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Demagnetizing Field Robust, Torsion Sensitive Magnetic Speed ​​Sensor

A magnetic sensor and sensor element technology, applied in the direction of converting the sensor output, devices and instruments using electric/magnetic methods, etc., can solve the problems that the sensor cannot detect the teeth or notches, and the differential signal cannot be obtained.

Active Publication Date: 2020-05-15
INFINEON TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case a differential signal is not available and the sensor cannot detect teeth or notches

Method used

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  • Demagnetizing Field Robust, Torsion Sensitive Magnetic Speed ​​Sensor
  • Demagnetizing Field Robust, Torsion Sensitive Magnetic Speed ​​Sensor
  • Demagnetizing Field Robust, Torsion Sensitive Magnetic Speed ​​Sensor

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Embodiment Construction

[0025] In the following, numerous details are set forth in order to provide a more comprehensive description of the exemplary embodiments. It will be apparent, however, to one skilled in the art that the embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form or schematically rather than in detail in order to avoid obscuring the embodiments. Furthermore, features of different embodiments described hereinafter may be combined with each other, unless the context clearly indicates otherwise.

[0026] Further, equivalent or similar reference numerals are used in the following descriptions to denote equivalent or similar elements or elements having equivalent or similar functions. Since identical or functionally equivalent elements are given the same reference numerals in the drawings, repeated description of elements provided with the same reference numerals may be omitted. Therefore, desc...

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Abstract

Magnetic sensor modules, systems and methods are provided, configured to detect a rotation of an object. A magnetic sensor module includes an axially polarized back bias magnet that generates a radially symmetric bias magnetic field about a center axis of the axially polarized back bias magnet in a sensor plane, and a magnetic sensor including a plurality of sensor elements arranged in the sensor plane of the magnetic sensor and are configured to generate measurement values in response to sensing the radially symmetric bias magnetic field. The plurality of sensor elements are arranged on a circumference of a circle at equidistant angles about the center axis of the axially polarized back bias magnet. The plurality of sensor elements are grouped into a plurality of pairs such that each pair has a sensitivity axis sensitive to a different in-plane magnetic field component of the radially symmetric bias magnetic field.

Description

technical field [0001] The present disclosure relates generally to sensing wheel speed, and more particularly to magnetic speed sensors. Background technique [0002] For measuring wheel speed (for example in automotive applications) ferromagnetic wheels are often used in combination with magnetically sensitive sensors and magnets mounted to the sensors. The sensor generates output pulses. The control unit counts the pulses and is able to calculate the wheel speed and true angle of the rotating wheel. [0003] In cam sensing applications, a Hall monocell configuration can be used, which enables an output that switches at the tooth edge of a gear. A z-magnetized back-biased sensor combined with a Bz-sensitive single-element sensor produces a sinusoidal signal as the iron target wheel rotates in front of the sensor. Maximum amplitude is achieved when the tooth passes through the sensor, and minimum signal is achieved when the sensor faces the notch of the gear. Consequentl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P3/44
CPCG01P3/44G01D5/147G01P3/487G01D5/248
Inventor G·宾德
Owner INFINEON TECH AG