Currently used airborne power systems that require 28Vdc and 115Vac power utilize one of the following approaches: - Two generators, one with a DC output and the other with AC output - A single DC generator with AC a Static Inverter or an AC generator with a TRU Both techniques listed above have weight, size and efficiency impacts to the system. It is, therefore, beneficial to identify a solution that would utilize a single generator with dual output which would require minimum power conversion and conditioning. Such system would offer high efficiency at a low weight, as well as significant cost advantages. IPS is proposing an innovative generator design which will include a second AC winding on its stator in order to provide the AC output. IPS engineers have experimented with this type of generators, and found the idea viable. Dual output, which will yield in essence a 17 kVA generator, will have a small impact on the diameter when compared to an equivalent DC generator with only 400 A output and a small weight penalty, keeping the output a high efficiency. The GCU will have to include a small VSCF converter in order to provide the required AC output.
Benefit: The technology developed as a result of the proposed effort will allow for the removal of gearbox accessories. The dual output from a single source generator will supply power to several areas of the aircraft, such as main electrical power, windshield heating, deicing, etc. Potential applications for this technology include any aircraft that needs free up gearbox pads or requires increased power. The technology allows for both AC and DC outputs. IPS is already using similar technologies on the Learjet 85 (LJ85) business jet. The LJ85 program will enter qualification testing this year and will be the first IPS dual output generator to enter the market. Although the technologies proposed in the SBIR are somewhat different than the Learjet 85 application the aircraft market for this type of technology is limitless.
Keywords: AC/DC Electric Power, AC/DC Electric Power, Dual Output, Electromgnetic, Power Density, UH-1-Y/Z, Rectifiers, Aircraft
