JPS5759493A - Overcurrent detecting system at variable frequency controlling time - Google Patents

Overcurrent detecting system at variable frequency controlling time

Info

Publication number
JPS5759493A
JPS5759493A JP55131633A JP13163380A JPS5759493A JP S5759493 A JPS5759493 A JP S5759493A JP 55131633 A JP55131633 A JP 55131633A JP 13163380 A JP13163380 A JP 13163380A JP S5759493 A JPS5759493 A JP S5759493A
Authority
JP
Japan
Prior art keywords
motor
detecting
detection
variable frequency
detecting system
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
JP55131633A
Other languages
Japanese (ja)
Inventor
Minoru Numano
Shinichi Ogawa
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 Ltd
Original Assignee
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 Ltd filed Critical Hitachi Ltd
Priority to JP55131633A priority Critical patent/JPS5759493A/en
Publication of JPS5759493A publication Critical patent/JPS5759493A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load

Landscapes

  • Control Of Ac Motors In General (AREA)
  • Inverter Devices (AREA)

Abstract

PURPOSE:To protect a motor against an overload by varying the over current detecting level in response to the detection command. CONSTITUTION:A speed command signal 11 is added to a detection level signal of an overcurrent detection setting circuit, and is varied in response to the detection command. The overcurrent detecting characteristics is prepared by considering the characteristics of the motor current due to the rotating speed determined by the load connected to the motor and the characteristics of the allowable current due to the rotating speed of the motor, thereby suitably detecting the over-current. The prescribed function generator is added after the speed command signal 11, thereby preparing the arbitrary detecting characteristics.
JP55131633A 1980-09-24 1980-09-24 Overcurrent detecting system at variable frequency controlling time Pending JPS5759493A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55131633A JPS5759493A (en) 1980-09-24 1980-09-24 Overcurrent detecting system at variable frequency controlling time

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55131633A JPS5759493A (en) 1980-09-24 1980-09-24 Overcurrent detecting system at variable frequency controlling time

Publications (1)

Publication Number Publication Date
JPS5759493A true JPS5759493A (en) 1982-04-09

Family

ID=15062606

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55131633A Pending JPS5759493A (en) 1980-09-24 1980-09-24 Overcurrent detecting system at variable frequency controlling time

Country Status (1)

Country Link
JP (1) JPS5759493A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58108788U (en) * 1982-01-18 1983-07-25 株式会社明電舎 Overcurrent limit signal generator for PWM inverter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58108788U (en) * 1982-01-18 1983-07-25 株式会社明電舎 Overcurrent limit signal generator for PWM inverter

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