The following geometric dimensions are considered in Figure 1: b t = 5 mm, h c = 20 mm, D = 120 mm, D e = 195 mm, δ = 0,5 mm, a m =38 mm, ε = 3 mm. Fig.1 – The transverse section of the PMSG. The magnetization direction of the permanent magnets is shown by the arrows that are placed inside them (Figure 1). The spaces between the magnets (the rotoric slot opening) are filled by special shaped steel parts that create a closing path for the magnetic field. The magnets are placed over a parallelepiped iron stump. Its transverse section is depicted in Figure 1. The generator’s transverse section geometry The studied PMSG has four poles. This assumption influence the concluding remarks that rise from the study especially for the PMSG’s that have a large (length) / (transverse diameter) ratio. The magnetic field is calculated by using the plane parallel hypothesis. The modeling of the generator’s magnetic field spectrum is done by using the finite element method and with the help of specialized software. The paper shows the study of the rotoric permanent magnets’ magnetic flux and the transverse generator’s geometry influence over these fluxes. Initially used only for small and medium powers the PMSG’s are now used also for higher powers (because of their already mentioned advantages). Introduction From all the generators that are used in wind turbines the PMSG’s have the highest advantages because they are stable and secure during normal operation and they do not need an additional DC supply for the excitation circuit (winding) –. Key words Synchronous generator, permanent magnet, simulation, optimization. The studies show that for certain values of these dimensions the magnetic flux (flux linkage and mutual flux) has maximum values. Keeping the same rotor diameter the generator’s magnetic flux is maximized by changing the permanent magnets and rotoric slot opening dimensions.
The paper shows a 2D finite element optimization method for a wind turbine permanent magnet synchronous generator (PMSG) transverse geometry. Ilina 1 1 Department of Electrical Engineering University Politehnica of Bucharest Splaiul Independen ţ ei 313, 060042 Bucharest (Romania) Phone/Fax number: +40 214029289/+40 213181016, e-mail:, ,, Abstract. Wind turbine permanent magnet synchronous generator magnetic field study C.
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