JPS5577392A - Controller for induction motor - Google Patents

Controller for induction motor

Info

Publication number
JPS5577392A
JPS5577392A JP15154078A JP15154078A JPS5577392A JP S5577392 A JPS5577392 A JP S5577392A JP 15154078 A JP15154078 A JP 15154078A JP 15154078 A JP15154078 A JP 15154078A JP S5577392 A JPS5577392 A JP S5577392A
Authority
JP
Japan
Prior art keywords
phase
sequence
current
negative
positive
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
JP15154078A
Other languages
Japanese (ja)
Inventor
Takeyoshi Kajita
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP15154078A priority Critical patent/JPS5577392A/en
Publication of JPS5577392A publication Critical patent/JPS5577392A/en
Pending legal-status Critical Current

Links

Landscapes

  • Control Of Ac Motors In General (AREA)
  • Stopping Of Electric Motors (AREA)

Abstract

PURPOSE: To reduce the cost of a controller, by connecting impedance elements in series with controlled rectifier block groups for applying a positive-phase-sequence voltage and a negative-phase-sequence voltage to an electric motor.
CONSTITUTION: When a complete phase short circuit takes place, namely, when a positive-phase-sequence and a negative-phase-sequnce thyristor block groups 3, 4 are simultaneously closed, a short-circuit current flows throughout the period of at least one wave of power. Since current-limiting reactors 10, 11 are copuled in series with the negative-phase-sequence thyrsitor block group 4, the short-circuit current is suppressed below the overcurrent strength of thyristors. An abnormal current is detected by current transformers 12, 13. A current feedback signal is applied to a turn-on unit 7 to block thyristor gates to cut off a dynamic current. An overcurrent due to a cause except for the simultaneous closing of the positive-phase- sequence and negative-phase-sequence thyristor block groups 3, 4 does not exceed the overcurrent strength of the thyristors because a short circuit takes place through impedances as far as there is no wrong connection.
COPYRIGHT: (C)1980,JPO&Japio
JP15154078A 1978-12-07 1978-12-07 Controller for induction motor Pending JPS5577392A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15154078A JPS5577392A (en) 1978-12-07 1978-12-07 Controller for induction motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15154078A JPS5577392A (en) 1978-12-07 1978-12-07 Controller for induction motor

Publications (1)

Publication Number Publication Date
JPS5577392A true JPS5577392A (en) 1980-06-11

Family

ID=15520738

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15154078A Pending JPS5577392A (en) 1978-12-07 1978-12-07 Controller for induction motor

Country Status (1)

Country Link
JP (1) JPS5577392A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61176999U (en) * 1985-04-23 1986-11-05
JPH0564491A (en) * 1991-12-04 1993-03-12 Meidensha Corp Inverter control method for induction mot0r

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61176999U (en) * 1985-04-23 1986-11-05
JPH0564491A (en) * 1991-12-04 1993-03-12 Meidensha Corp Inverter control method for induction mot0r

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