Device for increasing the magnetic flux density in the vicinity of a hall sensor cooperating with a magnet wheel
First Claim
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1. A device for measuring the rotation speed or detecting the direction of rotation of a rotary magnetic field, comprising:
- a rotating rotor spindle;
a magnet wheel secured on said rotor spindle, said magnet wheel having a permanent magnet with magnet poles for generating a rotary magnetic field, said poles disposed in a radial plane perpendicular to said rotor spindle;
a printed circuit board disposed approximately perpendicular to said rotor spindle for receiving an electronic circuit;
a Hall sensor secured as an integrated component on said printed circuit board, said Hall sensor having a sensor surface extended parallel to said printed circuit board; and
a magnetic flux guide element of high permeability disposed in the vicinity of said magnet wheel and substantially perpendicular to said sensor surface of said Hall sensor, for deflecting the magnetic field of said magnet wheel in an axial direction to increase magnetic flux density in the vicinity of said Hall sensor, said magnetic flux guide element extending in an axial direction along an imaginary longitudinal axis and disposed so that the axis passes through said surface of said Hall sensor.
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Abstract
A device for measuring the rotation speed or detecting the direction of rotation of a rotary magnetic field includes a Hall sensor which is mounted as an SMD component on a printed circuit board. A magnet wheel is secured to a rotor spindle of an electric motor and a rotary magnetic field is generated upon its rotation. A magnetic flux guide element is provided for concentrating the rotary magnetic field in the region of the Hall sensor, thereby increasing the sensitivity of the Hall sensor.
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Citations
5 Claims
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1. A device for measuring the rotation speed or detecting the direction of rotation of a rotary magnetic field, comprising:
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a rotating rotor spindle; a magnet wheel secured on said rotor spindle, said magnet wheel having a permanent magnet with magnet poles for generating a rotary magnetic field, said poles disposed in a radial plane perpendicular to said rotor spindle; a printed circuit board disposed approximately perpendicular to said rotor spindle for receiving an electronic circuit; a Hall sensor secured as an integrated component on said printed circuit board, said Hall sensor having a sensor surface extended parallel to said printed circuit board; and a magnetic flux guide element of high permeability disposed in the vicinity of said magnet wheel and substantially perpendicular to said sensor surface of said Hall sensor, for deflecting the magnetic field of said magnet wheel in an axial direction to increase magnetic flux density in the vicinity of said Hall sensor, said magnetic flux guide element extending in an axial direction along an imaginary longitudinal axis and disposed so that the axis passes through said surface of said Hall sensor. - View Dependent Claims (2, 3, 4, 5)
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Specification
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Current AssigneeContinental Automotive GmbH (Continental AG)
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Original AssigneeSiemens AG
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InventorsKostler, Werner, Jager, Heimo
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Primary Examiner(s)PATIDAR, JAY M
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Application NumberUS08/906,183Time in Patent Office897 DaysField of Search324/207.2, 324/207.23, 324/207.25, 324/207.26, 324/166, 324/167, 324/173, 324/174, 324/175, 324/165, 338/32 HUS Class Current324/165CPC Class CodesG01P 3/487 delivered by rotating magnetsH02K 23/66 Structural association with...
