Standard Test Method for Magnetic Properties of High-Coercivity Permanent Magnet Materials Using Hysteresigraphs

Importancia y uso:

4.1 This test method is suitable for magnet specification, acceptance, service evaluation, quality control in magnet production, research and development, and design.

4.2 When a test specimen is cut or fabricated from a larger magnet, the magnetic properties measured on it are not necessarily exactly those of the original sample, even if the material is in the same condition. In such instances, the test results must be viewed in context of part performance history.

4.3 Tests performed in general conformity to this test method and even on the same specimen, but using different test systems, may not yield identical results. The main source of discrepancies are variations between the different test systems in the geometry of the region surrounding the sample, such as, size and shape of the electromagnet pole caps (see Annex A1 and Appendix X1), air gaps at the specimen end faces, and especially the size and location of the measuring devices for H and B or for their corresponding flux values (Hall-effect probes, inductive sensing coils). Also important is the method of B calibration, for example, a volt-second calibration of the fluxmeter alone versus an overall system calibration using a physical reference sample. The method of B and H sensing should be indicated in test reports (see Section 9).

Subcomité:

A06.01

Referida por:

A1054-16R22, A0773_A0773M-21, A1102-19, B0886-24, A1070-16R22, A1101-23, A0341_A0341M-16R22

Volúmen:

03.07

Número ICS:

29.030 (Magnetic materials)

Palabras clave:

coercive field strength; coercivity; hysteresigraphs; induction; magnetic; magnetic materials; magnetic tests; permanent magnets; permeameters; remanence;