IEC 62317-7-2005 pdf – Ferrite cores – Dimensions – Part 7: EER-cores.
1 Scope This part of IEC 62317 specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of EER-cores made of ferrite, the essential dimensions of coil formers to be used with them, and the effective parameter values to be used in calculations involving them. 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 referenced document (including any amendments) applies. IEC 60205:2001, Calculation of the effective parameters of magnetic piece parts IEC 62358:2004, Ferrite cores – Standard inductance factor (A L ) and its tolerance 3 Primary standards Compliance with the following requirements ensures mechanical interchangeability of complete assemblies and coil formers. 3.1 Dimensions of EER-cores 3.1.1 Principal dimensions The principal dimensions of EER-cores are given in Table 1. The dimensions of the cores may be checked by means of gauges. By way of example, a possible standard for these gauges is given in Annex B. In order to facilitate production, it may be necessary to use gauges having dimensions differing from those given in Annex B, although no relaxation of the requirements for the dimensions of the cores given in Table 1 is permitted. The dimensions specified in Table 1 are illustrated in Figure 1. 3.1.2 Effective parameter and A min values The effective parameter values of a pair of cores whose dimensions comply with 3.1.1 shall be as given in Table 2. 3.2 Dimensional limits for coil formers The essential dimensions of coil formers suitable for use with a pair of EER-cores shall be as given in Table 3. The dimensions specified in Table 3 are illustrated in Figure 2.