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This paper investigates the influence of switching frequency and modulation index on the iron losses in thin silicon-iron (SiFe) lamination sheets of a small slot-less permanent magnet synchronous machine (PMSM). First, measurements are conducted on one welded and one non-welded stator core for switching frequencies between 1 kHz and 20 kHz and modulation indices of 0.4, 0.7, and 0.9, keeping constant...
High performance electrical machines can operate at temperatures of 100C and beyond in rotor and stator cores. However, magnetic properties are generally measured at room temperatures around 23C to 25 C according to the standards, even if it is known that the magnetization of some materials is substantially influenced by increasing temperatures. This paper investigates the...
In this paper, the influence of the welding process during the manufacturing of small, slot-less permanent magnet synchronous machines (PMSMs) is studied. The focus lies on the change of the magnetic properties and the iron losses in thin, high quality Si-alloyed electrical steel sheets (NO 20). It is shown that the welding process changes the magnetic material properties significantly and increases...
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