Dizertační práce se zabývá modelováním a řízením elektrických pohonů během poruchových stavů. Práce se obzvláště zaměřuje na více-fázové motory. První část práce se zabývá matematickými rovnicemi obecného více-fázového motoru a následným odvozením n-krát troj-fázového zapojení motoru. Modely v dq souřadnicovém systému a modely ve statorových souřadnicích jsou navrženy pro simulaci chování motoru během poruchových stavů. Další část práce se zabývá analýzou poruch ve více-fázových motorech s využitím matematických modelů. Různé vnitřní struktury vinutí motoru jsou analyzovány z pohledu možného řízení během poruchového stavu. Taktéž je prezentováno chování těchto různých struktur motoru během poruchových stavů. Předmětem analýzy jsou elektrické poruchy vinutí motoru a elektrické poruchy výkonové elektroniky. Poslední část práce se zabývá testováním navrženého řídícího algoritmu a navržených kompenzačních strategií pro poruchy na reálných motorech. Pro testování byl použit segregovaný dvakrát troj-fázový motor a experimentální motor s odbočkami pro emulaci poruch vinutí. Provedené testy prokázaly, že vhodně navrhnutý motor v kombinaci se správným řídícím algoritmem a výkonovou elektronikou dokáže zaručit kontinuální běh pohonu i během poruchy.

<p>In the process of designing an electric power supply system for an aircraft, parameters like low weight and low losses are important. Reliability, robustness and low cost are other important factors. In the Saab Gripen aircraft, the design of the primary power supply of the electric flight control system was updated by exchanging a switching transistor regulator to a magnetic amplifier (magamp). By introducing a magamp design, weight was saved and a more reliable power supply system at a lower cost was achieved.</p><p> In this particular case, with the power supply of the electric flight control system in the Saab Gripen fighter, advantage could be taken of a specific permanent magnet generator (PM-generator). The frequency of the generator offered the perfect conditions for a magamp controller. A key parameter in designing magnetic amplifiers (magamps) is low losses. New amorphous alloys offer new possibilities of the technique in designing magnetic amplifiers, because of their extremely low losses.</p><p> The core losses are evaluated by studying the equations and diagrams specifying the power losses. The core losses are evaluated and compared with the copper losses in the process of optimizing low weight and low losses. For this an engineering tool is developed and demonstrated.</p><p> Evaluations of the hysteresis characteristics for the magnetic alloys, as well as modeling and simulation of the core losses, are presented in this work. The modeling of the core losses includes hysteresis losses, eddy current losses and excess losses as well as copper losses. The losses are studied dynamically during realistic operational conditions. The model can be used for any generic analysis of hysteresis in magnetic circuits. Applications of magnetic amplifiers in aircrafts have been demonstrated to be a feasible alternative</p>

In the process of designing an electric power supply system for an aircraft, parameters like low weight and low losses are important. Reliability, robustness and low cost are other important factors. In the Saab Gripen aircraft, the design of the primary power supply of the electric flight control system was updated by exchanging a switching transistor regulator to a magnetic amplifier (magamp). By introducing a magamp design, weight was saved and a more reliable power supply system at a lower cost was achieved. In this particular case, with the power supply of the electric flight control system in the Saab Gripen fighter, advantage could be taken of a specific permanent magnet generator (PM-generator). The frequency of the generator offered the perfect conditions for a magamp controller. A key parameter in designing magnetic amplifiers (magamps) is low losses. New amorphous alloys offer new possibilities of the technique in designing magnetic amplifiers, because of their extremely low losses. The core losses are evaluated by studying the equations and diagrams specifying the power losses. The core losses are evaluated and compared with the copper losses in the process of optimizing low weight and low losses. For this an engineering tool is developed and demonstrated. Evaluations of the hysteresis characteristics for the magnetic alloys, as well as modeling and simulation of the core losses, are presented in this work. The modeling of the core losses includes hysteresis losses, eddy current losses and excess losses as well as copper losses. The losses are studied dynamically during realistic operational conditions. The model can be used for any generic analysis of hysteresis in magnetic circuits. Applications of magnetic amplifiers in aircrafts have been demonstrated to be a feasible alternative / QC 20101103