JPS54122174A - Sensor for detecting number of revolutions of motors - Google Patents
Sensor for detecting number of revolutions of motorsInfo
- Publication number
- JPS54122174A JPS54122174A JP3008678A JP3008678A JPS54122174A JP S54122174 A JPS54122174 A JP S54122174A JP 3008678 A JP3008678 A JP 3008678A JP 3008678 A JP3008678 A JP 3008678A JP S54122174 A JPS54122174 A JP S54122174A
- Authority
- JP
- Japan
- Prior art keywords
- detecting element
- magnetism detecting
- level
- revolving shaft
- distance
- 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
Landscapes
- Linear Or Angular Velocity Measurement And Their Indicating Devices (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
PURPOSE: To detect the number of revolutions of a motor by providing a permanent magnet and a magnetism detecting element in the position spaced at a fixed distance from a revolving shaft.
CONSTITUTION: A magnetism detecting element 3 such as Hall 1C is disposed in the position spaced at a specified distance from a revolving shaft 1 and a permanent magnet 2 such as anisotropic Mn-A magnet is provided on the back of said magnetism detecting element 3. Arrangement is so made that as the revolving shaft 1 revolves the opposing side face of an eccentric balancer 4 goes closer to or away from the magnetism detecting element 3. If the closest distance thereof is let to be l1 and the furthest distance to be l2, then it turns out that the magnetic flux density B gauss to the magnetism detecting element 3 changes with respect to its displacement. Here, the magnetism detecting element 3 changes over its output from L level to H level when the magnetic flux density is below B1 and from H level to L level if above B2. Hence, one pulse signal per revolution of the revolving shaft 1 is outputted.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3008678A JPS54122174A (en) | 1978-03-15 | 1978-03-15 | Sensor for detecting number of revolutions of motors |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3008678A JPS54122174A (en) | 1978-03-15 | 1978-03-15 | Sensor for detecting number of revolutions of motors |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54122174A true JPS54122174A (en) | 1979-09-21 |
Family
ID=12293977
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3008678A Pending JPS54122174A (en) | 1978-03-15 | 1978-03-15 | Sensor for detecting number of revolutions of motors |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54122174A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5742958U (en) * | 1980-08-26 | 1982-03-09 | ||
JPH0712559U (en) * | 1993-08-04 | 1995-03-03 | 山口電機工業株式会社 | Rotation detection sensor device for construction machinery vehicles |
-
1978
- 1978-03-15 JP JP3008678A patent/JPS54122174A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5742958U (en) * | 1980-08-26 | 1982-03-09 | ||
JPS6122288Y2 (en) * | 1980-08-26 | 1986-07-04 | ||
JPH0712559U (en) * | 1993-08-04 | 1995-03-03 | 山口電機工業株式会社 | Rotation detection sensor device for construction machinery vehicles |
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