Magnetic Sensor Mount With Movable Yoke for Irregular Targets

Solution Overview

Problem

Existing attachment devices face challenges in maintaining a consistent magnetic attraction force when attaching acceleration sensors to measurement targets with varying shapes, as the distance between the magnet and the target object changes based on the target's shape.

Innovation Solution

An attachment device with a magnet and an attraction yoke that can displace relative to the magnet along a normal line, ensuring consistent contact and attraction to the measurement target regardless of its shape, using a base, magnet, and attraction yoke configuration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the acceleration sensor is fixed to the target object by the magnetic attraction force of the magnet, then the sensor can be attached to the target object, but the distance between the magnet and the target object changes depending on the shape of the target object making it difficult to improve the magnetic attraction force for measurement targets having various shapes

Engineering Contradiction:

Improveadaptability to various target shapesVSAvoidmagnetic attraction force

Core Design Contradiction:

Adaptability or versatilityVSForce

Solution Approach 1:

The yoke is designed to be movable relative to the magnet along the normal line of the attraction surface. This dynamic structure allows the yoke to automatically adjust its position to maintain optimal contact with target objects of various shapes, ensuring consistent magnetic attraction force regardless of the target geometry. The movable yoke compensates for shape variations by displacing to the appropriate distance from the magnet.

Inventive Principle:

Principle #15Dynamics

2Reliability

If a fixed yoke structure is used, then the device structure is simple, but the distance between the magnet and target object varies with target shape reducing measurement reliability

Engineering Contradiction:

Improvemeasurement reliabilityVSAvoiddevice structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The yoke is designed to be movable relative to the magnet along the normal line of the attraction surface. This dynamic structure allows the yoke to automatically adjust its position to maintain optimal contact with target objects of various shapes, ensuring consistent magnetic attraction force regardless of the target geometry. The movable yoke compensates for shape variations by displacing to the appropriate distance from the magnet.

Inventive Principle:

Principle #15Dynamics

3Adaptability or versatility

If the magnet distance to target object is not consistent, then various shaped targets can be attached, but the magnetic attraction force becomes unstable causing detachment or movement due to vibration

Engineering Contradiction:

Improvecompatibility with various shapesVSAvoidattachment stability

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The yoke is designed to be movable relative to the magnet along the normal line of the attraction surface. This dynamic structure allows the yoke to automatically adjust its position to maintain optimal contact with target objects of various shapes, ensuring consistent magnetic attraction force regardless of the target geometry. The movable yoke compensates for shape variations by displacing to the appropriate distance from the magnet.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The yoke acts as an intermediary component between the magnet and the target object. It transmits the magnetic attraction force from the magnet to the target object while maintaining a stable magnetic circuit. The yoke's ability to move and adapt to different target shapes ensures consistent force transmission, preventing detachment or movement due to vibration.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

The solution ensures stable attachment and maintains a strong magnetic force by adjusting to the target's shape, preventing detachment and movement due to vibration, even with varying target geometries.

Implementation Method 1

a magnet 120 having an attraction surface 121 that is attracted to the measurement target 1; and an attraction yoke 130 having an attraction end that is attracted to the measurement target 1 by a magnetic force of the magnet 120

Methodology Applied

Scientific EffectMagnetic force: Magnetism

Data Source

PatentUS20260036451A1Attachment Device And Physical Quantity Detection Device

Publication Date: 2026.02.05 SEIKO EPSON CORP

AI summary

An attachment device is a device for attaching a physical quantity sensor to a measurement target. The attachment device includes a base on which the physical quantity sensor is mounted, a magnet having an attraction surface attracted to the measurement target, and an attraction yoke having attraction ends attracted to the measurement target by the magnetic force of the magnet. The attraction yoke is a yoke that is displaced relatively to the magnet in a first direction (a z direction) along a normal line of the attraction surface to attract at least a part of the attraction surface of the magnet and the attraction ends of the attraction yoke to the measurement target.