Soft Magnetic Sensor Package Interference Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Magnetic angle sensors face measurement errors due to soft magnetic materials, which are prone to magnetization by external interference fields, leading to angle errors when used with ferrous shafts, as existing systems struggle to distinguish between the magnetized shaft and the magnetic field produced by the sensor.
Innovation Solution
A measurement arrangement is designed with a first soft magnetic element and a second soft magnetic element, where the second element is strategically positioned to counteract the distortion caused by the first element, using a gradiometric principle to compensate for interference fields by arranging sensor elements between the two soft magnetic elements and a magnetic field-producing element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If soft magnetic materials are used in magnetic angle sensors, then the sensors can be used with ferrous shafts, but measurement errors occur due to magnetization by external interference fields
Solution Approach 1:
The patent converts the harmful effect of soft magnetic materials being magnetized by external interference fields into a beneficial compensation mechanism. By deliberately introducing additional soft magnetic elements that generate compensating magnetic fields, the system transforms the vulnerability to interference into an active cancellation mechanism, where the same magnetic properties that cause errors are used to generate corrective fields that restore measurement accuracy.
Solution Approach 2:
The patent introduces soft magnetic compensation elements as intermediary components between the external interference fields and the sensor elements. These intermediaries actively manipulate the magnetic field distribution to counteract the distorting effects of shaft magnetization, serving as a mediating layer that protects the measurement process from harmful external influences while maintaining compatibility with ferrous shafts.
2Measurement precision
If a magnetic element produces a magnetic field for angle detection, then angle measurement is enabled, but interference fields cause axial components that reduce measurement accuracy
Solution Approach 1:
The patent transforms the harmful axial interference field components into a compensatable phenomenon by using additional soft magnetic elements that generate opposing magnetic fields. The same magnetic field interactions that produce harmful axial components are harnessed to create corrective fields, converting the measurement error source into a self-correcting mechanism that actively eliminates the interference.
Solution Approach 2:
The patent applies preliminary anti-action by pre-positioning soft magnetic compensation elements that generate magnetic fields opposing the expected interference fields before measurements are taken. These compensation elements are strategically arranged to create counteracting magnetic influences that neutralize the harmful axial components before they can significantly degrade the 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 reduces axial components of interference fields by at least 30%, effectively minimizing angle errors and ensuring accurate angle detection even with soft magnetic shafts, by counteracting the influence of external interference fields on the sensor arrangement.
Implementation Method 1
a magnetic element which is mechanically coupled to the first soft magnetic element and is designed to produce a magnetic field
Implementation Method 2
a sensor arrangement for capturing the magnetic field, which sensor arrangement is arranged in such a manner that a relative movement between the first soft magnetic element and the sensor arrangement results in a change in the magnetic field at the location of the sensor arrangement
Implementation Method 3
influencing the magnetic field at the location of the sensor arrangement in a symmetrical manner with respect to the first soft magnetic element and based on the sensor arrangement by means of a second soft magnetic element
Data Source
AI summary
A measurement arrangement includes a first soft magnetic element, a second soft magnetic element, a magnetic element which is mechanically coupled to the first soft magnetic element and is configured to produce a magnetic field, and a sensor arrangement for capturing the magnetic field, which sensor arrangement is arranged in such a manner that a relative movement between the first soft magnetic element and the sensor arrangement results in a change in the magnetic field at the location of the sensor arrangement. The sensor arrangement is configured to determine the change. The sensor arrangement and the magnetic element are arranged between the first soft magnetic element and the second soft magnetic element.