GB835007A - Improvements in over-speed protection for electric motors - Google Patents

Improvements in over-speed protection for electric motors

Info

Publication number
GB835007A
GB835007A GB2674755A GB2674755A GB835007A GB 835007 A GB835007 A GB 835007A GB 2674755 A GB2674755 A GB 2674755A GB 2674755 A GB2674755 A GB 2674755A GB 835007 A GB835007 A GB 835007A
Authority
GB
United Kingdom
Prior art keywords
motor
coil
exciter
energized
over
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
GB2674755A
Inventor
Philip Elworthy Peck
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston 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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Priority to GB2674755A priority Critical patent/GB835007A/en
Publication of GB835007A publication Critical patent/GB835007A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/093—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against increase beyond, or decrease below, a predetermined level of rotational speed

Landscapes

  • Protection Of Generators And Motors (AREA)

Abstract

835,007. Control of D.C. motors. BRITISH THOMSON-HOUSTON CO. Ltd. Sept. 18, 1956 [Sept. 19, 1955], No. 26747/55. Class 38 (3). A motor 2 is protected against over-speeding by means of a circuit-breaker 4 having a tripcoil 12 which is energized when a relay 16 closes contacts 15. A coil 17 of the relay responds to the voltage of an exciter 6 for the motor, whilst a second relay-coil 18 is energized by a motordriven tachometer generator 19. A bridgetype rectifier 20 ensures that the energization of coil 18 is the same for either direction of rotation of the motor, and is in a correct sense to combine with the energization provided by coil 17 when the exciter is operating to reduce the motor-field. The protection afforded thus anticipates conditions in which over-speeding is likely to occur and guards against such overspeeding. The exciter 6 has a field winding 7 for determining the excitation of the motor, and an opposing field winding 9 which is energized from magnetic amplifier 10. A control winding of the amplifier is excited in accordance with the output current of the machine 6. The motor may be supplied from a Ward-Leonard generator 1.
GB2674755A 1955-09-19 1955-09-19 Improvements in over-speed protection for electric motors Expired GB835007A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2674755A GB835007A (en) 1955-09-19 1955-09-19 Improvements in over-speed protection for electric motors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2674755A GB835007A (en) 1955-09-19 1955-09-19 Improvements in over-speed protection for electric motors

Publications (1)

Publication Number Publication Date
GB835007A true GB835007A (en) 1960-05-18

Family

ID=10248592

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2674755A Expired GB835007A (en) 1955-09-19 1955-09-19 Improvements in over-speed protection for electric motors

Country Status (1)

Country Link
GB (1) GB835007A (en)

Similar Documents

Publication Publication Date Title
GB1366229A (en) Alternating current generators
GB835007A (en) Improvements in over-speed protection for electric motors
GB1114435A (en) Improvements relating to brushless direct-current motors
GB665842A (en) Improvements in and relating to electric motor control systems
US2546481A (en) Electrical regulator
GB1000274A (en) Improvements in and relating to control systems for dynamo-electric machines
ES336732A1 (en) Lift drive circuit arrangements
GB845534A (en) Improvements in and relating to ward-leonard equipments
GB683056A (en) Improvements in and relating to dynamo-electric machines
GB773501A (en) Improvements in governors for dynamo-electric machines
GB774423A (en) Improvements in or relating to direct current electric supply systems
GB709765A (en) Improvements in and relating to control systems for electric machines
GB681732A (en) Improvements in and relating to electric ship propulsion systems
GB180754A (en) Improvements relating to direct-current electric motors
GB838781A (en) Improvements in electric motor control systems
GB510342A (en) Improvements in and relating to systems of control for reciprocating machines
GB719654A (en) Improvements in or relating to control arrangements for electric locomotives
GB553082A (en) Improvements in control systems for associated dynamo-electric machines particularly applicable to rolling mill drives
GB545392A (en) Improvements in and relating to control systems for electric motors
GB670856A (en) Improvements in and relating to the braking of induction motors
GB756980A (en) Improvements in or relating to protective systems for direct current motors
GB693899A (en) Improvements in and relating to electric motor control systems
GB682623A (en) Improvements in control systems for electric motors
GB526562A (en) Improvements in and relating to electric motor control systems
GB139836A (en) Improvements in and relating to automatic regulating systems for dynamo electric machines