GB1032300A - Improvements relating to electric motor control systems - Google Patents

Improvements relating to electric motor control systems

Info

Publication number
GB1032300A
GB1032300A GB4808263A GB4808263A GB1032300A GB 1032300 A GB1032300 A GB 1032300A GB 4808263 A GB4808263 A GB 4808263A GB 4808263 A GB4808263 A GB 4808263A GB 1032300 A GB1032300 A GB 1032300A
Authority
GB
United Kingdom
Prior art keywords
relay
speed
current
generator
rectifier
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
GB4808263A
Inventor
John Cedric Gosling
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.)
Associated Electrical Industries Ltd
Original Assignee
Associated Electrical Industries 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 Associated Electrical Industries Ltd filed Critical Associated Electrical Industries Ltd
Priority to GB4808263A priority Critical patent/GB1032300A/en
Publication of GB1032300A publication Critical patent/GB1032300A/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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
    • B66B5/04—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions for detecting excessive speed
    • B66B5/06—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions for detecting excessive speed electrical

Landscapes

  • Control Of Multiple Motors (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

1,032,300. Control of D.C. motors. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. Nov. 27, 1964 [Dec. 5, 1963], No. 48082/63. Heading H2J. The speed of lift motor 1, which is supplied from generator 2, is controlled in accordance with a programme, the speed being monitored at one or more points during the programme by an emergency stop relay 14. In normal operation of the system, the relay is operated by current derived from a D.C. source through resistor 18, this current being reduced when one of the limit approach switches 20, 21 is opened to introduce the resistor 19. If the voltage across rectifier 11 is excessive, then an opposing current, which represents the speed of the lift motor, is sufficient to reduce the relay-current to the release-value so that the motor is braked to a standstill. Zener diode 16 prevents false operation of the relay if rectifier 15 is shortcircuited, and protects the relay-coil if excessive current flows from point C. The rectifier 15 is guarded against voltage peaks by capacitor 17. The resistor 18 may be adjusted so that excessive speed of the lift is prevented throughout the whole of its travel. The excitation of generator 2 is controlled by a power amplifier associated with a pre-amplifier whose input is derived from a ramp function generator opposed by feedback from a tachometer generator. The input to the ramp function generator is controlled by potentiometers providing full, intermediate, pre-levelling, and levelling speeds respectively. The potentiometers are connected to switches which are selectively operated in accordance with the position of the lift relative to its destination. In another speed monitoring arrangement, the relay has one coil energized in accordance with the desired speed to maintain the relay normally operated, and an opposing coil receiving the current corresponding to actual speed, to release the relay when overspeed occurs.
GB4808263A 1963-12-05 1963-12-05 Improvements relating to electric motor control systems Expired GB1032300A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4808263A GB1032300A (en) 1963-12-05 1963-12-05 Improvements relating to electric motor control systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4808263A GB1032300A (en) 1963-12-05 1963-12-05 Improvements relating to electric motor control systems

Publications (1)

Publication Number Publication Date
GB1032300A true GB1032300A (en) 1966-06-08

Family

ID=10447314

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4808263A Expired GB1032300A (en) 1963-12-05 1963-12-05 Improvements relating to electric motor control systems

Country Status (1)

Country Link
GB (1) GB1032300A (en)

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