GB794892A - Improvements in control devices for electric motors - Google Patents

Improvements in control devices for electric motors

Info

Publication number
GB794892A
GB794892A GB535653A GB535653A GB794892A GB 794892 A GB794892 A GB 794892A GB 535653 A GB535653 A GB 535653A GB 535653 A GB535653 A GB 535653A GB 794892 A GB794892 A GB 794892A
Authority
GB
United Kingdom
Prior art keywords
relay
load
rotor resistance
motor
relays
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
GB535653A
Inventor
James Rignell Walton
Augustus David John Ractliffe
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.)
Electrical Apparatus Co Ltd
Original Assignee
Electrical Apparatus 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 Electrical Apparatus Co Ltd filed Critical Electrical Apparatus Co Ltd
Priority to GB535653A priority Critical patent/GB794892A/en
Publication of GB794892A publication Critical patent/GB794892A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
    • H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
    • H02P1/26—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor
    • H02P1/34—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor by progressive reduction of impedance in secondary circuit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/18—Control systems or devices
    • B66C13/22—Control systems or devices for electric drives
    • B66C13/23—Circuits for controlling the lowering of the load
    • B66C13/26—Circuits for controlling the lowering of the load by ac motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C2700/00—Cranes
    • B66C2700/08—Electrical assemblies or electrical control devices for cranes, winches, capstans or electrical hoists
    • B66C2700/081—Electrical assemblies or electrical control devices for cranes, winches, capstans or electrical hoists with ac motors

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Control Of Multiple Motors (AREA)
  • Motor And Converter Starters (AREA)

Abstract

794,892. Control of A.C. motors. ELECTRICAL APPARATUS CO., Ltd. May 21, 1954 [Feb. 26, 1953], No. 5356/53. Class 38 (3). When an induction motor 1 accelerates from rest and the voltage across its slip-rings decreases, the potential difference developed across resistor 32 by means of rectifier 26 falls below the value of a constant potential difference derived from a rectifier 23. Upon the resultant current passing through relay coils D, E and resistor 32 reaching a predetermined value, the relay E is actuated to energize relay B and remove section 12 of the rotor resistance. As the speed of the motor further increases, relay D is actuated to energize relay C and remove the remaining section 13 of the rotor resistance, the relays D, E being slugged to prevent actuation due to transient effects. In addition to their use for starting the motor, the relays D, E may be adapted to regulate the rotor resistance in accordance with load, so as to increase the resistance when the load is light and to decrease it when the load is heavy.
GB535653A 1953-02-26 1953-02-26 Improvements in control devices for electric motors Expired GB794892A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB535653A GB794892A (en) 1953-02-26 1953-02-26 Improvements in control devices for electric motors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB535653A GB794892A (en) 1953-02-26 1953-02-26 Improvements in control devices for electric motors

Publications (1)

Publication Number Publication Date
GB794892A true GB794892A (en) 1958-05-14

Family

ID=9794551

Family Applications (1)

Application Number Title Priority Date Filing Date
GB535653A Expired GB794892A (en) 1953-02-26 1953-02-26 Improvements in control devices for electric motors

Country Status (1)

Country Link
GB (1) GB794892A (en)

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