Patent US3885170A successfully refreshed from Google Patents.
US3885170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for motor control
Assignee: Individual
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Filing: 1973-05-25
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Granted: 1975-05-20
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Expires: 1993-05-25
Abstract
Abstract An inductive load sensing circuit associated with triac switched electrical motors including signal means for providing an electrical signal indicative of the switching voltage of the triac, an AND gate connected to receive the signal means output signal and the gating signal to the triac, and means interposed between the AND gate and the signal means for adjusting the signal level of the signal means.
Inventors
- 👤 Roman Kuzyk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:29
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/08; H02H7/0833; H02H7/10; H02H7/12; H02P; H02P25/00; H02P25/02; H02P25/10; H02P25/14; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/292; H02P7/295
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
102 words
Apparatus for providing electrical signals indicative of the loading on an inductive device comprising: switch means for selectively producing an enabling signal; means for switching the inductive device at a predetermined phase angle relative the zero crossings of an A.C. electrical input signal, upon concurrent receipt of said enabling signal; resistive means connected across said means for switching producing voltage signals indicative of the current lag thereacross; and gate means connected to receive said voltage signals and said enabling signal for producing an output signal when said voltage signals are above a predetermined magnitude concurrent with the presence of said enabling signal.
Claim 2
Dependent Claim
102 words
Apparatus for providing electrical signals indicative of the loading on an inductive device comprising: switch means for selectively producing an enabling signal; means for switching the inductive device at a predetermined phase angle relative the zero crossings of an A.C. electrical input signal, upon concurrent receipt of said enabling signal; resistive means connected across said means for switching producing voltage signals indicative of the current lag thereacross; and gate means connected to receive said voltage signals and said enabling signal for producing an output signal when said voltage signals are above a predetermined magnitude concurrent with the presence of said enabling signal.
Claim 3
Dependent Claim
30 words
Apparatus according to claim 1 wherein: said means for switching include a phase lag circuit for producing an output signal at said predetermined phase angle relative said A.C. electrical signal.
Claim 4
Dependent Claim
16 words
Apparatus according to claim 2 wherein: said phase lag circuit includes Resistive and capacitive circuit elements.
Claim 5
Dependent Claim
34 words
Apparatus according to claim 1 further including: time delay means connected to said gate means for disabling said gate means for a predetermined time period immediately subsequent to the start of said enabling signal.
Claim 6
Dependent Claim
30 words
Apparatus according to claim 4 wherein: said means for switching include a phase lag circuit for producing an output signal at said predetermined phase angle relative said A.C. electrical signal.
Claim 7
Dependent Claim
42 words
Apparatus according to claim 5 wherein: said gate means includes an AND gate connected to receive said enabling and voltage signals and disposed to produce an output signal when said voltage signal is above a predetermined amplitude concurrent with said enabling signal.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |