GB820638A - Improvements in or relating to apparatus for starting alternating current slip-ring motors - Google Patents
Improvements in or relating to apparatus for starting alternating current slip-ring motorsInfo
- Publication number
- GB820638A GB820638A GB16777/56A GB1677756A GB820638A GB 820638 A GB820638 A GB 820638A GB 16777/56 A GB16777/56 A GB 16777/56A GB 1677756 A GB1677756 A GB 1677756A GB 820638 A GB820638 A GB 820638A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rotor
- resistance
- motor
- rectifier
- voltages
- 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
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/26—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor
- H02P1/34—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor by progressive reduction of impedance in secondary circuit
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
820,638. Control of A.C. motors. OFFICINE MECCANICHE RIUNITE S.p.A. May 30, 1956 [Oct. 17, 1955], No. 16777/56. Class 38 (3). Relays 21 ... 24 for controlling the rotor resistance of an induction motor M3 are subjected to the difference between voltages representative of the stator and rotor voltages. respectively, the said representative voltages being derived through transformers TS, TR, and applied to rectifiers RS, RR. When power is supplied to the motor while the rotor is still stationary, the voltage between rectifier-terminals 6, 7 is zero. As the motor-speed increases, the difference-voltage becomes sufficient to operate relay 21 and close contacts 21a in series with contactor coil 31, whereby contacts 31b short-circuit resistance-section R1 and contacts 31a close in series with the relaycoil 22. On further increase of speed, the relay 22 operates to remove the resistance-section R2 and to prepare for the removal of section R3. Thus, the rotor resistance is appropriately reduced as the speed of the motor rises. The rectifier RR is shunted by a resistor R so as to complete the circuit for the relay coils. During reverse-current braking the rectifier RS blocks the circuit of the relays. Specification 794,892 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT820638X | 1955-10-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB820638A true GB820638A (en) | 1959-09-23 |
Family
ID=11317447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB16777/56A Expired GB820638A (en) | 1955-10-17 | 1956-05-30 | Improvements in or relating to apparatus for starting alternating current slip-ring motors |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB820638A (en) |
-
1956
- 1956-05-30 GB GB16777/56A patent/GB820638A/en not_active Expired
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