[특허]Magnetoresistive encoder for tracking the angular position of a rotating ferromagnetic target wheel

Magnetoresistive encoder for tracking the angular position of a rotating ferromagnetic target wheel 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01B-007/30 H01L-043/08
출원번호	US-0262097 (1994-06-20)
발명자 / 주소	Schroeder Thaddeus Lequesne Bruno Patrice Bernard Yamasaki Hiro
출원인 / 주소	Hughes Aircraft Company
대리인 / 주소	Conkey
인용정보	피인용 횟수 : 40 인용 특허 : 0

초록 ▼

An apparatus for detecting precise angular positions of a rotating object. Two magnetoresistors (MRs) are positioned adjacent a target wheel attached to the rotating object, the target wheel having at least one element of finite length. Each MR is responsive to the passage of at least one of the elements as the target wheel is rotated, generating an analog signal with signal transitions between two voltage levels at the passage of the element's leading and trailing edges. The MRs are positioned relative to the elements such that their signals are phase shifted with respect to one another, resulting in time overlapping signals which intersect at a precise angular positions of the target wheel.

대표청구항 ▼

[ The embodiments of this invention in which an exclusive property or privilege is claimed are defined as follows:] [1.] An encoder for sensing angular positions of a rotating target wheel, comprising:teeth, separated by slots, angularly spaced around the periphery of the target wheel; anda sensor including (a) a biasing magnet, (b) a first magnetic field sensing element positioned adjacent the periphery of the target wheel, responsive to the passage of the teeth and slots, and providing a first output that transitions between first and second levels at the passage of each leading and trailing edge of each tooth as it passes adjacent to the first magnetic field sensing element and (c) a second magnetic field sensing element positioned adjacent the periphery of the target wheel, responsive to the passage of the teeth and slots, and providing a second output that transitions between third and fourth levels at the passage of each leading and trailing edge of each tooth as it passes adjacent to the second magnetic field sensing element,the positions of first and second magnetic field sensing elements having a predetermined spacing different from the spacing between the leading and trailing edges of the teeth so that leading edges of the teeth are positioned adjacent one of the first and second magnetic field sensing elements at a predetermined angle of rotation of the target wheel after trailing edges of the teeth are positioned adjacent the other one of the first and second magnetic field sensing elements, the predetermined angle having a value so that the first and second outputs have simultaneous equal values during transitions of the first and second outputs, the simultaneous outputs occurring at precise angular positions of the target wheel.

이 특허를 인용한 특허 (40)

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Lee, Davin Robert, Contactless rotary pull switch.
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Becker, David L., Contactless vehicle lamp switch.
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Thaddeus Schroeder, Crankshaft position sensor.
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Schroeder Thaddeus, Differential magnetic position sensor with adaptive matching for detecting angular position of a toothed target wheel.
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Krefta Ronald John ; Walters James E., High-resolution incremental position sensor with pulse switching strategy.
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Schroeder Thaddeus ; Butler ; Jr. Raymond O. ; Lequesne Bruno Patrice Bernard, Low cost binary encoded crankshaft position sensor.
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Schroeder Thaddeus, Low cost single magnetoresistor position and speed sensor.
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Shinjo Izuru,JPX ; Hatazawa Yasuyoshi,JPX ; Hiraoka Naoki,JPX ; Ohashi Yutaka,JPX, Magnetic detecting apparatus with giant magnetoresistive sensing element and level shifting waveform processing circuit.
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Robert Herman Luetzow ; Kenneth Brown, Magnetic incremental motion detection system and method.
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Thaddeus Schroeder, Magnetic position sensor system composed of two reference magnetoresistors and a linear displacement sensing magnetoresistor.
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Luetzow, Robert H.; Brown, Kenneth A., Magnetic sensing device with offset compensation.
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Thaddeus Schroeder, Magnetoresistive die and position sensor.
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Aoyama Seiki,JPX ; Makino Yasuaki,JPX ; Kuroyanagi Susumu,JPX ; Shoji Izuru,JPX ; Izawa Ichiro,JPX, Magnetoresistive type position sensor having bias magnetic and magnet resistance elements in bias magnetic field thereof.
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Schroeder Thaddeus, Magnetoresistor array.
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Thaddeus Schroeder, Magnetoresistor die composed of two reference mangetoresistors and a linear displacement sensing magnetoresistor.
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Thaddeus Schroeder, Magnetoresistor sensor die with an array of MRs.
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Lindstrom Jeffrey V. ; Reed R. David ; Platin Bradley E. ; Beyer Kevin W. ; Reusch David C., Method and apparatus for detecting skew and asymmetry of an airplane flap.
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Gester,Matthias, Method and apparatus for measuring movement, displacement and/or deformation.
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Block, Ruediger; Andriot, Christelle; Rettig, Rasmus; Walter, Klaus, Method and assembly for determining rational speed with variable switching hysteresis.
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Schroeder,Thaddeus; Chang,Shih Chia; Rodriguez,Lorenzo Guadalupe, Method for forming permanent magnet targets for position sensors.
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Schroeder Thaddeus ; Perry Thomas Arthur ; Meyer Martin Stephen ; Lequesne Bruno Patrice Bernard, Method of matching magnetoresistors in a sensor assembly.
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Schroeder Thaddeus, Method of matching sensors to crankshafts and camshafts.
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Frederick,Gary L.; Rose,Richard A., Methods and apparatus for sensing angular position and speed of a rotatable shaft utilizing linearized annular magnet and commutated ratiometric hall sensors.
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Cheng,James, Phase detector for rotating equipment.
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Vladimir Vladimirovich Zharski BY; Nickolai Kalistratovich Trusov BY, Position sensor for armature of step magnetoelectric motor.
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Schroeder,Thaddeus; Chang,Shih Chia; Rodriguez,Lorenzo Guadalupe, Printed high strength permanent magnet targets for magnetic sensors.
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Ramirez, Claudia, Rotary magnetic position sensor having pole differentiated magnets.
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Daniel J. Moreno ; Yingjie Lin, Self compensating control circuit for digital magnetic sensors.
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Godoy, Arquimedes; Parada, Aida I., Speed and angular position sensing assembly.
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Yingjie Lin ; Warren Baxter Nicholson ; Steven Douglas Thomson, Steering column differential angle position sensor.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

Magnetoresistive encoder for tracking the angular position of a rotating ferromagnetic target wheel 원문보기

초록 ▼

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Magnetoresistive encoder for tracking the angular position of a rotating ferromagnetic target wheel 원문보기

초록 ▼

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연구과제 타임라인

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이 특허를 인용한 특허 (40)

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