“Looking into this datasheet of core material N87 from EPCOS, can you tell what is the Bmax? I can't figure it out.”
100khz is a lucky number. There is one dedicated chart just for that. Otherwise you would have to use the general purpose one.
I put a pic of both charts here with red markers. The charts have lines for 25 deg C and 100 deg C. Generally you run a transformer at 60 to 70Deg C, so i tried to place the red line at that point. It looks to me that is around 1100 to 1200G.
You should get the same gauss from reading either chart. The dedicated 100khz chart is much easer to read so take a few different points there and try to read them off of the general chart for practice.
“Regarding the EI type: In the datasheet of suppliers, for example, ferroxcube, the specification in those datasheet are only for one E half, right?”
Yes.
Now, the use of your method wally, can be applied to the I type? That part that goes on top of the E core? Where the I part enters in the calculations?”
Nothing changes in the calculation. The center leg is the same as it always was, length x width = CM squared. And window area, is window area, length x width = CM squared. Window area is the open area in the core. With a EE core the window area goes across two E cores. With a E and I core the window area is only as deep as one E core.
100khz is a lucky number. There is one dedicated chart just for that. Otherwise you would have to use the general purpose one.
I put a pic of both charts here with red markers. The charts have lines for 25 deg C and 100 deg C. Generally you run a transformer at 60 to 70Deg C, so i tried to place the red line at that point. It looks to me that is around 1100 to 1200G.
You should get the same gauss from reading either chart. The dedicated 100khz chart is much easer to read so take a few different points there and try to read them off of the general chart for practice.
“Regarding the EI type: In the datasheet of suppliers, for example, ferroxcube, the specification in those datasheet are only for one E half, right?”
Yes.
Now, the use of your method wally, can be applied to the I type? That part that goes on top of the E core? Where the I part enters in the calculations?”
Nothing changes in the calculation. The center leg is the same as it always was, length x width = CM squared. And window area, is window area, length x width = CM squared. Window area is the open area in the core. With a EE core the window area goes across two E cores. With a E and I core the window area is only as deep as one E core.