GB894351A - Synchronous motor controls - Google Patents
Synchronous motor controlsInfo
- Publication number
- GB894351A GB894351A GB14706/60A GB1470660A GB894351A GB 894351 A GB894351 A GB 894351A GB 14706/60 A GB14706/60 A GB 14706/60A GB 1470660 A GB1470660 A GB 1470660A GB 894351 A GB894351 A GB 894351A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- field
- output
- pull
- contactor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0805—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for synchronous motors
Landscapes
- Stopping Of Electric Motors (AREA)
Abstract
894,351. Control of A.C. motors; protective arrangements. WESTINGHOUSE ELECTRIC CORPORATION. April 27, 1960 [May 7, 1959], No. 14706/60. Classes 38 (3) and 38 (5). A control system for a synchronous motor 2 having a field-winding 4 adapted to be connected over a field contactor 14 to D.C. excitation leads 8 comprises circuits 26, 28, 24 which initiate field excitation by way of a power switching and amplification circuit 30 when optimum conditions for synchronization occur, and a pull-out protection circuit 44 for deenergizing the operating coil 16 of the contactor 14 when a pull-out occurs. As shown, the circuit 44 embodies NOR elements, i.e. circuit apparatus adapted to provide an output in the absence of an input to the apparatus. On NOR element 512 is connected to respond to the induced alternating current in the fieldwinding 4 and has its output connected to another NOR element 516. The element 512 is connected to the field-winding 4 by way of a voltage divider circuit 500, 502, 504 and a differentiating circuit comprising capacitor 506, resistor 508 and potentiometer 510, the arrangement being such that pull-out conditions cause the element 512 to remove its output whereby element 516 provides an output to the power switching and amplification circuit 30 which acts to de-energize the operating coil 16 of the field contactor 14. Means are provided for by-passing the NOR element 512 during synchronization of the motor.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US894351XA | 1959-05-07 | 1959-05-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB894351A true GB894351A (en) | 1962-04-18 |
Family
ID=22217625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB14706/60A Expired GB894351A (en) | 1959-05-07 | 1960-04-27 | Synchronous motor controls |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB894351A (en) |
-
1960
- 1960-04-27 GB GB14706/60A patent/GB894351A/en not_active Expired
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