Patent
Temperature stable proximity sensor with sensing of flux emanating from the lateral surface of a magnet
Ronald J Wolf,Larry Hedeen +1 more
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TLDR
A ferrous object sensor assembly as mentioned in this paper consists of a permanent magnet and a magnetic flux responsive sensor having a sensing plane which produces an electrical output signal which varies as a function of the change in magnetic flux density.Abstract:
A ferrous object sensor assembly is capable of sensing the presence or absence of an object of high magnetic permeability, such as a tooth or notch on a rotatably mounted ferrous wheel at zero speed and immediately upon power-up and, thus, may also be used as a proximity sensor. The ferrous object sensor assembly is comprised of a permanent magnet and a magnetic flux responsive sensor having a sensing plane which produces an electrical output signal which varies as a function of the change in magnetic flux density. The ferrous body sensor assembly does not rely upon pole face magnetism as some known conventional sensors but, rather, relies upon a the radial component of magnetic flux density emanating from a lateral surface of the magnet, intermediate opposing pole faces. Since the ferrous object sensor assembly does not rely on pole face magnetism, its electrical output signal is relatively stable over a relatively wide temperature range.read more
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Patent
Contactless linear angular position sensor having an adjustable flux concentrator for sensitivity adjustment and temperature compensation
Ronald J Wolf,Larry Hedeen +1 more
TL;DR: An angular position sensor for sensing the angular position of a pivotally mounted device includes a magnetically sensitive device, such as a Hall effect IC, and a plurality of flux concentrators, rigidly disposed relative to the Hall Effect IC, forming an assembly as discussed by the authors.
Patent
Mechanically adjustable linear-output angular position sensor
Ronald J Wolf,Larry Hedeen +1 more
TL;DR: An angular position sensor for sensing the angular position of a pivotally mounted device includes a magnetically sensitive device, such as a Hall effect IC, and a plurality of flux concentrators, rigidly disposed relative to the Hall Effect IC, forming an assembly as mentioned in this paper.
Patent
Packaged integrated circuit with magnetic flux concentrator
TL;DR: A flux concentrator made of a high permeability material is enclosed in a semiconductor package with a magnetic sensing integrated circuit to improve the uniformity and magnitude of the magnetic field sensed by the sensor as discussed by the authors.
Patent
Dual-element proximity sensor for sensing the direction of rotation of a ferrous target wheel
TL;DR: In this paper, a dual-element sensor assembly is adapted to be utilized with a two-channel ferrous target, a target wheel having ferrous targets that are axially separated to correspond to the two channel sensor assembly.
Patent
Asymmetrical magnetic position detector
TL;DR: In this paper, a gear tooth sensor is provided which incorporates a magnet and two magnetically sensitive devices, such as Hall effect elements, in a common plane with each other with one of the devices being located at a position closer to the magnet than the other device.
References
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Patent
Hall effect displacement transducer using a bar magnet parallel to the plane of the Hall device
TL;DR: A Hall effect device and apparatus for providing a response in accordance to displacement of a movable stylus or plunger and the method of making the same is described in this article.
Patent
Hall effect apparatus for determining the angular position of a rotating part
TL;DR: In this paper, the angular position of a rotating part is determined by a Hall effect element disposed on the axis of the rotating part, where the first and second elements are made of a soft magnetic material which are angularly displaced so as to alternately pass by the first magnet and the second magnet, respectively, to produce oppositely directed transverse magnetic field components.
Patent
Ferromagnetic article detector with dual Hall-sensors
TL;DR: In this article, identical integrated circuit (IC) chips are mounted at a pole of a magnet and a comparator is connected to the outputs of the IC chips to produce a voltage that is directly related to the difference between the magnetic field strengths at the two IC chips that may be due to a ferromagnetic article that is closer to one IC chip than the other.
Patent
Interleaved magnetoresistive displacement transducers
TL;DR: Magnetoresistive displacement transducers as discussed by the authors have been used for both linear and rotary motion detection in magnetic toothed magnetic members in which each transducers is formed by a pair of interconnected sections spaced from each other by the width of a tooth to provide greater change and improved symmetry in the output signal at the tooth edges.
Patent
Device for measuring a position of a moving object
Abe Kunihiro,Yoshihiko Morimoto +1 more
TL;DR: In this paper, a Hall IC for measuring the position of a moving body is presented, where a detected member made of magnetic material is secured to the moving body and an E-shaped magnet is arranged adjacent the measured member transverse to the direction of motion.