GB1252735A - - Google Patents

Info

Publication number
GB1252735A
GB1252735A GB1252735DA GB1252735A GB 1252735 A GB1252735 A GB 1252735A GB 1252735D A GB1252735D A GB 1252735DA GB 1252735 A GB1252735 A GB 1252735A
Authority
GB
United Kingdom
Prior art keywords
torque
ref
speed
rotor
resistance
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
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 filed Critical
Publication of GB1252735A publication Critical patent/GB1252735A/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
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H02P25/24—Variable impedance in stator or rotor circuit
    • H02P25/26—Variable impedance in stator or rotor circuit with arrangements for controlling secondary impedance

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)
  • Motor And Converter Starters (AREA)

Abstract

1,252,735. Control of A.C. motors. ENGLISH ELECTRIC CO. Ltd. 22 Nov., 1968 [22 Nov., 1967], No. 53089/67. Heading H2J. [Also in Division G3] The resistance in the rotor circuit of an induction motor 5 is controlled by means 49 responsive to a speed signal Is which varies non- linearly with the speed N to maintain the torque substantially at a set value at all speeds, and is also responsive to a torque signal IT which varies non-linearly with a torque reference T REF so that the motor torque is in proportion to the torque reference. T REF may be set manually but as shown it represents the difference between a desired speed N REF and the actual speed N a S measured by a tachogenerator 44. The rotor resistance may be continuously variable but as shown comprises resistor sections whose values are in geometric progression with the internal resistance of the rotor, and sections are short circuited in turn by electromagnetic relays 8 . . . 14 controlled by switching amplifiers 18, energized from control means 49 via a linear amplifier 19, and whose operating levels are in arithmetic progression. The characteristics of function generators 24, 48 are derived mathematically.
GB1252735D 1967-11-22 1967-11-22 Expired GB1252735A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5308967 1967-11-22

Publications (1)

Publication Number Publication Date
GB1252735A true GB1252735A (en) 1971-11-10

Family

ID=10466592

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1252735D Expired GB1252735A (en) 1967-11-22 1967-11-22

Country Status (2)

Country Link
GB (1) GB1252735A (en)
ZM (1) ZM16168A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2182216A (en) * 1985-10-23 1987-05-07 Brinkmann Ernst Ind Verwalt Electric motor control

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2182216A (en) * 1985-10-23 1987-05-07 Brinkmann Ernst Ind Verwalt Electric motor control

Also Published As

Publication number Publication date
ZM16168A1 (en) 1969-06-17

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees