Re: Winding BiTT with C shape winding tool

Body

Hi Kone,

The Heins transformer core can be reduced to a three legged core:


The primary winding is the center leg and the secondaries are the side legs. The three top (and bottom) reluctances can be distributed on just three legs as shown to the right. The top reluctance can be split into two series reluctances in parallel with the other two horizontal reluctances. As they then are parallel to the two horizontal reluctances they can be reduced to just those two reluctances but of less reluctance. Those two remaining horizontal reluctances are now in series with the two side legs and thus can be reduced to just the side leg's reluctance but having the series reluctance of each side leg's reluctance and one of the horizontal reluctances. This becomes the figure to the right. Two reluctances are placed in series at the center leg as one of them can be an air gap. Else this leg has to be longer or have less cross sectional area to have greater reluctance than the rest of the circuit.

The core is now identical to the Jensen UDT trafo core. Thus there is no need for using the complicated core. A standard EI-core with an air gap in the center leg will do the same thing. If no air gap is wanted two U-cores (as secondaries) and an I-core (as primary) of less cross sectional area will do the same thing.

Regards
Ole


 

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