GB715583A - Improvements relating to electric motor control systems for mine winders and the like - Google Patents
Improvements relating to electric motor control systems for mine winders and the likeInfo
- Publication number
- GB715583A GB715583A GB2157352A GB2157352A GB715583A GB 715583 A GB715583 A GB 715583A GB 2157352 A GB2157352 A GB 2157352A GB 2157352 A GB2157352 A GB 2157352A GB 715583 A GB715583 A GB 715583A
- Authority
- GB
- United Kingdom
- Prior art keywords
- motor
- braking
- relay
- control
- energize
- 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
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
- H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control And Safety Of Cranes (AREA)
- Control Of Multiple Motors (AREA)
Abstract
715,583. Control of A.C. motors. ENGLISH ELECTRIC CO., Ltd. Aug. 14, 1953 [Aug. 27, 1952], No. 21573/52. Class 38(3) [Also in Group XXXV] In a control system for a hoist driven by a wound rotor induction motor 10 the rectified output of a tachometer generator 15 and a reference voltage from a hoist-position-operated potentiometer 19 are applied differentially to the control windings 18a, 18b of magnetic amplifier energizing a torque motor 21 controlling a hydraulic rotor-resistanceactuator 25. Negative overspeed error signals of sufficient amplitude cause the torque motor to operate dynamic-braking-contacts EB1 applying D.C. to the stator from sources 12. 13. (Source 12 is a constant voltage D.C.; the voltage of source 13 varies with the speed of the motor). STARTING HOISTING Assuming the previous wind to have been in the reverse direction, start button SB energizes (i) contactor F over winder-operated limit-switches LSF, LSB and (ii) relay A which applies a small positive voltage from potentiometer 19 to magnetic amplifier control winding 18b; this causes a reduction in rotor resistance until the motor load current operates relay LC to release the mechanical brakes. As the motor speeds up contacts SS are opened to release relay A thereby connecting the slider of potentiometer 19 to the control winding 18b. and hoisting proceeds according to a set programme. DYNAMIC BRAKING. When the speed error becomes negative, contacts EB1, 2 are operated to energize the braking contactor B; de-energize the motor contactor F, (or R); and energize relay G to reverse the connections to the magnetic amplifier, so that rotor resistance control is in the correct sense for braking. LIMITING CIRCUITS. (i) [The emergency stop]. The emergency stop is initiated by a voltage sensitive relay 37 in series with a rectifier 38 across the control windings 18a. b. (ii) Acceleration (or deceleration) is limited by a solenoid 30 restricting the outlet of the hydraulic actuator 25. and energized through a magnetic amplifier 27 controlled by a differentiating network 28, 29 fed from the tachometer generator 15. (iii) Overload current relays CL and BCL responsive to motoring and braking currents energize a solenoid 33 to restrict the actuator outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2157352A GB715583A (en) | 1952-08-27 | 1952-08-27 | Improvements relating to electric motor control systems for mine winders and the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2157352A GB715583A (en) | 1952-08-27 | 1952-08-27 | Improvements relating to electric motor control systems for mine winders and the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB715583A true GB715583A (en) | 1954-09-15 |
Family
ID=10165182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2157352A Expired GB715583A (en) | 1952-08-27 | 1952-08-27 | Improvements relating to electric motor control systems for mine winders and the like |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB715583A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3097267A (en) * | 1958-08-08 | 1963-07-09 | Ampex | Tape recording and/or reproducing system and method |
-
1952
- 1952-08-27 GB GB2157352A patent/GB715583A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3097267A (en) * | 1958-08-08 | 1963-07-09 | Ampex | Tape recording and/or reproducing system and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4068741A (en) | Elevator motor control system for a.c. induction motor | |
| GB715583A (en) | Improvements relating to electric motor control systems for mine winders and the like | |
| GB1172415A (en) | Speed Regulating System Providing Slowdown Control for a Motor having a Unidirectional Converter Armature Supply | |
| US3324373A (en) | Acceleration and braking control system for electric motors | |
| US3078406A (en) | Multi-range hoist system | |
| US2566898A (en) | Traction vehicle control system | |
| GB849902A (en) | Improvements in and relating to control systems for electrically operated winders, hoists, and the like | |
| SU109478A1 (en) | Method of dynamic braking of mine hoists with asynchronous drive | |
| US2488238A (en) | Control system for hoists powered by polyphase induction motor and coupled to a braking generator | |
| GB862954A (en) | Improvements in or relating to control systems for electric lift motors | |
| GB916809A (en) | Improvements in and relating to control systems for electric motor-driven winding, hoisting or the like engines | |
| US2817049A (en) | Ward-leonard control for wire spooler | |
| US2243337A (en) | Motor control system for electric winding gear | |
| GB738310A (en) | Improvements in or relating to control systems for electric motors | |
| GB809713A (en) | Improvements in or relating to braking arrangements for electric motors | |
| GB872374A (en) | Improvements in or relating to electric control systems | |
| GB814458A (en) | Improvements in or relating to adjustable voltage drives for electric motors | |
| GB744160A (en) | A control arrangement for electric motors | |
| GB740257A (en) | Improvements in or relating to control systems for electric motors | |
| GB895113A (en) | Improvements in and relating to electric closed-loop control system | |
| GB479313A (en) | Improvements in and relating to electric motor control systems for electric winding gear | |
| Freeman | A means of providing controlled acceleration and deceleration and also controlled regenerative emergency braking on ward-leonard mine hoists | |
| GB591238A (en) | Improvements in electric control systems for winding and like mechanisms | |
| GB588209A (en) | Improvements relating to electric control systems for electric motors, steam engines and other prime movers | |
| GB791076A (en) | Improvements in and relating to electric winder control systems |