US4434390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor control apparatus with parallel input, serial output signal conditioning means
Assignee: Westinghouse Electric Corp
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Filing: 1982-01-15
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Granted: 1984-02-28
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Expires: 2002-01-15
Abstract
Abstract A motor starter, which may be microprocessor-controlled, is taught wherein a signal conditioning means is provided for receiving from the motor windings parallel inputs and motor bearings which are related to the motor winding and bearing temperatures and for operating on these parallel input signals in such a manner as to provide a single serial output signal for use by a control means to cause the motor control starting sequence or the normal motor run condition to be interrupted, for example, if any one of the temperatures is above a predetermined level.
Inventors
- 👤 Robert T. Elms
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:26
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/0077; H02H; H02H3/00; H02H3/08; H02H3/083; H02H3/085; H02H7/00; H02H7/08; H02H7/0822; H02P1/00; H02P1/02; H02P1/16; H02P1/26; H01; H01H; H01H71/00; H01H2071/006
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
227 words
A motor controller, comprising: (a) digital control means electrically interconnected with a source of motor power and with an electric motor for conducting said power to said motor and for interrupting said power in response to a predetermined condition; (b) a plurality of resistance temperature detector means for providing a multiplicity of analog signals one of which is indicative of the existence of said predetermined condition; (c) a plurality of signal conditioning means each of which is interconnected with one of said resistance temperature detector means for converting the resistance value of said resistance temperature detector means to an analog voltage signal which is temperature related; (d) first multiplex means interconnected at the input thereof in parallel with each of said signal conditioning means for converting said parallel analog voltage signal to serial analog voltage signals; (e) analog to digital conversion means interconnected at the input thereof with said first multiplexer means for receiving said serial analog voltage signals and for providing at the output thereof parallel digital signals representative of said input analog voltage signals; and (f) second multiplexer means interconnected with said analog to digital conversion means for converting said parallel digital signals to a serial train of signals, said digital train of signals being provided to said digital control means for providing a digital indication of said predetermined condition to said digital control means.
Claim 2
Dependent Claim
227 words
A motor controller, comprising: (a) digital control means electrically interconnected with a source of motor power and with an electric motor for conducting said power to said motor and for interrupting said power in response to a predetermined condition; (b) a plurality of resistance temperature detector means for providing a multiplicity of analog signals one of which is indicative of the existence of said predetermined condition; (c) a plurality of signal conditioning means each of which is interconnected with one of said resistance temperature detector means for converting the resistance value of said resistance temperature detector means to an analog voltage signal which is temperature related; (d) first multiplex means interconnected at the input thereof in parallel with each of said signal conditioning means for converting said parallel analog voltage signal to serial analog voltage signals; (e) analog to digital conversion means interconnected at the input thereof with said first multiplexer means for receiving said serial analog voltage signals and for providing at the output thereof parallel digital signals representative of said input analog voltage signals; and (f) second multiplexer means interconnected with said analog to digital conversion means for converting said parallel digital signals to a serial train of signals, said digital train of signals being provided to said digital control means for providing a digital indication of said predetermined condition to said digital control means.
Claim 3
Dependent Claim
17 words
The combination as claimed in claim 1 wherein said predetermined condition is related to motor winding temperature.
Claim 4
Dependent Claim
18 words
The combination as claimed in claim 1 wherein said predetermined condition which is related to motor bearing temperature.
Claim 5
Dependent Claim
23 words
The combination as claimed in claim 1 wherein said digital control means and said second multiplexer means are optically isolated from each other.
Claim 6
Dependent Claim
29 words
The combination as claimed in claim 4 wherein said motor is stopped as a function of the flow of larger than normal current in a portion of said motor.
Claim 7
Dependent Claim
13 words
The combination as claimed in claim 5 wherein said current is fault current.
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) | 1987-02-27 | 1987-08-29 | 1988-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-27 | 1991-08-29 | 1992-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-27 | 1995-08-29 | 1996-02-28 | $7700.00 | Window Closed / Lapsed |