JPS6486069A - Method for diagnosing abnormality of rotational speed detector of electric motor - Google Patents
Method for diagnosing abnormality of rotational speed detector of electric motorInfo
- 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
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.
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)
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 |
-
1987
- 1987-09-29 JP JP24251187A patent/JPS6486069A/en active Pending
Cited By (1)
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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