Hall Element Rotation Angle Sensor Temperature Correction via Magnetic Flux Density Segmentation

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Solution Overview

Problem

Existing rotation angle detecting devices using Hall elements face challenges in accurately correcting temperature characteristics when the magnetic flux density differs from a specific set value, making it difficult to maintain precise measurements.

Innovation Solution

The method involves dividing magnetic flux density into multiple grade ranges and setting specific temperature correction values for each range, using a defined correction value α(t) to adjust the output voltage of Hall elements, allowing for accurate temperature characteristic correction across varying magnetic flux densities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If temperature characteristic correction is performed using a single specific magnetic flux density value, then the correction is simple, but the accuracy deteriorates when the actual magnetic flux density differs from the specific value

Engineering Contradiction:

Improvesimplicity of correction methodVSAvoidtemperature characteristic correction accuracy

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The magnetic flux density range is divided into multiple grade ranges (first grade range, second grade range, etc.), and different temperature correction values are set for each range. This segmentation allows the system to maintain simple correction procedures while achieving high accuracy across varying magnetic flux density conditions by selecting the appropriate correction value based on the current grade range.

Inventive Principle:

Principle #1Segmentation

2Measurement precision

If multiple temperature correction values are set for different magnetic flux density ranges, then the correction accuracy is improved, but the device complexity increases

Engineering Contradiction:

Improvetemperature characteristic correction accuracyVSAvoidcomplexity of correction system

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Different temperature correction values are assigned to different magnetic flux density grade ranges based on the specific characteristics of each range. This local quality approach ensures that each region of the magnetic flux density spectrum has its own optimized correction parameters, achieving high accuracy without requiring a completely complex system architecture.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system dynamically selects the appropriate temperature correction value based on the current magnetic flux density grade range. This dynamic adaptation allows the correction system to remain simple in structure while achieving high accuracy by adjusting the correction parameters according to operating conditions.

Inventive Principle:

Principle #15Dynamics

3Device complexity

If a single temperature correction value is used for all magnetic flux densities, then the device complexity is low, but the reliability deteriorates when operating conditions vary

Engineering Contradiction:

Improvesimplicity of correction systemVSAvoidreliability of rotation angle detection

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

By segmenting the magnetic flux density range into multiple grade ranges and assigning appropriate temperature correction values to each, the system maintains operational simplicity while ensuring reliable rotation angle detection across varying magnetic flux density conditions. Each grade range has its own optimized correction parameters that ensure accurate operation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically adapts to varying operating conditions by selecting the appropriate temperature correction value based on the current magnetic flux density grade range, thereby maintaining high reliability without requiring a complex fixed correction system.

Inventive Principle:

Principle #15Dynamics

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 approach enables precise correction of temperature characteristics for Hall elements, ensuring accurate rotation angle detection regardless of the magnetic flux density, thereby enhancing the reliability of the rotation angle detecting device.

Implementation Method 1

The Hall elements are arranged to rotate relative to the permanent magnet as a rotating object rotates, so that the output voltage of the Hall elements is generated in response to change in magnetic flux density

Methodology Applied

Scientific EffectHall effect: Hall Effect

Data Source

PatentUS7583078B2Rotation angle detecting device and method of correcting temperature characteristic of the same

Publication Date: 2009.09.01 DENSO CORP

AI summary

A method of correcting temperature characteristic of a rotation angle detecting device that includes a permanent magnet, a magnetic core, a Hall element that rotates relative to the permanent magnet when a rotating object rotates to provide an output signal. The method includes a step of setting temperature correction values for correcting a temperature characteristic of the rotation angle detecting device according to magnetic flux density. The magnetic flux density is divided into a plurality of grade ranges and the temperature correction values are respectively set for the grade ranges.