Rotation Angle Sensor Initialization After Wiegand Count Drift

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Solution Overview

Problem

Uncontrolled movements of the rotor unit relative to the stator unit during transport and installation of rotation angle measuring systems can cause unintentional counting pulses in the Wiegand multiturn sensor, leading to undefined actual partial rotation count values, which is critical for the proper functioning of the system.

Innovation Solution

A method for initializing the rotation angle measuring system by setting a predefined initialization angular position, reading the actual partial rotation count value, determining the actual subsegment value, and correcting it if necessary to match the target subsegment value, ensuring a defined initial state.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the rotor unit and stator unit are constituted by separate assemblies for easier installation, then the ease of manufacture and installation is improved, but uncontrolled movements during transport and installation can trigger unintentional counting pulses causing undefined actual partial rotation count values

Engineering Contradiction:

Improveease of installationVSAvoiddefined initial state

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent applies preliminary action by performing an initialization process after installation that proactively sets the actual partial rotation count value to a defined state before the system begins normal operation. This prevents the reliability issue from affecting operational functionality, as the system corrects the undefined state caused by transport movements before use.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If the actual partial rotation count value is incremented or decremented during operation for proper functioning, then the measurement precision is improved, but the system becomes sensitive to any unintended changes in the count value during non-operational phases

Engineering Contradiction:

Improvepartial rotation count valueVSAvoidunintentional counting pulses

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful effect of unintentional counting pulses during transport into a beneficial initialization opportunity. By detecting that the system is in a non-operational state (power supply off or initialization mode), the system uses the initialization process to deliberately set the count value, transforming the problem of undefined states into a controlled setup procedure that ensures measurement precision from the start of operation.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If an initialization process is implemented to set a defined initial state, then the reliability is improved, but the initialization process complexity increases

Engineering Contradiction:

Improvedefined initial stateVSAvoidinitialization process

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The initialization process is designed to be automatically triggered when the system is first powered on or when a specific initialization command is given. The system self-determines whether initialization is needed by checking if the actual partial rotation count value is already defined, and only performs the initialization sequence when necessary. This reduces operational complexity while maintaining reliability.

Inventive Principle:

Principle #25Self-service

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 method allows for a simple and reliable initialization of the rotation angle measuring system, ensuring a correct partial rotation count value is stored after installation, thereby enhancing system functionality.

Implementation Method 1

a rotatable rotor unit which is designed to be mounted so as to rotate with the shaft and which has a plurality of permanent-magnetic excitation magnets, a stationary stator unit with a Wiegand multiturn sensor

Methodology Applied

Scientific EffectMagnetic field detection: Magnetic Field

Implementation Method 2

Wiegand multiturn sensor

Methodology Applied

Scientific EffectWiegand effect: Wiegand Effect

Data Source

PatentUS12566057B2Method for initializing an angle-of-rotation measurement system, and angle-of-rotation measurement system

Publication Date: 2026.03.03 FRABA

AI summary

A method for initializing a rotation angle measuring system. The method includes setting a predefined initialization angular position of a rotor unit relative to a stator unit, reading an actual partial rotation count value from a data storage, wherein the actual partial rotation count value indicates a number of partial rotations (360°/N) of the rotor unit relative to the stator unit, where N=2n (n=1, 2, 3 . . . ), determining an actual subsegment value from the actual partial rotation count value, wherein the actual subsegment value indicates in which (360°/N) subsegment of a full rotation the rotor unit is located relative to the stator unit, and increasing or decreasing the actual subsegment value stored in the data storage if the actual subsegment value does not match a target subsegment value which is assigned to the predefined initialization angular position.