A2.4 - Airgap-Dependent “Pole Eating” Effect in Magnetic Scales

Event
SMSI 2025
2025-05-06 - 2025-05-08
Nürnberg
Band
Lectures
Chapter
A2 - Magnetic and inductive Measurement
Author(s)
F. Slanovc, D. Markó, M. Ortner - Silicon Austria Labs, Villach (Austria)
Pages
40 - 41
DOI
10.5162/SMSI2025/A2.4
ISBN
978-3-910600-06-5
Price
free

Abstract

Magnetic scales and encoders are essential tools for precise measurement of linear displacement and angular rotation, especially in applications requiring long stroke lengths. However, material imperfections and errors in the magnetization process can result in inaccuracies within the magnetic zone patterns. This paper investigates the phenomenon of “pole eating”, where magnetic poles are partially diminished by neighboring poles at larger air gaps. A quantitative analysis of the impact of airgap variations on pole read-out accuracy is presented, focusing on three key error parameters: zone length variations, zone depth inconsistencies, and zone polarization irregularities. The findings provide insights into the tolerances necessary for reliable magnetic scale performance under varying air gap conditions, contributing to improved design and operational guidelines for magnetic measurement systems.

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