JPS54122174A - Sensor for detecting number of revolutions of motors - Google Patents

Sensor for detecting number of revolutions of motors

Info

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
Application number
JP3008678A
Other languages
Japanese (ja)
Inventor
Koichi Iwanaga
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.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works 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 Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP3008678A priority Critical patent/JPS54122174A/en
Publication of JPS54122174A publication Critical patent/JPS54122174A/en
Pending legal-status Critical Current

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
JP3008678A 1978-03-15 1978-03-15 Sensor for detecting number of revolutions of motors Pending JPS54122174A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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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