GB809713A - Improvements in or relating to braking arrangements for electric motors - Google Patents

Improvements in or relating to braking arrangements for electric motors

Info

Publication number
GB809713A
GB809713A GB3561656A GB3561656A GB809713A GB 809713 A GB809713 A GB 809713A GB 3561656 A GB3561656 A GB 3561656A GB 3561656 A GB3561656 A GB 3561656A GB 809713 A GB809713 A GB 809713A
Authority
GB
United Kingdom
Prior art keywords
braking
control
current
winding
winder
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
GB3561656A
Inventor
Erich Siegfried Friedlander
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB3561656A priority Critical patent/GB809713A/en
Publication of GB809713A publication Critical patent/GB809713A/en
Expired legal-status Critical Current

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
    • 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
    • H02P3/26—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 combined electrical and mechanical braking

Landscapes

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

Abstract

809,713. Automatic speed-control systems. GENERAL ELECTRIC CO. Ltd. Nov. 21, 1957 [Nov. 21, 1956], No. 35616/56. Class 38 (4). [Also in Group XXXVII] An induction motor 1 is connectable to a three-phase supply for forward or reverse driving operation, provision also being made for direct-current braking operation. A servomotor 7 has windings 8 and 9 for respectively increasing and decreasing the rotor resistance 4. A mechanical brake 10 is applied by weight 11 and is lifted by fluid pressure under the control of governor 12 which may be set manually or automatically in dependence upon a desired motor speed. The winding 8 is energized in accordance with the rotor current, whilst the winding 9 is controlled by magnetic amplifier 17 having its control winding connected to resistance bridge 18. A variable tapping-point on resistor 20 is automatically adjusted in response to the fluid pressure in the braking system. The control current for the magnetic amplifier is thus dependent upon the mechanical braking effort, which is in turn dependent upon the setting of the governor. A polarized relay 22 is arranged to alter the stator connections of the motor 1 from driving to dynamic braking upon reversal of current in the control winding of the magnet amplifier, so that the driving or braking torque is adjusted to minimize the braking effort necessary for accurate speed-control. The fixed tapping- point on resistor 19 may be preset so that reversal of current takes place when the mechanical braking pressure reaches a predetermined fraction of the maximum braking effort. If the induction motor is used for a mine winder, a cam-operated switch is arranged to be opened as the winder approaches bank, thereby interrupting the automatic control circuit. This circuit may also be opened in an emergency. A switch 24 opens in the " off " position of the winder so that the rotor resistance automatically returns to its maximum value.
GB3561656A 1956-11-21 1956-11-21 Improvements in or relating to braking arrangements for electric motors Expired GB809713A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3561656A GB809713A (en) 1956-11-21 1956-11-21 Improvements in or relating to braking arrangements for electric motors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3561656A GB809713A (en) 1956-11-21 1956-11-21 Improvements in or relating to braking arrangements for electric motors

Publications (1)

Publication Number Publication Date
GB809713A true GB809713A (en) 1959-03-04

Family

ID=10379702

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3561656A Expired GB809713A (en) 1956-11-21 1956-11-21 Improvements in or relating to braking arrangements for electric motors

Country Status (1)

Country Link
GB (1) GB809713A (en)

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