WO1991002983A1 - Flux concentrator for magnetic sensors - Google Patents
Flux concentrator for magnetic sensors Download PDFInfo
- Publication number
- WO1991002983A1 WO1991002983A1 PCT/EP1990/001319 EP9001319W WO9102983A1 WO 1991002983 A1 WO1991002983 A1 WO 1991002983A1 EP 9001319 W EP9001319 W EP 9001319W WO 9102983 A1 WO9102983 A1 WO 9102983A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensing element
- cavity
- disposed
- magnet
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
- G01P1/02—Housings
- G01P1/026—Housings for speed measuring devices, e.g. pulse generator
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/487—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by rotating magnets
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
Definitions
- This invention relates to an improvement in a magnetic wheel speed sensor.
- Magnetic wheel speed sensors are utilized in automotive vehicle wheels to provide electrical signals representing wheel speed.
- a magnet 0 that is polarized at regular circumferential intervals rotates with the wheel.
- the magnetic flux issued by the magnet acts upon a sensor, such as a Hall device, that is mounted stationarily adjacent the wheel.
- the magnetic flux passing through the sensor is 5 caused to vary and as a result the sensor produces a similarly varying electrical output signal. It is only a certain fraction of the flux that actually acts upon the sensor because the remainder of the flux goes astray.
- a Hall device is responsive to the intensity of the o magnetic flux passing through it, and therefore in a wheel speed sensing system there must be a suitable • flux intensity acting upon the device in order for the device to produce a suitable output signal. Accordingly, the magnetomotive force of the magnet, the clearance between 5 the magnet and the Hall device, and the ability to concentrate the flux onto the device are important factors in assuring that a suitable output signal can be developed. The closer the Hall device is to the magnet, the larger the magnetic flux acting on the device; the greater the magnetomotive force of the magnet, the greater the magnetic flux acting on the device. Unfortunately, part manufacturing tolerances limit how small the running clearance between the magnet and the Hall device can be, and more powerful magnets are more costly.
- the present invention relates to an improvement for concentrating the magnetic flux on the Hall device while still providing a construction for the sensor that is conducive to economy in manufacture and to satisfactory life and performance in use.
- the invention either makes the running clearance between the magnet and the Hall device less critical for a given magnet strength or else makes the magnet strength less critical for a given running clearance between the magnet and the Hall device.
- the senor is constructed of a magnetically non-conductive housing having a cavity containing a pocket within which the Hall device is disposed.
- the device is captured within the pocket by means of a potting compound disposed within the housing cavity.
- Interspersed throughout the potting compound are fragments of magnetically conductive material, such as ferromagnetic filings, chips, powder, flakes, or the like. Such material aids in concentrating the magnetic flux on the Hall device.
- Fig. 1 is a plan view of a sensor embodying principles of the invention.
- Fig. 2 is a cross sectional view taken in the direction of arrows 2-2 in Fig. 1. DESCRIPTION OF THE PREFERRED EMBODIMENT
- the wheel speed sensor 10 comprises a plastic housing 12 containing a cavity 14.
- the radially inner wall of the 5 housing has a small rectangular pocket 16 that is contiguous with cavity 14.
- the Hall device has terminations 20 shaped to make connection to wires 22 of a sheathed electric cable
- a metal backing plate 26 for mounting the sensor stationarily on an automotive vehicle adjacent a wheel is joined with housing 12 in a secure and permanent manner.
- the senor is so mounted, it is disposed radially outwardly of a part of the wheel that contains an annular magnet which is magnetically polarized at regular circumferential intervals.
- the magnet is represented diagrammatically in Fig. 1 by a partial showing of the
- Hall device 18 As the wheel rotates, an alternating magnetic flux is imposed on Hall device 18, and the Hall device generates a corresponding output signal that is delivered via cable 24 to a conventional circuit into which the Hall device is
- the Hall device is captured within pocket 16, and enclosed, by means of a conventional potting compound 28 having thermal characteristics compatible with the material of housing
- the potting compound however contains ferromagnetic fragments 30 interspersed throughout. It is these fragments that aid in concentrating the magnetic flux toward Hall device 18.
- a flat ferromagnetic concentrator piece 32 is disposed flat against the back surface of the Hall device's body.
- the potting compound also encapsulates the concentrator piece as well as the terminations 20 and that portion of cable 24 that is within cavity 14. The assembled parts are thereby held and protected in a secure and permanent manner.
- the sensor possesses the advantages and benefits that were enumerated earlier.
