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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Analysis of an asynchronous machine with electronically switchable pole count.
 Němec, Josef ; Cipín, Radoslav (referee) ; Bárta, Jan (advisor)
This Masters thesis deals with pole-changing machines. Advantages and possible design of these machines was presented in the first chapter. The use of pole-changing machines in electric traction was discussed in the second chapter, together with the possibility of fluent pole change. The last chapter deals with construction of these machines and their inventors. In the fourth chapter an equivalent circuit model of the machine was presented and later used to calculate basic machine parameters for the use in finite element method. In the fifth chapter a machine with toroidal winding was designed, which allows various coil connections and thus it allows the winding to have different pole and phase count. Several possible connections and combinations of phase and pole numbers were presented and exemined with the help of finite element method. Based on this analysis, an asynchronous motor with distributed winding was designed in the last chapter and its ability to increase efficiency at higher speeds by changing the number of poles was verified.
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Analysis of multiphase electrical machine performance
 Kříž, Antonín ; Mach, Martin (referee) ; Bárta, Jan (advisor)
In this thesis, a research on the history and current applications in transport of multiphase motors was conducted. Subsequently, a research on the aspects related to multiphase induction machines was carried out. Finally, the electromagnetic model of six phase induction machine was investigated in the in healthy condition and one faulty phase. The changes of parameters and motion of the motor were compared for both conditions.
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