Overview
IEC 60404-17:2021 is an international standard developed by the International Electrotechnical Commission (IEC) that specifies methods for measuring the magnetostriction characteristics of grain-oriented electrical steel strip and sheet. Using a single sheet tester combined with an optical sensor, this standard ensures precise and reliable determination of magnetostriction under AC magnetic fields at typical industrial frequencies of 50 Hz or 60 Hz. It focuses primarily on materials defined in IEC 60404-8-7, providing standardized procedures essential for consistent evaluation and comparison of magnetic materials used in electrical engineering applications.
Key Topics
- Measurement Principles: The standard outlines the general principles of magnetostriction measurement, emphasizing the use of sinusoidal induced secondary voltage and controlled magnetic polarization.
- Test Apparatus Setup: Detailed descriptions of essential components such as yokes, windings, clamps, optical sensors, and air flux compensation are provided to ensure test consistency and accuracy.
- Magnetostriction Characteristics: It covers critical parameters including the butterfly loop, peak-to-peak magnetostriction value (λp-p), and zero-to-peak magnetostriction value (λ0-p).
- Measurement Procedures: Step-by-step guidelines for preparing specimens, adjusting power supplies, and conducting measurements are included to maintain reproducibility and reliability.
- Reproducibility and Calibration: Requirements for managing frictional forces, vibration suppression, and external noise isolation are discussed, alongside methods for apparatus calibration to ensure test validity.
Applications
IEC 60404-17:2021 is pivotal for manufacturers, researchers, and quality control laboratories working with grain-oriented electrical steel used in electrical machines, transformers, and other electromagnetic devices. Key applications include:
- Transformer Acoustic Design: Measurement data on magnetostriction directly supports efforts to reduce transformer noise by correlating magnetostriction strain with vibration and sound levels.
- Material Selection and Development: Standardized magnetostriction measurement helps in comparing steel grades and optimizing materials for improved magnetic performance and reduced operational noise.
- Quality Control: Consistent characterization of magnetostrictive behavior assists in verifying compliance with material specifications and detecting production variations.
- Research and Innovation: The standard facilitates advanced studies on magnetostrictive effects under varying magnetic and mechanical conditions, including compressive stresses, as detailed in annexes.
Related Standards
- IEC 60404-8-7: Defines specifications for grain-oriented electrical steel strip and sheet, providing complementary material classification essential for applying IEC 60404-17:2021.
- IEC 60404 Series: Covers broader magnetic materials measurement techniques, offering a holistic framework for evaluating magnetic properties in electrical steels and related alloys.
- ISO/IEC Directives: Provide the procedural and editorial guidelines followed for developing IEC 60404-17:2021, ensuring international consensus and publication quality.
By adhering to IEC 60404-17:2021, stakeholders gain access to a robust, internationally accepted methodology for the accurate and repeatable measurement of magnetostriction characteristics, thereby enhancing the performance and reliability of electrical steel applications in modern electrotechnology.
Open preview (PDF)Magnetic materials - Part 17: Methods of measurement of the magnetostriction characteristics of grain-oriented electrical steel strip and sheet by means of a single sheet tester and an optical sensor
