Linear Motor Magnetic Sensor Positioning for Interference Reduction

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Solution Overview

Problem

Existing linear motor units experience external disturbances and inaccuracies due to the proximity of magnetic sensors from adjacent linear motors, leading to potential malfunctions and incorrect position detection during the transfer and mounting of electronic components.

Innovation Solution

The linear motor unit is designed with magnetic sensors positioned in mutually different locations along the moving direction of the movable element, ensuring a large opposing distance between them to prevent external disturbances and erroneous detection, while using alternate arrangements of first and second linear motors with distinct magnetic sensor regions to avoid magnetic field interactions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If magnetic sensors are positioned close to each other in adjacent linear motors, then the device size is reduced, but external disturbances and measurement errors occur

Engineering Contradiction:

Improvedevice sizeVSAvoidposition detection accuracy

Core Design Contradiction:

Volume of moving objectVSMeasurement precision

Solution Approach 1:

The patent positions magnetic sensors at different locations along the moving direction (longitudinal dimension) rather than only separating them in the lateral direction. This dimensional approach allows compact lateral arrangement while maintaining sufficient distance to avoid magnetic field interference, thus reducing device size without compromising measurement precision.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent assigns different positional characteristics to magnetic sensors in adjacent linear motors along the moving direction. By creating local positional differentiation, each sensor operates in a distinct magnetic field zone, avoiding interference while maintaining overall compact device structure.

Inventive Principle:

Principle #3Local quality

2Reliability

If magnetic sensors are positioned at different locations along the moving direction, then external disturbances are avoided, but the device complexity increases

Engineering Contradiction:

Improveposition detection reliabilityVSAvoidsensor arrangement complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent divides the magnetic sensor arrangement into segmented positions along the moving direction for adjacent linear motors. This segmentation creates clear spatial separation of sensor zones, reducing magnetic field interference and improving reliability while maintaining manageable system complexity through systematic positioning.

Inventive Principle:

Principle #1Segmentation

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 effectively prevents external disturbances and ensures accurate position detection of the movable element, enhancing the precision and reliability of electronic component transfer and mounting processes by minimizing interference between adjacent magnetic sensors.

Implementation Method 1

a magnetic sensor that can detect a position of the movable element

Methodology Applied

Scientific EffectMagnetic field detection: Magnetic Field

Data Source

PatentEP2259412B1Linear motor unit and electronic component transfer device equipped with linear motor unit

Publication Date: 2017.10.25 YAMAHA MOTOR CO LTD

AI summary

One aspect of the present invention relates to a linear motor unit including a plurality of linear motors, each having a stator, a movable element that linearly reciprocates along the stator, and a magnetic sensor that can detect a position of the movable element, wherein the magnetic sensors of the adjacent linear motors are disposed so as to be placed in mutually different positions in a moving direction of the movable element.