Magnetic Encoder Reference Mark Applicator Template

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Solution Overview

Problem

Incremental-type magnetic encoders require expensive and inconvenient external switches or additional space for user-selectable reference markers, which are not always feasible, especially when space is limited or high precision is needed.

Innovation Solution

A magnetic applicator or template with a series of magnetic marks matching the encoder scale's pitch, allowing self-alignment and automatic phase relationship, enabling the user to position a reference mark easily and efficiently by using a groove or recess on the scale or applying a magnet, ensuring accurate phase positioning without external switches or additional space.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a separate reference marker is provided for user placement, then the user can select the reference position flexibly, but additional space is required which may not be available

Engineering Contradiction:

Improvereference marker position selectionVSAvoidspace requirement

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The reference marker is merged with the scale body, forming an integrated structure where the reference marker is positioned at a specific location on the scale rather than being a separate component. This eliminates the need for additional space while maintaining user-selectable reference positions through design variations in the scale structure itself

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The scale structure is designed to serve multiple functions: it provides both the periodic scale markings for position measurement and the reference marker for initialization. The scale body itself becomes a multi-functional component that eliminates the need for separate reference marker hardware

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If external switches and associated electronics are provided for reference marker selection, then multiple reference marker positions can be selected, but the cost and device complexity increase

Engineering Contradiction:

Improvereference marker selection capabilityVSAvoidswitch and electronics requirement

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The encoder system automatically detects the reference marker position through the reading head's sensing capabilities without requiring external switches or additional electronics. The system self-configures by detecting the unique magnetic signature or position of the reference marker relative to the periodic scale markings, eliminating complex selection hardware

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The mechanical switch-based selection system is replaced with a magnetic field-based detection system. The reading head uses magnetic sensing to automatically identify the reference marker position based on the magnetic pattern on the scale, substituting mechanical switching with electromagnetic detection

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If a reference marker is applied without precise positioning, then the initialization may contain errors, but achieving high precision requires complex positioning mechanisms

Engineering Contradiction:

Improvereference marker positioning accuracyVSAvoidpositioning mechanism complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

A magnetic template is introduced as an intermediary tool during the reference marker application process. The template provides precise positioning guidance through its magnetic alignment features, ensuring the reference marker is applied at the correct position relative to the periodic scale markings without requiring complex positioning machinery

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The magnetic alignment system uses magnetic attraction and repulsion forces to automatically position the reference marker with high precision. The magnetic interaction between the template, reference marker, and scale creates self-aligning forces that ensure accurate positioning without mechanical complexity

Inventive Principle:

Principle #18Mechanical vibration

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

Enables accurate and convenient initialization of magnetic encoders with reduced costs and space requirements, ensuring precise position measurement and minimizing errors in subsequent measurements.

Implementation Method 1

self-alignment of the opposing magnetic poles of the applicator or template with those of the magnetic encoder scale

Methodology Applied

Scientific EffectMagnetic attraction: Magnetism

Data Source

PatentEP2212651B1Magnetic encoder and reference mark applicator

Publication Date: 2017.01.18 RENISHAW PLC

AI summary

A magnetic encoder scale (30) comprises a series of periodically spaced magnetic marks. A reference mark (34) is applied to the scale using an applicator or template (32), which has a feature (33) for locating the reference mark. The applicator or template (32) comprises one or more magnetic marks corresponding to the periodic scale marks, whereby the applicator or template automatically assumes a defined phase relationship relative to the periodic scale marks when placed on the scale. The reference mark may be attached to the scale self-adhesively. Or it may be formed by removal of material from the scale, guided by the applicator or template. Or the applicator may comprise a strong permanent magnet which applies further magnetisation to a region of the scale.