US3609488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control for a synchronous motor
Assignee: United States Department of the Navy
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Filing: 1970-03-09
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Granted: 1971-09-28
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Expires: 1990-03-09
Abstract
Abstract A motor control means to accomplish frequency changing which in turn achieves a speed change in a synchronous motor comprising a voltage controlled oscillator which responds to a discriminator circuit which either increases or decreases the frequency output of the oscillator in accordance with whether a synchronizing pulse is early or late with respect to an enabling pulse.
Inventors
- 👤 John B Sampson
- 👤 Hadyn L Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:23
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/18; H02P23/186
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
194 words
Speed control means responsive to low frequency pulses for a motor comprising; pulse-producing means which produce output pulses of a certain frequency in accordance with and in response to an input voltage; input means adapted to receive regularly occurring input pulses; said input pulses having a period Alpha + OR - Delta Alpha ; first gating means for producing an output pulse of a predetermined length; second gating means for producing an output pulse of the same length as said first gating means; said first and second gating means being operatively connected to said input means for receiving said input pulses; gate control means operatively connected to the output of said pulse-producing means for producing an enabling pulse which is coupled to said first and second gating means; summing means operatively connected to said first and second gating means for receiving and summing the outputs from said first and second gating means and producing an output voltage corresponding to + OR - Delta Alpha ; the output of said summing means being connected to said pulseproducing means to cause the output frequency of said pulseproducing means to vary in accordance with Delta Alpha .
Claim 2
Dependent Claim
194 words
Speed control means responsive to low frequency pulses for a motor comprising; pulse-producing means which produce output pulses of a certain frequency in accordance with and in response to an input voltage; input means adapted to receive regularly occurring input pulses; said input pulses having a period Alpha + OR - Delta Alpha ; first gating means for producing an output pulse of a predetermined length; second gating means for producing an output pulse of the same length as said first gating means; said first and second gating means being operatively connected to said input means for receiving said input pulses; gate control means operatively connected to the output of said pulse-producing means for producing an enabling pulse which is coupled to said first and second gating means; summing means operatively connected to said first and second gating means for receiving and summing the outputs from said first and second gating means and producing an output voltage corresponding to + OR - Delta Alpha ; the output of said summing means being connected to said pulseproducing means to cause the output frequency of said pulseproducing means to vary in accordance with Delta Alpha .
Claim 3
Dependent Claim
57 words
Speed control means as set forth in claim 1 and further including; integrator means operatively connected in the output circuit of said first and second gating means for producing an output voltage corresponding to the time interval during which an enabling pulse and input pulse are present at the inputs to said first and second gating means.
Claim 4
Dependent Claim
37 words
Speed control means as set forth in claim 1 and further including; pulse inverter means operatively connected between said input means and said one of said first and second gating means for inverting the input pulse thereto.
Claim 5
Dependent Claim
28 words
Speed control means as set forth in claim 3 and further including; synchronous motor means operatively connected to the output of said pulse-producing means and being driven thereby.
Claim 6
Dependent Claim
17 words
Speed control means as set forth in claim 1 wherein; said pulse-producing means is a voltage-controlled oscillator.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |