Papers by Keyword: Electrical Machine

Abstract: In this paper, the non-conservative system of a rotating electrical machine is analytically investigated by means of an effective analytical approach, namely the Optimal Homotopy Asymptotic Method (OHAM). Besides analytical developments, in order to prove the efficiency and accuracy of the proposed approach, numerical simulations are performed for a specific working regime. Comparison between approximate analytical results obtained by OHAM and numerical integration results obtained by a fourth-order Runge-Kutta method emphasize that OHAM is reliable and easy to use in finding analytical solutions to damped systems.

Abstract: This paper proposes a Hinfinity controller for current harmonics in a wound rotor synchronous machine. By reducing some specific current harmonics, it will be able to decrease the level of the corresponding harmonics in of the magnetic field and so of the vibration level induced by the force on the machine stator created by this field.

Abstract: Up to now most of the efforts for developing HTS technology have been directed to devices for grid applications. However, HTS synchronous machines as motors and generators become more and more interesting within the world-wide development programs. Replacing the copper winding of the rotor by an HTS one and introducing an iron-less aircore stator winding the very compact HTS machine has less than half the weight and volume, higher efficiency and an excellent operational behavior when compared to the conventional devices. These features make HTS rotating machines very attractive for e.g. ship drives and industrial applications for the processing industry and power generation in power plants and wind parks. World-wide, HTS machines have already demonstrated their advantages and technical feasibility. The prototypes are ranging from the 5 MW low-speed high-torque propulsion motor to the high-speed 3600 rpm 4 MVA HTS generator. Feasibility studies clearly show the financial benefits when introducing high-efficient HTS wire based rotors into a large scale power generator systems. At present, most of the industry driven activities take place in the United States, Germany, Japan and Korea and are mainly directed towards applications aboard ships. Further potential applications as well as the technical and economic benefits will be discussed.