Powder metallurgy allows designers of electric motors to implement new magnetic circuit structures. A relatively new concept is the use of a magnet system consisting of various types of magnets on one rotor, for example sintered and bonded magnets. This concept has been applied to the design and manufacture of the four-pole rotor of a synchronous motor with 400 W power and a rotational speed of 1500 rpm. In this motor, the stator of an asynchronous motor type Sh 71-4B is applied. The application of the new construction of the rotor resulted in an increase in motor efficiency and power factor compared to an asynchronous motor with the same volume.
It is our great pleasure to introduce the special issue of Archives of Electrical Engineering that includes selected papers (first 9 papers in this issue) presented at the Symposium on Electrical Machines (SME) held on June 17th-20th 2012, in Książ, Poland. SME'2012 was the 48th meeting of specialists from Poland, Belarus, Germany and Czech Republic, dealing with various aspects of electrical machines. Its aim was not only to allow for the mutual exchange of experience between researchers for academia and industrial research centers, but also to present new developments in theory, construction, mathematical modeling and simulation testing, control, diagnostics and applications of electrical machines. The special session on permanent magnet electrical machines has been organized. The education issues in electrical machines and drives have been discussed also.The SME symposium was organized by the Institute of Electrical Machines, Drives and Measurements from the Faculty of Electrical Engineering, Wroclaw University of Technology, Poland, under auspices of the Committee on Electrical Engineering of the Polish Academy of Sciences, and in cooperation with the Polish Society of Theoretical and Applied Electrical Engineering -Wroclaw Section. The Chairman of the Organizing Committee was Professor Teresa Orłowska-Kowalska, from the Faculty of Electrical Engineering, director of the Institute.The Symposium was attended by more than 100 participants from all Polish scientific teems engaged in the field of electrical machines and drive systems, and was well recognized among industry specialists.For this issue we have selected nine papers from 105 presented during SME, closely related to the line of Archives of Electrical Engineering (presented in as the first part of this issue). Among the selected papers you will find a spectrum of subjects dealing with various issues discussed during SME, starting from the induction machines, their modeling, control and applications, through permanent magnet synchronous and stepper motors, to piezoelectric motors and magnetic bearings. We hope that this issue of AEE will be interesting and stimulating for the readers.The guest editors would like to thank all authors for their contributions and all reviewers for their excellent work.
Presented article deals with the determination of turbogenerator electromagnetic parameters from the SSFR test (Standstill Frequency Response). A method utilized to prepare the results is finite element method based on the module of Steady State AC Magnetic 2D application. Obtained reactances could be determined after an application of own made program used to fit the curves (magnitude and phase characteristic of operator transmittances) to the data coming from the simulation in order to designate the time constants. The achieved results are compared with the data coming from the running test. Streszczenie. Prezentowany artykuł przedstawia symulacyjną metodę wyznaczania parametrów elektromagnetycznych turbogeneratora z testu SSFR (Standstill Frequency Response). Zastosowana metoda obliczeń bazuje na rozkładzie pól sinusoidalnie zmiennych o zadanej zmiennej częstotliwości. Reaktancje turbogeneratora zostały wyznaczone ze stałych czasowych za pomocą opracowanego programu. Program ten dopasowuje charakterystyki amplitudowe i fazowe do wartości otrzymanych z symulacji. Wyniki obliczeń parametrów elektromagnetycznych porównano z wynikami pomiarów. (Symulacyjne wyznaczanie parametrów elektromagnetycznych turbogeneratora z testu SSFR).
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