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eLibrary > 23/30484005 DC BS EN IEC 60404-18 Magnetic materials - Part 18: Permanent magnet (magnetically hard) materials - Methods of measurement of the magnetic properties in an open magnetic circuit using a superconducting magnet >

23/30484005 DC BS EN IEC 60404-18 Magnetic materials - Part 18: Permanent magnet (magnetically hard) materials - Methods of measurement of the magnetic properties in an open magnetic circuit using a superconducting magnet, 2023

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23/30484005 DC BS EN IEC 60404-18 Magnetic materials - Part 18: Permanent magnet (magnetically hard) materials - Methods of measurement of the magnetic properties in an open magnetic circuit using a superconducting magnet, 2023

68_757e_CD.pdf [Go to Page]
68_757_CD_CP
Draft%20Second%20CD_Open_circuit_measurement_method_Superconducting_VSM%20_202311_Clean%20tempNoteJSi [Go to Page]
FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 General principle [Go to Page]
4.1 Principle of the method
4.2 Superconducting magnet (SCM)
4.3 Magnetic field strength sensor (H sensor)
4.4 Magnetic dipole moment detection coil (M coil)
4.5 Specimen rod and moving device
4.6 Measuring devices and the data processing device
5 Test specimen
6 Preparation of measurement [Go to Page]
6.1 Measurement of volume of the test specimen
6.2 Initial magnetization of the test specimen to saturation
7 Determination of magnetic polarization [Go to Page]
7.1 Measurement of the magnetic dipole moment [Go to Page]
7.1.1 SCM-VSM method
7.1.2 SCM-Extraction method
7.2 Determination of magnetic polarization
8 Measurement of magnetic field
9 Calibration of the magnetic dipole moment detection coil (M coil)
10 Determination of demagnetization curve
11 Demagnetizing field correction [Go to Page]
11.1 General
11.2 Method A: Method using a demagnetizing factor determined by the shape of the test specimen only
11.3 Method B: Method using a demagnetizing factor determined by the shape and the magnetic susceptibility of the test specimen
11.4 Method C: Method using an inverse analysis considering the spatial distribution of the self-demagnetizing field strength in the test specimen
12 Determination of principal magnetic properties [Go to Page]
12.1 Remanent magnetic polarization Jr
12.2 Maximum energy product (BH)max
12.3 Coercivity (HcJ and HcB)
13 Reproducibility of the measurements
14 Test report
Annex A (informative) Demagnetizing field correction
Annex B (informative) Details of the demagnetizing field correction [Go to Page]
B.1 General
B.2 Symbols
B.3 Method using a demagnetizing factor determined by the shape and magnetic susceptibility of the test specimen (Method B)
B.4 Method using an inverse analysis considering the spatial distribution of the self-demagnetizing field strength in the test specimen (Method C)
Annex C (informative) VSM measurement of the test specimen at elevated temperatures
Annex D (informative) Effect of test specimen dimensions on the magnetic properties
Annex E (informative) Comparison of the magnetic properties measured with a superconducting VSM and a permeameter
Bibliography [Go to Page]

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23/30484005 DC BS EN IEC 60404-18 Magnetic materials - Part 18: Permanent magnet (magnetically hard) materials - Methods of measurement of the magnetic properties in an open magnetic circuit using a superconducting magnet, 2023

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