Title :
Demagnetization characteristics of permanent magnet synchronous machines
Author :
Gilsu Choi ; Jahns, T.M.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Wisconsin-Madison, Madison, WI, USA
Abstract :
This paper presents the calculated demagnetization characteristics of different types of permanent magnet synchronous machines (PMSMs) under the influence of demagnetizing MMF contributed by the stator currents (i.e., armature reaction). The demagnetization of NdFeB magnets is quantified in terms of demagnetized magnet volume and loss of magnet remanence using finite element (FE) analysis. The impact of cross-coupled q-axis current and the rotor position are also investigated. The results comparing seven PM machine configurations show that burying the magnets inside the rotor using interior PM (IPM) rotor configurations generally improves the demagnetization performance. In addition, the machine configurations with distributed windings generally provides better demagnetization-withstand capabilities than the configurations with fractional-slot concentrated windings.
Keywords :
demagnetisation; finite element analysis; permanent magnet machines; synchronous machines; FE analysis; IPM rotor; PMSM; cross-coupled q-axis current; demagnetization characteristics; demagnetization-withstand capabilities; demagnetized magnet volume; demagnetizing MMF; distributed windings; finite element analysis; fractional-slot concentrated windings; magnet remanence loss; permanent magnet synchronous machines; rotor position; stator currents; Demagnetization; Magnetic domains; Magnetic flux; Power capacitors; Rotors; Saturation magnetization; Windings; Demagnetization; NdFeB magnets; concentrated; distributed; interior; permanent magnet; surface; synchronous; windings;
Conference_Titel :
Industrial Electronics Society, IECON 2014 - 40th Annual Conference of the IEEE
DOI :
10.1109/IECON.2014.7048542
