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The use of active magnetic bearings (AMB) is increasing in high-speed applications, because their low friction operation allows higher rotational speeds than the traditional bearings. The inherent instability and complexity of the AMB rotor system with high nonlinearities pose challenges to the controller design. This leads to a problem of robust design.(More)
In the time of current trend of increasing energy consumption, the wind-power engineering may compensate considerable part of required electric energy. Rapid wind power engineering development is considered to be one of the important sources of human need satisfaction. Conventional wind turbine control strategies are dedicated to ensure high energy(More)
This paper proposes and investigates the application of the gradient heat flux sensor (GHFS) for measuring the local heat flux in power electronics. Thanks to its thinness, the sensor can be placed between the semiconductor module and the heat sink. The GHFS has high sensitivity and yields direct measurements without an interruption to the normal power(More)
Wind power production in Finland is increasing in near future. Most of the existing and planned wind farms are located in the costal and fell areas where the highest wind speeds occur. The purpose of the present paper is to investigate the inland wind conditions and wind power potential in South-Karelia, southeast Finland, based on wind speed measurements(More)
This paper focuses on the design of a linear robust controller for a mechatronic system in the presence of real parametric and non-parametric frequency-dependent uncertainties. An H<sub>infin</sub> loop-shaping control design procedure is compared with a signal-based H<sub>infin</sub> control. The comparison of the robust controllers is carried out in the(More)
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