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Standards Development
The purpose of this part of IEC 60404 is to define the general principle and technical details of the methods of measurement of the steady state magnetic properties of permanent magnet materials in an open magnetic circuit using a Pulsed Field Magnetometer (PFM).
This method is applicable to permanent magnet materials, such as those specified in IEC 60404 -8- 1, the properties of which are presumed homogeneous throughout their volume.
This document also specifies methods to correct the influence of the demagnetizing field in the test specimen on the demagnetization curve obtained in an open magnetic circuit. The PFM rapidly measures the test specimen via magnetic response of a test specimen in a pulsed magnetic field. Conse-quently, additional correction may be required to remove the influence of eddy currents generated in the test specimen. This document also specifies when such eddy current corrections should be applied. The mag-netic properties are determined from a corrected demagnetization curve.
The purpose of this standard is to ensure standards by which PFMs must perform in an international marketplace.
Permanent magnets are key to many environmental and industrial applications. With the advent of Electric Vehicles there is a rapidly growing need to accurately measure high coercivity magnets. This cannot be achieved accurately with electromagnet methods. The PFM process has become popular in China, Japan, and Europe.
The process of working toward an international standard was first commenced in 2000 and resulted in TR 62331 in 2005, a Round Robin Test a few years later. During this time the use of the PFM technique has grown rapidly, but without the benefit of an Inter national Standard. This NWI is intended to address this.
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