JPH0315702A - Position detector for driving cylinder - Google Patents

Position detector for driving cylinder

Info

Publication number
JPH0315702A
JPH0315702A JP15070489A JP15070489A JPH0315702A JP H0315702 A JPH0315702 A JP H0315702A JP 15070489 A JP15070489 A JP 15070489A JP 15070489 A JP15070489 A JP 15070489A JP H0315702 A JPH0315702 A JP H0315702A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
shaft
sensor
film
magnet film
driving cylinder
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
JP15070489A
Inventor
Mutsumi Harada
Yoshinori Hayashi
Toshiharu Hoshi
Shinji Kato
Original Assignee
Yamaha 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

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20Other details, e.g. assembly with regulating devices
    • F15B15/28Means for indicating the position, e.g. end of stroke
    • F15B15/2815Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2861Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using magnetic means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20Other details, e.g. assembly with regulating devices
    • F15B15/28Means for indicating the position, e.g. end of stroke
    • F15B15/2815Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2846Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using detection of markings, e.g. markings on the piston rod

Abstract

PURPOSE: To obtain a sufficient position resolution and to reduce the cost of materials by coating the surface of the shaft of a driving cylinder with a magnet film having a high coercive force, and magnetizing this film at a prescribed pitch in the axial direction of the shaft.
CONSTITUTION: A magnetic sensor 7 consists of an MR (magnetic resistance) element and is attached to the end face of a driving cylinder 5 and faces a shaft 6 with a prescribed space between them. The magnet film and a protective film are successively constituted on the surface of the shaft base material of this shaft 6, and the magnet film is magnetized at a prescribed pitch in the axial direction of the shaft 6. When the cylinder 5 is driven to move the shaft 6, an output voltage is obtained from the sensor 7 because the magnetic flux generated around the magnet film in accordance with the magnetization pitch traverses the sensor 7. Consequently, peak points and zero-crossing points of the output voltage of the sensor 7 are counted to detect the extent of movement from a reference position.
COPYRIGHT: (C)1991,JPO&Japio
JP15070489A 1989-06-14 1989-06-14 Position detector for driving cylinder Pending JPH0315702A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15070489A JPH0315702A (en) 1989-06-14 1989-06-14 Position detector for driving cylinder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15070489A JPH0315702A (en) 1989-06-14 1989-06-14 Position detector for driving cylinder

Publications (1)

Publication Number Publication Date
JPH0315702A true true JPH0315702A (en) 1991-01-24

Family

ID=15502593

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15070489A Pending JPH0315702A (en) 1989-06-14 1989-06-14 Position detector for driving cylinder

Country Status (1)

Country Link
JP (1) JPH0315702A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0685927U (en) * 1993-05-25 1994-12-13 日本トムソン株式会社 Spline bearing
JP2006525529A (en) * 2003-05-06 2006-11-09 エスアールアイ インターナショナルSRI International System and method for recording the piston rod position information on the magnetic layer on the piston rod
JP2008536145A (en) * 2005-04-13 2008-09-04 エスアールアイ インターナショナルSRI International System and method for sensing the position of the moving components magnetically
US8970208B2 (en) 2010-02-11 2015-03-03 Sri International Displacement measurement system and method using magnetic encodings

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0685927U (en) * 1993-05-25 1994-12-13 日本トムソン株式会社 Spline bearing
JP2006525529A (en) * 2003-05-06 2006-11-09 エスアールアイ インターナショナルSRI International System and method for recording the piston rod position information on the magnetic layer on the piston rod
US7737685B2 (en) 2003-05-06 2010-06-15 Sri International Compositions for a magnetically hard layer on a piston rod
JP2011095269A (en) * 2003-05-06 2011-05-12 Sri Internatl System and method for recording piston rod positional information on magnetic layer on piston rod
JP2008536145A (en) * 2005-04-13 2008-09-04 エスアールアイ インターナショナルSRI International System and method for sensing the position of the moving components magnetically
US7755350B2 (en) 2005-04-13 2010-07-13 Sri International System and method of perpendicularly magnetizing position information in a magnetically hard layer of a moving component
US8970208B2 (en) 2010-02-11 2015-03-03 Sri International Displacement measurement system and method using magnetic encodings

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