JPS5794A - Overload protecting device of winding type induction motor - Google Patents

Overload protecting device of winding type induction motor

Info

Publication number
JPS5794A
JPS5794A JP7137780A JP7137780A JPS5794A JP S5794 A JPS5794 A JP S5794A JP 7137780 A JP7137780 A JP 7137780A JP 7137780 A JP7137780 A JP 7137780A JP S5794 A JPS5794 A JP S5794A
Authority
JP
Japan
Prior art keywords
motor
torque
load
over
induction motor
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.)
Pending
Application number
JP7137780A
Other languages
Japanese (ja)
Inventor
Tadahiko Kanbara
Akiharu Yagyu
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.)
Hitachi Engineering Co Ltd
Hitachi Ltd
Original Assignee
Hitachi Engineering Co Ltd
Hitachi 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 Hitachi Engineering Co Ltd, Hitachi Ltd filed Critical Hitachi Engineering Co Ltd
Priority to JP7137780A priority Critical patent/JPS5794A/en
Publication of JPS5794A publication Critical patent/JPS5794A/en
Pending 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)

Abstract

PURPOSE:To lower cost by eliminating necessity of providing an over-load protection exclusive circuit, by providing a secondary resistance control circuit of a motor having an over-load protective characteristic. CONSTITUTION:Current of a main circuit 1 of an induction motor 9 is detected by CT 3, the voltage conversion is made by a converter 5, and to the respective sensitivity areas of an over current protecting relays 4 of different characteristics, a command is given to a forward-reversal commanding device 7 or 8 of a control motor 13 which changes resistance value of a liquid resistor 12. Depending on magnitude of load torque at this time, the motor 9 becomes nonoperative at the point of exceeding the output limit torque of the motor. And therefore, by driving the control motor 13 at the point where the output torque is smaller than the output limit torque of the motor, resistance value of the liquid resistor 12 is changed, and load torque of the motor 9 is controlled.
JP7137780A 1980-05-30 1980-05-30 Overload protecting device of winding type induction motor Pending JPS5794A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7137780A JPS5794A (en) 1980-05-30 1980-05-30 Overload protecting device of winding type induction motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7137780A JPS5794A (en) 1980-05-30 1980-05-30 Overload protecting device of winding type induction motor

Publications (1)

Publication Number Publication Date
JPS5794A true JPS5794A (en) 1982-01-05

Family

ID=13458742

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7137780A Pending JPS5794A (en) 1980-05-30 1980-05-30 Overload protecting device of winding type induction motor

Country Status (1)

Country Link
JP (1) JPS5794A (en)

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