JPS5678394A - Protecting method of induction motor - Google Patents

Protecting method of induction motor

Info

Publication number
JPS5678394A
JPS5678394A JP16196580A JP16196580A JPS5678394A JP S5678394 A JPS5678394 A JP S5678394A JP 16196580 A JP16196580 A JP 16196580A JP 16196580 A JP16196580 A JP 16196580A JP S5678394 A JPS5678394 A JP S5678394A
Authority
JP
Japan
Prior art keywords
speed
resistor
induction motor
motor
service interruption
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.)
Granted
Application number
JP16196580A
Other languages
Japanese (ja)
Other versions
JPS594960B2 (en
Inventor
Sanshiro Obara
Mitsusachi Motobe
Kosei Hori
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 JP55161965A priority Critical patent/JPS594960B2/en
Publication of JPS5678394A publication Critical patent/JPS5678394A/en
Publication of JPS594960B2 publication Critical patent/JPS594960B2/en
Expired 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
    • H02H7/0833—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 for electric motors with control arrangements

Landscapes

  • Protection Of Generators And Motors (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

PURPOSE:To protect semiconductor elements and the like restraining a secondary overvoltage generated at the recovery of service interruption by a method wherein when an AC power supply is interrupted, a resistor is automatically inserted in the secondary circuit of an induction motor. CONSTITUTION:When an induction motor is controlled in speed by forming a commutator-less motor with a synchronous motor 3 of which revolving shaft is connected with the induction motor 2 and a rectifying circuit 5, a frequency converter 7, the DC voltage and current in the rectifying circuit 5 are controlled to be zero if service interruption occurs in the power supply 1. When the turning speed of the motor drops to the lower limit of speed which is set, the dropped speed is detected with a speed detector 20, switches SW2-SW4 are opened and at the same time a switch SW1 for a secondary resistor 19 is closed and further, a breaking signal is sent out to a thyristor gate of the frequency converter 7. Accordingly, at the recovery of service interruption, the resistor 19 is in the state that it is connected to the secondary side. Therefore, the overvoltages are consumed by the secondary resistor 19 and the semiconductor elements etc. are protected.
JP55161965A 1980-11-19 1980-11-19 How to protect induction motors Expired JPS594960B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55161965A JPS594960B2 (en) 1980-11-19 1980-11-19 How to protect induction motors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55161965A JPS594960B2 (en) 1980-11-19 1980-11-19 How to protect induction motors

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP49077288A Division JPS517432A (en) 1974-07-08 1974-07-08 Judodendokino sokudoseigyohoshiki

Publications (2)

Publication Number Publication Date
JPS5678394A true JPS5678394A (en) 1981-06-27
JPS594960B2 JPS594960B2 (en) 1984-02-01

Family

ID=15745432

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55161965A Expired JPS594960B2 (en) 1980-11-19 1980-11-19 How to protect induction motors

Country Status (1)

Country Link
JP (1) JPS594960B2 (en)

Also Published As

Publication number Publication date
JPS594960B2 (en) 1984-02-01

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