Magnetic angular position sensor

A magnetic field sensor and sensor technology, applied in the direction of converting sensor output, using electric/magnetic devices to transfer sensing components, instruments, etc., can solve problems such as uneven interference magnetic field, measurement error, and difficulty in eliminating influence

Active Publication Date: 2017-09-01
INFINEON TECH AG
View PDF10 Cites 26 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

BLDC motors present a challenging environment for magnetic field sensors because they typically include strong rotating magnets and copper windings carrying high currents, both of which generate a time-varying magnetic field that interferes

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Magnetic angular position sensor
  • Magnetic angular position sensor
  • Magnetic angular position sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] Embodiments described herein relate to magnetic field sensors for use in magnetic angular position sensors having an on-axis arrangement of sensor elements relative to the rotational axis of a magnet or shaft. In one embodiment, the magnetic angular position sensor is mounted in an on-axis configuration relative to the rotatable shaft. The shaft includes an end which may consist of a soft magnetic material or a permanent magnet. The end of the shaft may have a front surface that faces the sensor and is rotationally asymmetric with respect to the axis of rotation of the shaft. The sensor comprises at least three magnetic field sensor elements arranged in a plane substantially perpendicular to the axis of rotation. Circuitry coupled to the magnetic field sensor elements is configured to estimate the rotational position of the shaft by combining signals of the at least three magnetic field sensor elements. While numerous applications exist for various embodiments of sens...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a magnetic angular position sensor. A magnetic angular position sensor system is described herein. According to one exemplary embodiment the angular position sensor system comprises a shaft rotatable around a rotation axis, wherein the shaft has a soft magnetic shaft end portion. The system further comprises a sensor chip spaced apart from the shaft end portion in an axial direction and defining a sensor plane, which is substantially perpendicular to the rotation axis. At least four magnetic field sensor elements are integrated in the sensor chip, wherein two of the magnetic field sensor elements are spaced apart from each other and are only sensitive to magnetic field components in a first direction and two of the magnetic field sensor elements are spaced apart from each other and are only sensitive to magnetic field components in a second direction, and therefore the first and the second direction are mutually non-parallel and the first and second directions are perpendicular to the rotation axis.

Description

technical field [0001] The present invention relates generally to angular position sensors utilizing magnetic field sensors to measure angular values, and more particularly to on-axis angular position sensors, systems and methods having various applications, including in brushless direct current (DC) motors application. Background technique [0002] Magnetic field sensors can be used to sense the angular position of a shaft or other object. For example, a permanent magnet may be mounted on the shaft, and a magnetic field sensor may be arranged proximate to the magnet to sense the magnetic field generated by the magnet as it rotates with the shaft. When a magnetic field sensor is mounted close to the shaft at a specific distance from the axis of rotation of the shaft, the sensor is often referred to as an "off-axis" magnetic angular position sensor. Off-axis magnetic angular position sensors are often implemented when the front side of the shaft is not accessible (eg due to...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01B7/30G01D5/20G01R33/06H02P6/16
CPCG01B7/30G01D5/20G01R33/06H02P6/16G01D5/145G01D5/24442G01D2205/60G01B7/00G01D5/12G01D5/2006
Inventor U.奥瑟莱希纳
Owner INFINEON TECH AG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap