Standard No.:	GB/T 3217-1992
English Name:	Method of tst of the magnetic properties of permanent magnetic (magnetically hard) materials
Chinese Name:	永磁(硬磁)材料磁性试验方法
Chinese Classification:	H21    Metal physical property test method
Professional Classification:	GB    National Standard
ICS Classification:	29.040.10 29.040.10    Insulating oils 29.040.10
Issued by:	CSBTS
Issued on:	1992-1-18
Implemented on:	1992-10-1
Status:	superseded
Superseded by:	GB/T 3217-2013 Permanent magnet(magnetically hard)materials—Methods of measurement of magnetic properties
Superseded on:	2013-12-2
Abolished on:	2013-12-02
Superseding:	GB 3217-1982
Language:	English
File Format:	PDF
Word Count:	5000 words
Price(USD):	150.0
Delivery:	via email in 1 business day

Methods of test of the magnetic properties of permanent magnetic (magnetically hard) materials 1 Subject content and application scope This standard specifies the methods of test of the magnetic properties of permanent magnetic (magnetically hard) materials This standard is applicable to alnico permanent magnetic, ferrite permanent magnetic, rare earth permanent magnetic and other permanent magnetic materials. 2 Normative References GB2900.4 Electrotechnical terminology - Special alloys for electrical equipment 3 Terms 3.1 demagnetization curve second or fourth quadrant of the saturated hysteresis loop this part is defined by remanence and coercivity HCB or intrinsic coercivity HCJ (see Figure 1) 3.2 Maximum BH product maximum value of the product of magnetic flux density (magnetic induction intensity) and corresponding magnetic field intensity on the demagnetization curve, with the coordinates of (BH)max point expressed by (Bd,Hd) (see Figure 1) 3.3 recoil line, recoil permeability recoil line of permanent magnetic material refers to partial hysteresis loop of a point on the demagnetization curve at recoil state, recoil permeability refers to the ratio of the average slope of recoil line to the magnetic constant (see Figure 1)

1 Subject content and application scope 2 Normative References 3 Terms 4 System of units 5 Measurement of permanent magnetic materials whose intrinsic coercivity HCJ is less than or equal to 600kA/m 6. Measurement of permanent magnetic materials with intrinsic coercivity HCJ greater than 600kA/m Annex A (Supplementary) SI units related to magnetic quantity Annex B (Supplementary) Minimum saturation magnetization field intensity of some permanent magnetic materials Annex C (Supplementary) Influence of air gap on measurement error