JPS5540985A - Detector for out of synchronism for synchronous motor - Google Patents

Detector for out of synchronism for synchronous motor

Info

Publication number
JPS5540985A
JPS5540985A JP11488378A JP11488378A JPS5540985A JP S5540985 A JPS5540985 A JP S5540985A JP 11488378 A JP11488378 A JP 11488378A JP 11488378 A JP11488378 A JP 11488378A JP S5540985 A JPS5540985 A JP S5540985A
Authority
JP
Japan
Prior art keywords
synchronous motor
phase
synchronism
revolution
load
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
JP11488378A
Other languages
Japanese (ja)
Inventor
Minoru Kokaji
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 JP11488378A priority Critical patent/JPS5540985A/en
Publication of JPS5540985A publication Critical patent/JPS5540985A/en
Pending legal-status Critical Current

Links

Landscapes

  • Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

PURPOSE: To avoid unnecessary stopping even if the load is greatly changed, by giving out of synchronism signal when the phase of the input current of synchronous motor is turned by one or a plurality number to the phase of power supply voltage from the special angle area to lagging direction.
CONSTITUTION: When the phase of the input current I of the synchronous motor 11 turns one revolution from the angle area A to the phase of the power input voltage V and when it is judged that this one revolution is revolution of lagging by sequentially passing through the other angle areas B and C, it can be regarded the production of out of synchronism for the synchronous motor 1, and out of synchronism signal is delivered from the AND circuit 15 to the output relay 9. Accordingly, the load of the synchronous motor is periodic and greatly changing load, unnecessary stopping due to malfunction can be avoided.
COPYRIGHT: (C)1980,JPO&Japio
JP11488378A 1978-09-18 1978-09-18 Detector for out of synchronism for synchronous motor Pending JPS5540985A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11488378A JPS5540985A (en) 1978-09-18 1978-09-18 Detector for out of synchronism for synchronous motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11488378A JPS5540985A (en) 1978-09-18 1978-09-18 Detector for out of synchronism for synchronous motor

Publications (1)

Publication Number Publication Date
JPS5540985A true JPS5540985A (en) 1980-03-22

Family

ID=14649053

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11488378A Pending JPS5540985A (en) 1978-09-18 1978-09-18 Detector for out of synchronism for synchronous motor

Country Status (1)

Country Link
JP (1) JPS5540985A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015097734A1 (en) * 2013-12-24 2015-07-02 株式会社日立産機システム Power conversion device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015097734A1 (en) * 2013-12-24 2015-07-02 株式会社日立産機システム Power conversion device

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