JPS5495347A - Appartus for preventing burning of motor field coil - Google Patents

Appartus for preventing burning of motor field coil

Info

Publication number
JPS5495347A
JPS5495347A JP203178A JP203178A JPS5495347A JP S5495347 A JPS5495347 A JP S5495347A JP 203178 A JP203178 A JP 203178A JP 203178 A JP203178 A JP 203178A JP S5495347 A JPS5495347 A JP S5495347A
Authority
JP
Japan
Prior art keywords
field
current
field coil
coil
relay
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
JP203178A
Other languages
Japanese (ja)
Inventor
Yoshio Sakai
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 JP203178A priority Critical patent/JPS5495347A/en
Publication of JPS5495347A publication Critical patent/JPS5495347A/en
Pending legal-status Critical Current

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  • Protection Of Generators And Motors (AREA)

Abstract

PURPOSE: To permit prevention of the field coil in case of occurrence of a trouble in a field control coil by using a field coil current detection relay, which is turned on when a field coil current exceeds a predetermined value and is turned off when the current becomes lower than the predetermined value, for disconnecting the power source.
CONSTITUTION: A motor field coil 2 of an elevator drive motor is connected to a thyristor converter 1, and a command field current and the actural field current are compared to control the thyristors 19 and 20. When obtaining a constant field current, a fault detection relay 27 is excited with the operation of a field current detection relay 21 and an instantaneous field loss detection relay 22, thus disconnecting a power source 16 with a switch 24a of a relay 24. Thus, in case when the field current is not reduced even with the operation of a relay 13a for controlling the field current to the REST current, it is detected to disconnect the power source 16 of the converter 1, so that burning of the motor field coil can be prevented by merely providing a simple circuit.
COPYRIGHT: (C)1979,JPO&Japio
JP203178A 1978-01-13 1978-01-13 Appartus for preventing burning of motor field coil Pending JPS5495347A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP203178A JPS5495347A (en) 1978-01-13 1978-01-13 Appartus for preventing burning of motor field coil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP203178A JPS5495347A (en) 1978-01-13 1978-01-13 Appartus for preventing burning of motor field coil

Publications (1)

Publication Number Publication Date
JPS5495347A true JPS5495347A (en) 1979-07-27

Family

ID=11517954

Family Applications (1)

Application Number Title Priority Date Filing Date
JP203178A Pending JPS5495347A (en) 1978-01-13 1978-01-13 Appartus for preventing burning of motor field coil

Country Status (1)

Country Link
JP (1) JPS5495347A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56156331U (en) * 1980-04-21 1981-11-21

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52154059A (en) * 1976-06-18 1977-12-21 Hitachi Ltd Protective device for dc motor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52154059A (en) * 1976-06-18 1977-12-21 Hitachi Ltd Protective device for dc motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56156331U (en) * 1980-04-21 1981-11-21

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