GB690090A - Improvements in and relating to control systems for electric motors - Google Patents

Improvements in and relating to control systems for electric motors

Info

Publication number
GB690090A
GB690090A GB896352A GB896352A GB690090A GB 690090 A GB690090 A GB 690090A GB 896352 A GB896352 A GB 896352A GB 896352 A GB896352 A GB 896352A GB 690090 A GB690090 A GB 690090A
Authority
GB
United Kingdom
Prior art keywords
piston
rotor
fluid
current
resistance
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
Application number
GB896352A
Inventor
Owen Thomas Evans
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Metropolitan Vickers Electrical Co Ltd
Original Assignee
Metropolitan Vickers Electrical Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Metropolitan Vickers Electrical Co Ltd filed Critical Metropolitan Vickers Electrical Co Ltd
Priority to GB896352A priority Critical patent/GB690090A/en
Publication of GB690090A publication Critical patent/GB690090A/en
Expired legal-status Critical Current

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
    • H02P3/22—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 by short-circuit or resistive braking

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Stopping Of Electric Motors (AREA)

Abstract

690,090. Automatic control systems for hoists. METROPOLITAN-VICKERS ELECTRICALCO., Ltd. Sept. 19, 1950, No. 8963/52. Divided out of 690,035. Class 38 (iv). [Also in Group XXXVII] An asynchronous motor 1 which may drive a mine hoist is braked by applying directcurrent to its stator winding and connecting its rotor winding to a liquid rheostat 8, movement of a manually-controlled fluid-pressure servomotor 24, which varies the resistance, being automatically limited to prevent the rotor current exceeding the value corresponding to maximum braking torque. The resistor is adjusted by piston 25 moved by fluid supplied from pump 103. A control lever 100 passes a hollow sleeve 101 through the piston, an orifice 109 in the seeve being covered by the piston until the piston has moved to a position wherein the orifice is uncovered and the fluid by-passed to sump 103a. A valve 104 is linked to the piston so that the supply of fluid thereto, together with the rate of removal of rotor resistance, is reduced after the piston has accomplished a pre-determined portion of its movement. A normally-closed by-pass valve 111 is opened by a torque motor 112, which is energized in accordance with the output of current transformers 33, when the rotor current exceeds a value such that further reduction of the rotor resistance would cause a fall, instead of an increase of braking torque. The arrangement shown may replace the current-limiting arrangements described in Specification 690,035.
GB896352A 1950-09-19 1950-09-19 Improvements in and relating to control systems for electric motors Expired GB690090A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB896352A GB690090A (en) 1950-09-19 1950-09-19 Improvements in and relating to control systems for electric motors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB896352A GB690090A (en) 1950-09-19 1950-09-19 Improvements in and relating to control systems for electric motors

Publications (1)

Publication Number Publication Date
GB690090A true GB690090A (en) 1953-04-08

Family

ID=9862679

Family Applications (1)

Application Number Title Priority Date Filing Date
GB896352A Expired GB690090A (en) 1950-09-19 1950-09-19 Improvements in and relating to control systems for electric motors

Country Status (1)

Country Link
GB (1) GB690090A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2891960A1 (en) * 2005-10-12 2007-04-13 Leroy Somer Moteurs ELECTROMECHANICAL DRIVE SYSTEM, IN PARTICULAR FOR PROGRESSIVE CAVITY PUMP FOR OIL WELL.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2891960A1 (en) * 2005-10-12 2007-04-13 Leroy Somer Moteurs ELECTROMECHANICAL DRIVE SYSTEM, IN PARTICULAR FOR PROGRESSIVE CAVITY PUMP FOR OIL WELL.
WO2007042732A1 (en) * 2005-10-12 2007-04-19 Moteurs Leroy-Somer Electromechanical driving system, in particular for progressive cavity pump for oil well
US7880418B2 (en) 2005-10-12 2011-02-01 Moteurs Leroy-Somer Electromechanical drive system, in particular for progressive cavity pumps for oil wells

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