WO2008129872A1 - Rotation detector, and bearing with rotation detector - Google Patents

Rotation detector, and bearing with rotation detector Download PDF

Info

Publication number
WO2008129872A1
WO2008129872A1 PCT/JP2008/000937 JP2008000937W WO2008129872A1 WO 2008129872 A1 WO2008129872 A1 WO 2008129872A1 JP 2008000937 W JP2008000937 W JP 2008000937W WO 2008129872 A1 WO2008129872 A1 WO 2008129872A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic
rotation detector
encoders
phase difference
sensors
Prior art date
Application number
PCT/JP2008/000937
Other languages
French (fr)
Japanese (ja)
Inventor
Shintarou Ueno
Toru Takahashi
Original Assignee
Ntn Corporation
S.N.R.Roulements S.A.
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
Priority claimed from JP2007108275A external-priority patent/JP2008267867A/en
Priority claimed from JP2007108276A external-priority patent/JP2008267868A/en
Application filed by Ntn Corporation, S.N.R.Roulements S.A. filed Critical Ntn Corporation
Publication of WO2008129872A1 publication Critical patent/WO2008129872A1/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
    • G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/007—Encoders, e.g. parts with a plurality of alternating magnetic poles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/245—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train
    • G01D5/2451—Incremental encoders
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/249—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using pulse code
    • G01D5/2497—Absolute encoders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2380/00—Electrical apparatus
    • F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

Provided are a rotation detector having a simple structure and capable of precisely detecting an absolute angle with high resolution, and a bearing with the rotation detector mounting the rotation detector. The rotation detector (1) includes: two magnetic encoders (2A, 2B) which are formed in the state of coaxial rings, and which have magnetic string patterns (2Aa, 2Ba) having mutually different numbers of magnetic poles arranged on the periphery of each magnetic encoder; and magnetic sensors (3A, 3B) each detecting the magnetic field of each of the magnetic encoders (2A, 2B). Respective magnetic sensors (3A, 3B) have a function of detectinginformation on the positions of the magnetic encoders (2A, 2B) in the magnetic poles. The rotation detector (1) includes a phase difference detection means (6) which obtains the phase difference between magnetic field signals detected by the respective magnetic sensors (3A, 3B) and an angle calculation means (7) which calculates the absolute angles of the magnetic encoders according to the detected phase difference. A gap (12) is provided between the magnetic string patterns (2Aa, 2Ba) of the two magnetic encoders (2A, 2B).
PCT/JP2008/000937 2007-04-17 2008-04-10 Rotation detector, and bearing with rotation detector WO2008129872A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2007-108275 2007-04-17
JP2007-108276 2007-04-17
JP2007108275A JP2008267867A (en) 2007-04-17 2007-04-17 Rotation detector, and bearing with the rotation detector
JP2007108276A JP2008267868A (en) 2007-04-17 2007-04-17 Rotation detector, and bearing with rotation detector

Publications (1)

Publication Number Publication Date
WO2008129872A1 true WO2008129872A1 (en) 2008-10-30

Family

ID=39875402

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2008/000937 WO2008129872A1 (en) 2007-04-17 2008-04-10 Rotation detector, and bearing with rotation detector

Country Status (1)

Country Link
WO (1) WO2008129872A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2336729A1 (en) * 2008-09-11 2011-06-22 NTN Corporation Rotation detecting device and bearing with rotation detecting device
CN102933940A (en) * 2010-06-03 2013-02-13 Ntn株式会社 Magnetic encoder
EP2649349A1 (en) * 2010-12-10 2013-10-16 Aktiebolaget SKF Encoder washer and bearing assembly comprising such a washer
WO2015081981A1 (en) * 2013-12-02 2015-06-11 Aktiebolaget Skf Encoder washer and assembly comprising such a washer
CN109910061A (en) * 2019-03-13 2019-06-21 北京金钢科技有限公司 Separate type magnetic Dual-encoder

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0658766A (en) * 1992-08-05 1994-03-04 Hitachi Ltd Absolute position detector and motor control apparatus
JPH09311053A (en) * 1996-03-19 1997-12-02 Yazaki Corp Revolution sensor
JP2002541485A (en) * 1999-04-14 2002-12-03 エス．エヌ．エール．ルールマン Bearing element with an element having a plurality of aligned sensing elements for detecting magnetic pulses emanating from a coder
JP2005156499A (en) * 2003-11-28 2005-06-16 Ntn Corp Multiple rotation absolute position detector
JP2006177897A (en) * 2004-12-24 2006-07-06 Ntn Corp Bearing device for wheel with rotation speed detector
JP2006330004A (en) * 2006-09-01 2006-12-07 Ntn Corp Magnetic encoder and bearing for wheel equipped with the same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0658766A (en) * 1992-08-05 1994-03-04 Hitachi Ltd Absolute position detector and motor control apparatus
JPH09311053A (en) * 1996-03-19 1997-12-02 Yazaki Corp Revolution sensor
JP2002541485A (en) * 1999-04-14 2002-12-03 エス．エヌ．エール．ルールマン Bearing element with an element having a plurality of aligned sensing elements for detecting magnetic pulses emanating from a coder
JP2005156499A (en) * 2003-11-28 2005-06-16 Ntn Corp Multiple rotation absolute position detector
JP2006177897A (en) * 2004-12-24 2006-07-06 Ntn Corp Bearing device for wheel with rotation speed detector
JP2006330004A (en) * 2006-09-01 2006-12-07 Ntn Corp Magnetic encoder and bearing for wheel equipped with the same

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2336729A1 (en) * 2008-09-11 2011-06-22 NTN Corporation Rotation detecting device and bearing with rotation detecting device
EP2336729A4 (en) * 2008-09-11 2012-02-29 Ntn Toyo Bearing Co Ltd Rotation detecting device and bearing with rotation detecting device
EP2778624A1 (en) * 2008-09-11 2014-09-17 NTN Corporation Rotation detecting device and bearing with rotation detecting device
CN102933940A (en) * 2010-06-03 2013-02-13 Ntn株式会社 Magnetic encoder
CN102933940B (en) * 2010-06-03 2015-07-08 Ntn株式会社 Magnetic encoder
US9250102B2 (en) 2010-06-03 2016-02-02 Ntn Corporation Magnetic encoder
EP2649349A1 (en) * 2010-12-10 2013-10-16 Aktiebolaget SKF Encoder washer and bearing assembly comprising such a washer
WO2015081981A1 (en) * 2013-12-02 2015-06-11 Aktiebolaget Skf Encoder washer and assembly comprising such a washer
CN109910061A (en) * 2019-03-13 2019-06-21 北京金钢科技有限公司 Separate type magnetic Dual-encoder

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