GB745331A - Improvements in and relating to current limiting systems - Google Patents

Improvements in and relating to current limiting systems

Info

Publication number
GB745331A
GB745331A GB35066/53A GB3506653A GB745331A GB 745331 A GB745331 A GB 745331A GB 35066/53 A GB35066/53 A GB 35066/53A GB 3506653 A GB3506653 A GB 3506653A GB 745331 A GB745331 A GB 745331A
Authority
GB
United Kingdom
Prior art keywords
amplifier
current
field
motor
windings
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
GB35066/53A
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 Canada Co
Original Assignee
Canadian General Electric Co Ltd
General Electric Canada Co
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 Canadian General Electric Co Ltd, General Electric Canada Co filed Critical Canadian General Electric Co Ltd
Publication of GB745331A publication Critical patent/GB745331A/en
Expired legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66BELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B1/00Control systems of elevators in general
    • B66B1/02Control systems without regulation, i.e. without retroactive action
    • B66B1/06Control systems without regulation, i.e. without retroactive action electric

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Direct Current Motors (AREA)

Abstract

745,331. Automatic current control systems. CANADIAN GENERAL ELECTRIC CO., Ltd. Dec. 16, 1953 [Dec. 16, 1952], No. 35066/53. Class 38 (4). [Also in Group XXXVII] The current supplied to the motor of a Ward- Leonard set is limited by energizing two biased, self-saturating magnetic amplifiers in reversed sense in accordance with the current, and connecting their outputs in series opposition to control the excitation of the Ward-Leonard generator. The motor 1 is supplied by the generator 3 which is of reversible polarity, excited from amplidyne exciter 8 controlled by .a main field 9 and the limiter field 10. The current is detected by the voltage drop across an interpole winding 5. This voltage is applied to the control windings 24, 34 of the self-saturating magnetic amplifiers 20, 30 so as to aid and oppose respectively the self-magnetization. Bias windings 27, 32 oppose windings 24, 34. The amplifier loads, 21, 31 are connected in series opposition in series with the field 10 of the exciter. Hence when the motor current is below the level set by the bias windings 27, 32, the small outputs of the amplifiers 20, 30 are equal and opposite, and the field 10 is unexcited. Currents due to any slight unbalance are prevented by the reversely connected pair of contact rectifiers 18. When the motor current exceeds the limiting value the output of amplifier 20 rises rapidly but there is little change in the output of amplifier 30, and the field 10 is excited in a sense to reduce the motor current. When the generator polarity is reversed, amplifier 30 saturates instead of amplifier 20.
GB35066/53A 1952-12-16 1953-12-16 Improvements in and relating to current limiting systems Expired GB745331A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA745331X 1952-12-16

Publications (1)

Publication Number Publication Date
GB745331A true GB745331A (en) 1956-02-22

Family

ID=4172331

Family Applications (1)

Application Number Title Priority Date Filing Date
GB35066/53A Expired GB745331A (en) 1952-12-16 1953-12-16 Improvements in and relating to current limiting systems

Country Status (1)

Country Link
GB (1) GB745331A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1133799B (en) * 1957-01-29 1962-07-26 Licentia Gmbh Arrangement for regulating the armature voltage of a Leonard generator
DE1176252B (en) * 1956-06-21 1964-08-20 Licentia Gmbh Arrangement for current limitation with the help of a magnetic amplifier in a control device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1176252B (en) * 1956-06-21 1964-08-20 Licentia Gmbh Arrangement for current limitation with the help of a magnetic amplifier in a control device
DE1133799B (en) * 1957-01-29 1962-07-26 Licentia Gmbh Arrangement for regulating the armature voltage of a Leonard generator

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