GB454725A - Improvements in or relating to systems of control for electrically operated lifts - Google Patents

Improvements in or relating to systems of control for electrically operated lifts

Info

Publication number
GB454725A
GB454725A GB1231135A GB1231135A GB454725A GB 454725 A GB454725 A GB 454725A GB 1231135 A GB1231135 A GB 1231135A GB 1231135 A GB1231135 A GB 1231135A GB 454725 A GB454725 A GB 454725A
Authority
GB
United Kingdom
Prior art keywords
motor
current
brake
switch
eddy
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
GB1231135A
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 GB1231135A priority Critical patent/GB454725A/en
Publication of GB454725A publication Critical patent/GB454725A/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
    • B66B1/34—Details, e.g. call counting devices, data transmission from car to control system, devices giving information to the control system
    • B66B1/36—Means for stopping the cars, cages, or skips at predetermined levels
    • B66B1/44—Means for stopping the cars, cages, or skips at predetermined levels and for taking account of disturbance factors, e.g. variation of load weight

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Stopping Of Electric Motors (AREA)

Abstract

454,725. Electrically - controlled brakes. GENERAL ELECTRIC CO., Ltd., Magnet House, Kingsway, London, and SMART, N. C., and CHUBB, A. A., c /o General Electric Co., Ltd., Stoke, Coventry. April 24, 1935, No. 12311. [Class 103 (i)] [See also Group XXXVII] The current flowing to an induction motor ST, RO, driving a lift LC is measured during or after every start from a floor, but before deceleration, by means comprising a step-by-step-switch G which determines the degree of energization of an eddy-current or friction brake X during deceleration, the degree of energization being inversely proportional to the said current. Upon operation of a starting switch SO, the driving motor is started and accelerated to full speed, and a relay E is energized from a transformer P in accordance with the current taken by the motor. The coil of the relay E includes a resistance RG over which a wiper G1 of the step-by-step switch G is moved when the motor is started; and when the relay E is sufficiently energized it operates to interrupt the stepping circuit of the switch G which is thus positioned in accordance with the current taken by the motor. The switch G has a contact bank G6 controlling resistance RH in series with the coil of the eddy-current brake, and when the driving motor is decelerated upon approaching a floor at which it is desired to stop, the eddy-current brake is energized and, by the control of the resistance RH, to an extent which is inversely proportional to the current supplied to the motor at starting. When the lift reaches the desired floor the motor is disconnected and a holding brake K applied. The brake X may take the form of a variable friction brake.
GB1231135A 1935-04-24 1935-04-24 Improvements in or relating to systems of control for electrically operated lifts Expired GB454725A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1231135A GB454725A (en) 1935-04-24 1935-04-24 Improvements in or relating to systems of control for electrically operated lifts

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1231135A GB454725A (en) 1935-04-24 1935-04-24 Improvements in or relating to systems of control for electrically operated lifts

Publications (1)

Publication Number Publication Date
GB454725A true GB454725A (en) 1936-10-07

Family

ID=10002176

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1231135A Expired GB454725A (en) 1935-04-24 1935-04-24 Improvements in or relating to systems of control for electrically operated lifts

Country Status (1)

Country Link
GB (1) GB454725A (en)

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