- the ferromagnetic fragments are, of course, mixed into the potting compound prior to filling the housing cavity with the mixture.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP90913820A EP0489111B1 (en) | 1989-08-21 | 1990-08-10 | Flux concentrator for magnetic sensors |
DE69009062T DE69009062T2 (en) | 1989-08-21 | 1990-08-10 | FLOW CONCENTRATING DEVICE FOR MAGNETIC SENSORS. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US396,593 | 1989-08-21 | ||
US07/396,593 US4965517A (en) | 1989-08-21 | 1989-08-21 | Flux concentrator for magnetic sensors |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991002983A1 true WO1991002983A1 (en) | 1991-03-07 |
Family
ID=23567876
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1990/001319 WO1991002983A1 (en) | 1989-08-21 | 1990-08-10 | Flux concentrator for magnetic sensors |
Country Status (4)
Country | Link |
---|---|
US (1) | US4965517A (en) |
EP (1) | EP0489111B1 (en) |
DE (1) | DE69009062T2 (en) |
WO (1) | WO1991002983A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4201328A1 (en) * | 1992-01-20 | 1993-07-22 | Teves Metallwaren Alfred | SENSOR |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0489506A (en) * | 1990-08-02 | 1992-03-23 | Mitsubishi Electric Corp | Angle detector |
DE4103947A1 (en) * | 1991-02-09 | 1992-08-20 | Aeg Sensorsysteme Gmbh | Magnetic field strength detector for machine part position measurement - has Hall sensor with connections fed via lead-through filters to exterior of sensor housing |
US5184069A (en) * | 1991-12-03 | 1993-02-02 | Ntn Technical Center, (U.S.A.) Inc. | Rotational speed sensor utilizing magnetic ink tone ring |
EP0559265B1 (en) * | 1992-02-27 | 1997-05-14 | Koninklijke Philips Electronics N.V. | Position sensor system |
US5278498A (en) * | 1992-11-06 | 1994-01-11 | The United States Of America As Represented By The Secretary Of The Navy | Surface conforming flexible eddy current probe for scanning varying surface contours |
DE19617680A1 (en) * | 1996-05-03 | 1997-11-06 | Teves Gmbh Alfred | Circuit arrangement and device for detecting the rotational behavior of a wheel |
DE10116019B4 (en) * | 2001-03-30 | 2007-12-27 | Robert Bosch Gmbh | Sensor and method for its production |
US6909281B2 (en) | 2002-07-03 | 2005-06-21 | Fisher Controls International Llc | Position sensor using a compound magnetic flux source |
WO2004076980A1 (en) * | 2003-02-21 | 2004-09-10 | Fisher Controls International Llc | Magnetic position sensor with integrated hall effect switch |
US7882852B2 (en) * | 2004-05-04 | 2011-02-08 | Woodward Hrt, Inc. | Direct drive servovalve device with redundant position sensing and methods for making the same |
DE102004022622B4 (en) * | 2004-05-07 | 2013-09-12 | Robert Bosch Gmbh | Magnetic sensor arrangement and a method for its production |
US7095193B2 (en) * | 2004-05-19 | 2006-08-22 | Hr Textron, Inc. | Brushless DC motors with remote Hall sensing and methods of making the same |
US20120249128A1 (en) * | 2011-03-28 | 2012-10-04 | GM Global Technology Operations LLC | Magnetic sensor system |
KR102116147B1 (en) | 2014-03-06 | 2020-05-28 | 매그나칩 반도체 유한회사 | Buried Magnetic Sensor |
KR102282640B1 (en) | 2014-11-24 | 2021-07-27 | 주식회사 키 파운드리 | Method for manufacturing of Semiconductor Device Having a Buried Magnetic Sensor |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4376915A (en) * | 1981-03-30 | 1983-03-15 | Dart Controls, Inc. | Tachometer |
US4502853A (en) * | 1983-02-22 | 1985-03-05 | Diesel Kiki Co., Ltd. | Rotational speed sensor for vane compressors |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3225293A (en) * | 1964-02-20 | 1965-12-21 | Fenton M Wood | Apparatus for inspecting pipe for defects |
US4555120A (en) * | 1983-10-07 | 1985-11-26 | Kelsey-Hayes Co. | Position sensor |
EP0164057A3 (en) * | 1984-06-08 | 1988-05-04 | Mecapec S.A. | Methods and devices for determining surface defects in a rod-shaped ferromagnetic object |
CH659168GA3 (en) * | 1985-04-16 | 1987-01-15 | ||
JPH07113551B2 (en) * | 1986-07-21 | 1995-12-06 | ティーディーケイ株式会社 | Tilt sensor |
US4916394A (en) * | 1989-02-27 | 1990-04-10 | Scan Systems, Inc. | Device for adjustable mounting of magnetic sensing coils used in pipe inspection |
-
1989
- 1989-08-21 US US07/396,593 patent/US4965517A/en not_active Expired - Fee Related
-
1990
- 1990-08-10 WO PCT/EP1990/001319 patent/WO1991002983A1/en not_active Application Discontinuation
- 1990-08-10 EP EP90913820A patent/EP0489111B1/en not_active Revoked
- 1990-08-10 DE DE69009062T patent/DE69009062T2/en not_active Revoked
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4376915A (en) * | 1981-03-30 | 1983-03-15 | Dart Controls, Inc. | Tachometer |
US4502853A (en) * | 1983-02-22 | 1985-03-05 | Diesel Kiki Co., Ltd. | Rotational speed sensor for vane compressors |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4201328A1 (en) * | 1992-01-20 | 1993-07-22 | Teves Metallwaren Alfred | SENSOR |
US5585560A (en) * | 1992-01-20 | 1996-12-17 | Alfred Teves Metallwarenfabrik Gmbh & Co. Ohg | Sealed movement sensor |
Also Published As
Publication number | Publication date |
---|---|
DE69009062T2 (en) | 1994-11-17 |
DE69009062D1 (en) | 1994-06-23 |
EP0489111A1 (en) | 1992-06-10 |
EP0489111B1 (en) | 1994-05-18 |
US4965517A (en) | 1990-10-23 |
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