This part of GB/T 12796 specifies the quality assessment procedure, sectional specification, test items and measuring methods selected for blank detail specification as well as relevant units, symbols and terms of permanent ferrite magnet (hereinafter referred to as “magnet”); rules for compiling the blank detail specification are also specified.
This part is applicable to isotropic and anisotropic magnet, including bonded magnet, of such devices as electroacoustic device, telecommunication equipment and instrument, electrical vacuum device, microwave device, small and special electrical machine, magnetic separation equipment, adsorption equipment, magnetic machine and magnetic sealing device.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the normative document (including any amendments) applies.
GB/T 2421.1-2008 Environmental Testing - General and Guidance (IEC 60068-1: 1988, IDT)
GB/T 2423.1-2008 Environmental Testing - Part 2: Test Methods - Tests A: Cold (IEC 60068-2-1: 2007, IDT)
GB/T 2423.2-2008 Environmental Testing - Part 2: Test Methods - Tests B: Dry Heat (IEC 60068-2-2: 2007, IDT)
GB/T 2423.5-1995 Environmental Testing for Electric and Electronic Products - Part 2: Test Methods - Test Ea and Guidance: Shock (Idt IEC 60068-2-27: 1987)
GB/T 2423.6-1995 Environmental Testing for Electric and Electronic Products - Part 2: Test Methods - Test Eb and Guidance: Bump (Idt IEC 60068-2-29: 1987)
GB/T 2423.10-2008 Environmental Testing for Electric and Electronic Products - Part 2: Tests Methods - Test Fc: Vibration (Sinusoidal) (IEC 60068-2-6: 1995, IDT)
GB/T 2828.1-2003 Sampling Procedures for Inspection by Attributes - Part 1: Sampling Schemes Indexed by Acceptance Quality Limit (AQL) for Lot-by-lot Inspection (ISO 2859-1: 1999, IDT)
GB 3100 The International System of Units and its Application (GB 3100-1993, Eqv ISO 1000: 1992)
GB 3101 General Principles Concerning Quantities, Units and Symbols (GB 3101-1993, Eqv ISO 31-0: 1992)
GB/T 3217-1992 Methods of Test of the Magnetic Properties of Permanent Magnetic (Magnetically Hard) Materials (Neq IEC 60404-5: 1982)
GB/T 9634 (All Parts) Ferrite Cores - Guide on the Limits of Surface Irregularities (IEC 60424, IDT)
GB/T 9637-2001 Electrotechnical Terminology - Magnetic Materials and Components (Eqv IEC 60050(221): 1990)
IEC 60027 Letter Symbols to be Used in Electrical Technology
IEC 60617 Graphical Symbols for Diagrams
IEC QC 001002 Rules of Procedure of the IEC Quality Assessment System for Electronic Components (IECQ)
3 General Technical Information
3.1 Priority order
It shall comply with the following priority order no matter what is the cause of the inconsistency between each standard.
- Detail specification;
- Sectional specification;
- Generic specification;
- Foundation specification and other reference documents.
3.2 Terms and definitions
For the purpose of this document, the following terms and definitions and those defined in GB 3100, GB 3101, GB/T 9637-2001, IEC 60027 and IEC 60617 apply.
3.2.1 Surface magnetic flux density
Bb
The magnetic flux density of the point and direction designated on the magnet surface after the magnet is magnetized to technology saturation.
3.2.2 Remanent magnetic flux density (magnetic flux)
