To achieve good performance, when making the magnetic ring inductors, it's crucial to follow standard process design specifications.

In terms of design we should notice:

1. To ensure a stable inductance, we should avoid use 15K high conductivity magnetic cores.

2. For amorphous nanocrystalline cores, request plastic case, thus core damage of external forces could be reduced during core winding.

3. The core must be epoxy coated, otherwise, the wire insulation film thickness must >0.08mm, or with case design, to prevent short circuits caused by paint film damage.

4. When use powder core for filter inductors, designer need to consider the inductance & characteristics of the powder core to ensure that the inductance attenuation under current meets the design requirements. It's necessary to clearly specify the inductance requirements under saturated current to prevent poor performance of the entire machine.

 5. For the high conductivity cores, the winding wire's diameter should ≤ 1.2mm, or wrap the core with directional film, buffer tape, or with plastic case, to avoiding poor inductance caused by stress.

6. For wire diameter >0.8mm, it' s priority to use PEW wire for peeling and tinning immersion to prevent skin explosion by direct welding&high-temperautre tin immersion, which may lead to poor pressure resistance.

7. For the inductors which wound by wire ≤0.45mm, the wire can't be used as a PIN directly.  To avoiding wire thin to breaking deforming and can't install, the  base design is request.

8. To ensure there is no breakdown or short circuit between turns of the coil under instantaneous over voltage, the wire must with excellent insulation. For multi coil inductors, it is preferred to use 1UEW (1UEW-NY) or PEW, AIW or other peeled enameled wire materials.

9. For three-layer insulated wires that require casing, priority should be given to directly welded three-layer insulated wires.

10. When design the magnetic core coils winding turns, it is necessary to ensure good mass production capacity, manual winding not exceed 30Ts, preferably to meet machine winding requirements.

11. The design of the number of turns of the magnetic ring should reserve the minimum inner diameter to ensure that the last round of wire can be smooth without mutual scratching and passing through, to prevent short circuits caused by paint film damage. The magnetic core reference winding turns as follows:

12. When there are safety regulations for the creepage distance between different windings of common mode inductors, the design must reserve space for installing isolation barriers to avoid insufficient space and damage to the paint film of the enameled wire, in order to prevent poor performance. According to the requirements of IEC60950 standard, reference as follows:

13.In order to reduce the parasitic capacitance of the coil and enhance the stability of the circuit, the coil should be wound in a single layer as much as possible.