JPS55129760A - Reversing detection circuit for motor - Google Patents
Reversing detection circuit for motorInfo
- Publication number
- JPS55129760A JPS55129760A JP3682879A JP3682879A JPS55129760A JP S55129760 A JPS55129760 A JP S55129760A JP 3682879 A JP3682879 A JP 3682879A JP 3682879 A JP3682879 A JP 3682879A JP S55129760 A JPS55129760 A JP S55129760A
- Authority
- JP
- Japan
- Prior art keywords
- motor
- current
- revolutions
- electromotive force
- counter electromotive
- 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 make unnecessary special space other than the main body with a simple constitution, by detecting the state of counter electromotive force of motor and performing reversing detection.
CONSTITUTION: When a given voltage is fed to the control input V1, specified drive current flows to the motor with the current control element 2, the motor 1 is driven and current flows also to the dummy resistance 4 with the current control element 2'. In this case, the current flowing to the motor circuit A is increased or decreased in proportion to the number of revolutions since the motor 1 causes counter electromotive force according to the number of revolutions. On the other hand, the current flowing to the dummy circuit B is a given value determined with the input V1, and the current value detected with the current detection elements 3, 3' has a difference, this difference corresponds to the counter electromotive force of the motor 1 and it is detected at the differential amplifier 5. Accordingly, by suitably setting the reference voltage Vs, the lowering in the number of revolutions of the motor 1, stop and reversing can be known by discriminating the output of the comparator 6.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3682879A JPS55129760A (en) | 1979-03-30 | 1979-03-30 | Reversing detection circuit for motor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3682879A JPS55129760A (en) | 1979-03-30 | 1979-03-30 | Reversing detection circuit for motor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55129760A true JPS55129760A (en) | 1980-10-07 |
Family
ID=12480598
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3682879A Pending JPS55129760A (en) | 1979-03-30 | 1979-03-30 | Reversing detection circuit for motor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55129760A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6267462A (en) * | 1985-09-20 | 1987-03-27 | Sony Corp | Rotation detector |
-
1979
- 1979-03-30 JP JP3682879A patent/JPS55129760A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6267462A (en) * | 1985-09-20 | 1987-03-27 | Sony Corp | Rotation detector |
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