Development of Lightweight Transformers for Airborne High Power Supplies.

Abstract : Several major developments have occurred in this program. As is often the case in research, they did not occur exactly in accordance with the original plan. The total program however is essentially on schedule. New techniques for fabrication of pie wound transformers were developed which yielded superior designs. This development was followed by the development of computer aided design programs for pie wound transformers. Several 10KW transformers have been fabricated and subjected to a variety of tests. Based on the results of these tests both the 10KW and 200 KW transformers will be pie rather than layer wound. A 10KW transformer rectifier system is presently being integrated with a breadboard inverter for final verification. During the first half of this program, a numerical method was developed for the solution of the nonlinear lumped parameter transformer model. This model was developed under the previous contract, but no stable solution had been found. The present solution is for a resistive load and work is continuing to include leakage inductance, shunt capacitance, and an arbitrary load impedance. The present program has been implemented on the HP 9830 machine. As mentioned above, pie wound transformer design programs have been written. These are for interactive design on the HP 9830 and are not self optimizing routines. A decision should be made as to the ultimate application of these programs before a decision whether or not to implement them on the CDC 6600.