If an inductor of X mH is being incorporated in an LC / LCL filter, what should be the core type assuming that the carrier frequency of sine pwm would be around 4 kHz?
Will it be a ferrite type core or CRGO? Why?
Undoubtedly, it is low loss Ferrite core for any inductor LC filters. Being ferromagnetic group, it has higher permeability.
@B Koti Reddy sir
But then the inverter would be supplying power at a frequency 50/60 Hz. Then for such high permeability there would be very low eddy current losses. Also at low frequencies, the time of magnetisation is relatively high and it may so happen that the magnitude of magnetisation would cross its peak leading to core saturation. How are you justifying that Ferrite core is used rather than CRGO?
- It for sure is not CRGO. I mean, the laminations of this material cannot be made thin enough to get low enough eddy current losses. (Well, if you can get very thin laminations, it may be usable.)
- For this frequency range, it used to be ferrite.
- However, nowadays, there are also other materials like metal power, very thin (20um) nanocrystalline
magnetic iron. (Have a look at Vacuumschmelze website).
- You have also metal powder components. (eg Sendust).
- In general, you need to look up the datasheets of the materials of interest. It also depends on your
application. Is it cost driven, or do you have another drive ?. If its cost driven, I guess ferrite is the best, if you have another drive, you may well end with one of the more exotic materials.
P. Arvind With high permeability, flux density is high and hence more iron losses not low at same frequency. Also CRGO minimum thickness is 0.27 mm and hence not suitable. The only option from thickness point of view is Amorphous but cutting problems.
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