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In the paper a comparative analysis is carried out on seven different self-excitation methods that have been developed in the past decades taking into account the technical and economical features of the methods compared. A novel solution based on resonant circuit application is described in more detail, and the theoretical considerations have been confirmed by computer simulations and laboratory...
The paper reports unexpected failures of ultrahigh speed induction machine (USIM) supplied by PWM converter applied in a system developed for utilizing renewable and waste energies. Due to the high supply frequency of USIM the frequency ratio in the PWM converter was unusually low. The imperfect operation of the microcontroller commanding the PWM pattern generated subharmonics. It developed considerable...
The paper is concerned with the study of ultrahigh speed induction machine (USIM) applied in the utilization of renewables and recovering waste energy. The rated speed of the machine is 90 000 rpm. The main target of the study is to investigate the performance of the speed control loop in order to avoid or minimize the overspeed. The USIM is modelled by using an approximate and an accurate model....
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