GB992175A - Improvements in and relating to the control of a.c. motors - Google Patents

Improvements in and relating to the control of a.c. motors

Info

Publication number
GB992175A
GB992175A GB503063A GB503063A GB992175A GB 992175 A GB992175 A GB 992175A GB 503063 A GB503063 A GB 503063A GB 503063 A GB503063 A GB 503063A GB 992175 A GB992175 A GB 992175A
Authority
GB
United Kingdom
Prior art keywords
switch
control
resistor
motor
voltage
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
GB503063A
Inventor
Karl Steimel
Floris Koppelmann
Ulrich Patzschke
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Priority to GB503063A priority Critical patent/GB992175A/en
Publication of GB992175A publication Critical patent/GB992175A/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)
  • Stopping Of Electric Motors (AREA)

Abstract

992,175. Automatic Speed and current control. LICENTIA PATENT-VERWALTUNGSG.m.b.H. Feb. 7, 1963, No.5030/63. Heading G3R. [Also in Division H2] A resistor 10 is connected through choke 5 to rectifier 4 associated with a winding of an A.C. motor, a semi-conductor switch 1 being in parallel with the resistor so that the on/off periods of the switch determine the mean current in the winding. Each conducting period of the switch may be terminated by a quenching circuit comprising a further semi-conductor switch controlling the discharge of a capacitor, a choke and a diode being used to recharge the capacitor. In other arrangements, a semi-conductor switch is connected in series with the resistor for controlling the effective external resistance value, or semi-conductor switches may be connected respectively in series and in parallel with the resistor. A capacitor suppresses voltage surges when the series switch becomes non-conductive. A three phase induction motor has its stator winding associated with reversing contactors and its rotor winding with a short-circuiting contactor. A control unit compares a reference voltage with a tachometer voltage and produces signals for controlling semiconductor devices in the rotor circuit. As shown, rectifier 16 is connected to the supply network and applies across the resistor 10 a voltage which opposes the output of rectifier 4, this opposing voltage being controlled by switch 13. Control unit 12 compares a reference signal with a signal derived from current transformer 11 to control the switch 1, whilst unit 20 compares a reference signal with a signal derived from transformer 21 to control the switch 13. The motor may be supplied from an alternator whose excitation is varied from a unit which also controls the rotor current. The motor may be adapted for pole-changing or stardelta control. The control arrangement is also effective during braking periods, when the motor operates as a generator.
GB503063A 1963-02-07 1963-02-07 Improvements in and relating to the control of a.c. motors Expired GB992175A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB503063A GB992175A (en) 1963-02-07 1963-02-07 Improvements in and relating to the control of a.c. motors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB503063A GB992175A (en) 1963-02-07 1963-02-07 Improvements in and relating to the control of a.c. motors

Publications (1)

Publication Number Publication Date
GB992175A true GB992175A (en) 1965-05-19

Family

ID=9788417

Family Applications (1)

Application Number Title Priority Date Filing Date
GB503063A Expired GB992175A (en) 1963-02-07 1963-02-07 Improvements in and relating to the control of a.c. motors

Country Status (1)

Country Link
GB (1) GB992175A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4266940A (en) 1978-03-02 1981-05-12 Yorkshire Chemicals Limited Method for dyeing acrylonitrile polymer and copolymer fibres
GB2120874A (en) * 1982-03-31 1983-12-07 Grundfos As Circulating pump

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4266940A (en) 1978-03-02 1981-05-12 Yorkshire Chemicals Limited Method for dyeing acrylonitrile polymer and copolymer fibres
GB2120874A (en) * 1982-03-31 1983-12-07 Grundfos As Circulating pump

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