JPS6486069A - Method for diagnosing abnormality of rotational speed detector of electric motor - Google Patents

Method for diagnosing abnormality of rotational speed detector of electric motor

Info

Publication number
JPS6486069A
JPS6486069A JP24251187A JP24251187A JPS6486069A JP S6486069 A JPS6486069 A JP S6486069A JP 24251187 A JP24251187 A JP 24251187A JP 24251187 A JP24251187 A JP 24251187A JP S6486069 A JPS6486069 A JP S6486069A
Authority
JP
Japan
Prior art keywords
delay time
rotational speed
speed detector
electric motor
actual
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
JP24251187A
Other languages
Japanese (ja)
Inventor
Kunio Tabei
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.)
JFE Steel Corp
Original Assignee
Kawasaki Steel 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 Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP24251187A priority Critical patent/JPS6486069A/en
Publication of JPS6486069A publication Critical patent/JPS6486069A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To restore the trouble of a rotational speed detector at an early stage, by diagnosing the abnormal state of the rotational speed detector of an electric motor on-line on the basis of a delay time. CONSTITUTION:A rotational speed detector 4 is connected to the rotary shaft 1a of a DC electric motor 1. A delay time comparator 9 compares the logical circuit speed N0 operated by a rotational speed operation circuit 8 with the actual rotational speed N obtained by linearily converting the output signal of the rotational speed detector 4 by a linear signal converter 6c to measure the actual delay time TD before the actual rotational speed N reaches the logical circuit speed N0. Further, the upper limit delay time TM set and inputted by a delay time upper limit setting device 12 is compared with the actual delay time TD by the delay time comparator 9. As the result of comparison, when the delay time TD exceeds the upper limit delay time TM, it is judged that the speed detector 4 is abnormal and, therefore, the delay time comparator 9 outputs an alarm signal to an alarm circuit 10 to emit the abnormality alarm of the rotational speed detector 4.
JP24251187A 1987-09-29 1987-09-29 Method for diagnosing abnormality of rotational speed detector of electric motor Pending JPS6486069A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24251187A JPS6486069A (en) 1987-09-29 1987-09-29 Method for diagnosing abnormality of rotational speed detector of electric motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24251187A JPS6486069A (en) 1987-09-29 1987-09-29 Method for diagnosing abnormality of rotational speed detector of electric motor

Publications (1)

Publication Number Publication Date
JPS6486069A true JPS6486069A (en) 1989-03-30

Family

ID=17090190

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24251187A Pending JPS6486069A (en) 1987-09-29 1987-09-29 Method for diagnosing abnormality of rotational speed detector of electric motor

Country Status (1)

Country Link
JP (1) JPS6486069A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6229565B1 (en) 1997-08-15 2001-05-08 Howard H. Bobry Hand-held electronic camera with integral printer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6229565B1 (en) 1997-08-15 2001-05-08 Howard H. Bobry Hand-held electronic camera with integral printer

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