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Research in modern helicopters is targeted into the increase of their efficiency due to economical and ecological pressures. This paper introduces two innovative methods of absorbing a ratio of the energy remains of the main engine exhaust gases and converting it to electrical energy. The recovered power is then injected to the electrical bus of the helicopter through power electronics converters. The first one uses thermoelectric generators whereas the second one an electromechanical generator. Both of these systems are analyzed, candidate power converter configurations and topologies are depicted and the results of simulations using SABER are evaluated.Index terms-More electric aircraft, thermoelectric generator, supercapacitor, dc/dc step-up converters, ac/dc rectifiers, pfc converters I.

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Mechanical load simulators are useful in various cases, where we wish to test an electromechanical system. A mechanical load simulator can be used to emulate a wide variety of loads, such as industrial loads, electric vehicle drivetrain, etc. In this paper, a load simulator build for the testing of various electromotion systems, with the capability of four quadrant operation (positive or negative torque, positive or negative rotational speed) and very good transient behavior is presented. The four quadrant operation allows bidirectional power flow, thus enables the study of energy recovery braking. The overall system will be investigated, the control method will be analyzed and finally, simulation and experimental results will be presented.