1. Iron powder core
The iron powder core is a popular term for the magnetic core material iron tetroxide. The main component is iron oxide. The price is relatively low. The change stability is good, the DC current superposition performance is good, but the consumption is high at high frequency.
2. Mn-Zn type: (70% Fe2O3 17% MnO 13% ZnO)
The material has strong electrical conductivity, and generally needs to be coated with insulation. The coating layer is generally green. The material is usually selected according to the characteristic requirements. For larger inductance, Mn-Zn material is usually selected, and Mn-Zn material is easy to magnetic saturation.
That is to say, IDC1 is very small. The corresponding inductance coefficient (AL value) can be found through the manufacturer’s product catalog, and then the required number of turns can be calculated through the formula L=AL.N². The characteristics of Mn-Zn materials are unstable, and the inductance range is usually determined. 30% or more!
The material is obviously affected by the external temperature and pressure, so we usually set the inductance to XXuH MIN when making this kind of samples. /1005B) to fix the BASE or partition, remember not to bake.
3. Ni-Zn ferrite
This type of material is most widely used in CHOKE inductor coils. Its main component is ferric oxide, plus a small amount of zinc oxide, nickel oxide, copper oxide, cobalt oxide and other trace elements, with stable characteristics and small variability.
Ni-Zn magnetic rings are usually not painted, and it is required to measure the impedance, that is, the Z value. Feelings are sometimes required. There are not many Ni-Zn magnetic rings used in our factory. Generally, they are BEAD types such as RH, R6H, RID, etc. The main supplier is Umag. Ni-Zn materials are sometimes used in TOROID products. Generally painted green, the same color as MN-ZN material, pay attention to distinguish.
Ni-Zn materials have high surface impedance and are electrical insulators, which are used for EMI anti-magnetic interference (low frequency low impedance, high frequency high impedance) Ni-Zn materials generally have low saturation flux density (BS) and high high coercivity (HC), can not withstand high current and hysteresis loss, has high surface impedance,
4. MPP CORES iron-nickel-molybdenum metal magnetic powder core
MPP is composed of 81% Ni, 2% Mo and Fe powder. The main features are: the saturation magnetic induction intensity value is about 7500Gs; the magnetic permeability range is large, from 14 to 550; it has the lowest loss in the powder magnetic core; excellent temperature stability, widely used in space equipment, outdoor equipment, etc.; magnetic The stretching coefficient is close to zero, and no noise is generated when working at different frequencies.
