GB690035A - Improvements in and relating to electrical winding and like gear - Google Patents
Improvements in and relating to electrical winding and like gearInfo
- Publication number
- GB690035A GB690035A GB2808949A GB2808949A GB690035A GB 690035 A GB690035 A GB 690035A GB 2808949 A GB2808949 A GB 2808949A GB 2808949 A GB2808949 A GB 2808949A GB 690035 A GB690035 A GB 690035A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transductor
- current
- output
- rectifier
- rotor
- 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 Electric Motors In General (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
690,035. Automatic control systems for hoists. METROPOLITAN-VICKERS ELECTRICAL CO., Ltd. Sept. 19, 1950 [Nov. 2, 1949], No. 28089/49. Class 38 (iv). [Also in Group XXXVII] The speed of an induction motor 1 driving a hoist is measured by a tachometer generator 13, the output of which is compared with a reference voltage tapped off potentiometer 17, any difference being amplified by transductors 20, 21 to control the coil 22 and hydraulic servomotor 24 which correctively varies the resistor 8 in the rotor circuit. The reference voltage is varied by a cam 19 according to the position of the hoist cage to suitably accelerate and slow down the cage. If the tachometer output exceeds the reference voltage, rectifier 39 conducts and transductor 38 actuates the dynamic braking relay OCD connecting the stator of the motor to a grid-controlled rectifier 11. The D.C. excitation current is made proportional to (or a non-linear function of), the rotor current by controlling the rectifier according to the rectified and amplified output of current transformers 33. This output is also applied via transductor 37 to the rotor resistor controlling transductor 21 to prevent a predetermined rotor current from being exceeded. The limiting current is determined either by a polarized rectifier limiter on the input to transductor 37 or, Fig. 2 (not shown), the transductor 37 is arranged so that the impedance of the output winding increases abruptly when the current in the control winding falls below a predetermined critical value. Specifications 645,019, 651,379, [Group XXXVII], and 690,090 are referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2808949A GB690035A (en) | 1949-11-02 | 1949-11-02 | Improvements in and relating to electrical winding and like gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2808949A GB690035A (en) | 1949-11-02 | 1949-11-02 | Improvements in and relating to electrical winding and like gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB690035A true GB690035A (en) | 1953-04-08 |
Family
ID=10270090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2808949A Expired GB690035A (en) | 1949-11-02 | 1949-11-02 | Improvements in and relating to electrical winding and like gear |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB690035A (en) |
-
1949
- 1949-11-02 GB GB2808949A patent/GB690035A/en not_active Expired
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