the second component of the output signal from the transistor circuit reconnecting the current supply.
Claim 3
Dependent Claim
52 words
An arrangement as defined in claim 1, further comprising: a desires speed setter for providing an analog representation of the desired speed through the use of a variable voltage and means for comparing the variable voltage and the output signal of the tachometer and for indicating the attainment of the desired speed.
Claim 4
Dependent Claim
43 words
An arrangement as defined in claim 1, wherein the frequency of the output signal of the tachometer serves as the comparison magnitude and is convertible into an analogous comparison voltage for cutting off the current supply upon coincidence with an analogous desired-speed voltage.
Claim 5
Dependent Claim
27 words
An arrangement as defined in claim 1, further comprising: a desired-speed setting, a timer and a controlled gate for controlling the supply of current to the motor.
Claim 6
Dependent Claim
61 words
An arrangement as defined in claim 2, wherein the desired-speed setter includes a variable resistor with the voltage derived therefrom being applicable to the input of the transistor circuit and the transistor circuit switching the timing means from the monostable to the unstable state by way of a change of potential and maintaining the same during a period of time to.
Claim 7
Dependent Claim
29 words
An arrangement as defined in claim 1, wherein a synchronizing impulse opens the thyratron means and switches the motor on at the end of each period of time to.
Claim 8
Dependent Claim
63 words
An arrangement as defined in claim 2 wherein the transistor circuit directly opens the thyratron and switches the motor on when superimposed synchronizing impulses are fed to the multivibrator vibrating at a frequency of to-1 and with the impulses being applied to the input of the electronic control circuit and producing the switching action as the main voltage passes through the zero point.
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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |