GB864755A - Improvements in and relating to control systems for electric motors - Google Patents

Improvements in and relating to control systems for electric motors

Info

Publication number
GB864755A
GB864755A GB2802156A GB2802156A GB864755A GB 864755 A GB864755 A GB 864755A GB 2802156 A GB2802156 A GB 2802156A GB 2802156 A GB2802156 A GB 2802156A GB 864755 A GB864755 A GB 864755A
Authority
GB
United Kingdom
Prior art keywords
contact
voltage
motor
rotor resistance
controlled
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
GB2802156A
Inventor
David Spencer Simons
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 GB2802156A priority Critical patent/GB864755A/en
Publication of GB864755A publication Critical patent/GB864755A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Multiple Motors (AREA)

Abstract

864,755. Control of A.C. motors. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. Sept. 13, 1957 [Sept. 13, 1956], No. 28021/56. Class 38 (3). The rate of reduction of the rotor resistance of an induction motor is controlled by a magnetic amplifier MS which is biased to provide maximum output since its control coil is supplied with a reference voltage, this voltage being opposed by a voltage dependent upon the stator or rotor currents of the motor, Fig. 2 (not shown). The premature closure of rotor resistance contactors is prevented by means of pilot relays which are operated when the voltage applied to them from the amplifier exceeds a predetermined value which corresponds to a permissible torque-value of the motor. Coil PC2 of a pilot relay is prepared for operation by closure of contact C1 (controlled by a previous relay), but the relay is operated only when a timing contact T2 is closed, at a predetermined instant, and the motor torque has fallen to a predetermined value, so that the voltage supplied by the amplifier MS is sufficient. The opening of contact PC2<SP>1</SP> and the closure of contact PC2<SP>11</SP> transfers the coil PC2 to the supply-line SL. Successive operation of similar relays PC3, PC4, PC5, removes further sections of the rotor resistance. In a modification, a liquid rotor resistance is reduced, at different rates, by an hydraulic servo device, and the change in rate is controlled by the magnetic amplifier through a solenoidoperated valve. Specification 787,652 is referred to.
GB2802156A 1956-09-13 1956-09-13 Improvements in and relating to control systems for electric motors Expired GB864755A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2802156A GB864755A (en) 1956-09-13 1956-09-13 Improvements in and relating to control systems for electric motors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2802156A GB864755A (en) 1956-09-13 1956-09-13 Improvements in and relating to control systems for electric motors

Publications (1)

Publication Number Publication Date
GB864755A true GB864755A (en) 1961-04-06

Family

ID=10268994

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2802156A Expired GB864755A (en) 1956-09-13 1956-09-13 Improvements in and relating to control systems for electric motors

Country Status (1)

Country Link
GB (1) GB864755A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3250944A (en) * 1963-02-12 1966-05-10 Square D Co Electric current-sensing time limit motor acceleration system
US3305712A (en) * 1963-04-03 1967-02-21 Westinghouse Electric Corp Plural motor acceleration and braking system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3250944A (en) * 1963-02-12 1966-05-10 Square D Co Electric current-sensing time limit motor acceleration system
US3305712A (en) * 1963-04-03 1967-02-21 Westinghouse Electric Corp Plural motor acceleration and braking system

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