Hall Sensor Magnet Orientation for Z-Axis Position Detection
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Solution Overview
Problem
Current measuring systems for determining the position of a transducer along the z-direction have limitations in sensitivity and accuracy due to suboptimal arrangements of magnetic sensors and permanent magnets within IC packages, leading to reduced magnetic flux density and increased noise in measurements.
Innovation Solution
A measuring system comprising a semiconductor body with a magnetic field sensor and a permanent magnet arranged on a common carrier, where the magnetic field lines are parallel to the main extension plane of the sensor, optimizing the distance between the sensor and magnet to achieve maximum sensitivity and signal strength, with the magnet positioned partially above the carrier to enhance magnetic flux in the z-direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the permanent magnet is arranged within the IC package such that the magnetic field is perpendicular to the Hall sensor, then the Hall voltage is generated without external field influence, but the sensitivity and measurement precision are reduced due to suboptimal magnetic flux density
Solution Approach 1:
The patent transitions from a perpendicular magnetic field arrangement (z-direction) to a parallel arrangement where magnetic field lines extend in the x-direction, parallel to the main extension plane of the Hall sensor. This dimensional reorientation optimizes the magnetic flux density at the sensor location, significantly improving measurement precision for position detection along the z-axis.
Solution Approach 2:
The patent optimizes the distance parameter between the permanent magnet and the Hall sensor to achieve maximum magnetic flux density at the sensor. By carefully controlling this spatial parameter and orienting the magnet's magnetic moment parallel to the sensor's sensitive direction, the system achieves enhanced sensitivity and measurement accuracy.
2Measurement precision
If the distance between the magnet and sensor is minimized to achieve high magnetic flux density, then sensitivity is improved, but the transducer cannot be detected at greater distances
Solution Approach 1:
The patent optimizes the distance parameter between the permanent magnet and the Hall sensor to achieve maximum magnetic flux density at the sensor. By carefully controlling this spatial parameter and orienting the magnet's magnetic moment parallel to the sensor's sensitive direction, the system achieves enhanced sensitivity and measurement accuracy.
Solution Approach 2:
The patent creates a localized region of high magnetic flux density at the Hall sensor position through optimized magnet-sensor spacing and parallel orientation. This local optimization ensures maximum sensitivity for detecting the transducer's position when it approaches the sensor, while the extended detection range along the z-axis is achieved through the specific geometric arrangement.
3Power
If the magnetic field lines are perpendicular to the sensor plane, then the Hall effect is generated, but the measurement signal strength is reduced due to suboptimal flux density
Solution Approach 1:
The patent transitions from a perpendicular magnetic field arrangement (z-direction) to a parallel arrangement where magnetic field lines extend in the x-direction, parallel to the main extension plane of the Hall sensor. This dimensional reorientation optimizes the magnetic flux density at the sensor location, significantly improving measurement precision for position detection along the z-axis.
Solution Approach 2:
The patent optimizes the distance parameter between the permanent magnet and the Hall sensor to achieve maximum magnetic flux density at the sensor. By carefully controlling this spatial parameter and orienting the magnet's magnetic moment parallel to the sensor's sensitive direction, the system achieves enhanced sensitivity and measurement accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration significantly enhances the sensitivity and accuracy of position detection by maximizing the magnetic flux in the z-direction, reducing noise, and ensuring a strong measurement signal only when a ferromagnetic component is present, thereby improving the overall precision of transducer positioning.
Implementation Method 1
a permanent magnet (30) for producing a magnetic field (34)... maximizing the magnetic flux in the z-direction
Implementation Method 2
at least one magnetic field sensor (22) arranged on the surface (21) of the semiconductor body... sensitive in the z-direction
Data Source
AI summary
A measuring system for determining the position of a transducer along a z-direction, having a semiconductor body having a surface, a back surface, at least one connection contact and at least one magnetic field sensor which is sensitive in the z-direction, a carrier having a front side, rear side and electrically conductive regions, a magnet for producing a magnetic field, having a first magnetic pole formed along a first surface and an axis of symmetry extending perpendicular to the first surface, wherein between at least one connection contact of the semiconductor body and at least one conductor track of the carrier, there is an electrical operative connection, the first surface of the magnet being arranged parallel to the z-direction and the axis of symmetry of the magnet being arranged perpendicular to the z-direction, the transducer having an end face facing the magnetic field sensor.