Stator Assembly Torque Measurement Coupling

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Solution Overview

Problem

Existing stator assemblies in power steering systems face challenges in easy coupling to stator holders, which affects the accuracy of torque measurement and assistant steering force determination due to frictional resistance and magnetic field detection.

Innovation Solution

The stator assembly is directly coupled to the stator holder using protrusions that are fusion-welded by heat or ultrasonic waves, eliminating the need for additional coupling parts and ensuring stability during torque measurement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a magnet is coupled to a steering handle and a stator is coupled to a stator holder through additional coupling parts, then the torque measuring device can function, but the device complexity increases and manufacturing cost increases

Engineering Contradiction:

Improvetorque measurement reliabilityVSAvoidcoupling structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The invention merges the stator and stator holder into a single integrated structure where the stator is directly formed on the stator holder as an integral component. This eliminates the need for separate coupling parts while maintaining the functional relationship between the stator and stator holder, thereby reducing device complexity and manufacturing cost while preserving torque measurement reliability

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The stator holder is designed to serve multiple functions: it provides structural support, acts as a mounting base for the stator, and integrates the coupling function through its direct formation of the stator. This multi-functionality reduces the number of separate components needed in the torque measuring device

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If a magnet is coupled to a steering handle and a stator is coupled to a stator holder through additional coupling parts, then the torque measuring device can function, but manufacturing cost increases

Engineering Contradiction:

Improvetorque measurement reliabilityVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The stator holder is designed to self-form the stator structure through its own geometry and material properties, eliminating the need for external coupling parts. The stator holder serves itself as both the mounting structure and the stator support, reducing manufacturing steps and costs

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 solution enhances the accuracy of torque measurement and reduces manufacturing costs by providing a secure and stable coupling between the stator and stator holder, improving the overall performance of the power steering system.

Implementation Method 1

protrusions that are fusion-welded by heat or ultrasonic waves

Methodology Applied

Scientific EffectHeat fusion welding: Welding

Implementation Method 2

protrusions that are fusion-welded by heat or ultrasonic waves

Methodology Applied

Scientific EffectUltrasonic welding: Ultrasonic Vibration

Implementation Method 3

torque is measured by detecting a magnetic field according to a difference between a rotational angle of the magnet coupled to the input shaft and a rotational angle of the stator coupled to the stator holder

Methodology Applied

Scientific EffectMagnetic field detection: Magnetic Field

Data Source

PatentEP2618122B1Stator assembly and torque measuring device

Publication Date: 2019.06.26 LG INNOTEK CO LTD

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AI summary

A stator assembly comprising: a stator holder (210); a first stator (310) which includes a first body (311) having a ring shape and a plurality of first teeth (313) bent from an inner circumferential surface of the first body (311) and spaced apart from each other, wherein the plurality of first teeth (313) are coupled to an upper portion of the stator holder (210); a second stator (310) which includes a second body (311) having a ring shape and a plurality of second teeth (313) bent from an inner circumferential surface of the second body (311) and spaced apart from each other, wherein the plurality of second teeth (313) are coupled to a lower portion of the stator holder (210), wherein the plurality of first teeth (313) are alternately aligned with the plurality of second teeth (313); a plurality of protrusions (213) making contact with both side surface of each tooth of the first stator (310), wherein the plurality of protrusions covers the plurality of first teeth (313).