GB835924A - Improvements in or relating to electric motor control arrangements - Google Patents
Improvements in or relating to electric motor control arrangementsInfo
- Publication number
- GB835924A GB835924A GB697257A GB697257A GB835924A GB 835924 A GB835924 A GB 835924A GB 697257 A GB697257 A GB 697257A GB 697257 A GB697257 A GB 697257A GB 835924 A GB835924 A GB 835924A
- Authority
- GB
- United Kingdom
- Prior art keywords
- current
- rotor
- torque
- electromagnet
- voltage
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B1/00—Control systems of elevators in general
- B66B1/02—Control systems without regulation, i.e. without retroactive action
- B66B1/06—Control systems without regulation, i.e. without retroactive action electric
- B66B1/12—Control systems without regulation, i.e. without retroactive action electric with devices, e.g. handles or levers, located at a control station for direct control movements, e.g. electric mining-hoist control systems
Landscapes
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Ac Motors In General (AREA)
- Stopping Of Electric Motors (AREA)
Abstract
835,924. Control of A.C. motors. GENERAL ELECTRIC CO. Ltd. Feb. 25, 1958 [March 1, 1957; Sept. 30, 1957], Nos. 6972/57 and 30543/57. Addition to 774,691. Drawings to Specification. Class 38 (3). [Also in Group XXXV] In a control system as in the parent Specification in which a resistance in the rotor circuit of an induction motor is automatically varied to maintain a value of rotor current corresponding to a desired torque, the desired value of torque is set by varying the effective ratio of the current transformer, responsive to rotor current, which energizes an electromagnet controlling a fluid-operated servo-mechanism varying the rotor resistance. A three-phase liquid resistance is employed in the arrangements described. In one arrangement current transformers energize the electromagnet through auto-transformers which are adjustable by a manually operated lever to set the desired value of torque. In a modification in which motor speed is automatically maintained at a desired value in either direction, the current transformers are of the saturable type and their effective ratios are controlled by energizing control windings in accordance with the difference between the voltage of a tachometer generator coupled to the motor and the voltage from a potentiometer adjusted by a manually operated lever which thus serves to set the motor speed. In this arrangement the difference voltage also controls the electromagnet during motoring. In both arrangements, as in the parent Specification, the rotor current is automatically controlled during direct-current dynamic braking.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB697257A GB835924A (en) | 1957-03-01 | 1957-03-01 | Improvements in or relating to electric motor control arrangements |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB697257A GB835924A (en) | 1957-03-01 | 1957-03-01 | Improvements in or relating to electric motor control arrangements |
Publications (1)
Publication Number | Publication Date |
---|---|
GB835924A true GB835924A (en) | 1960-05-25 |
Family
ID=9824199
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB697257A Expired GB835924A (en) | 1957-03-01 | 1957-03-01 | Improvements in or relating to electric motor control arrangements |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB835924A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116317824A (en) * | 2023-04-08 | 2023-06-23 | 江苏金派克新能源有限公司 | Motor control device |
-
1957
- 1957-03-01 GB GB697257A patent/GB835924A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116317824A (en) * | 2023-04-08 | 2023-06-23 | 江苏金派克新能源有限公司 | Motor control device |
CN116317824B (en) * | 2023-04-08 | 2023-12-22 | 江苏国吉电驱动科技有限公司 | Motor control device |
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