Title :
Eddy currents in medium power switched reluctance machines
Author :
Inderka, Robert B. ; Carstensen, Christian E. ; De Doncker, Rik W.
Author_Institution :
Inst. for Power Electron. & Electr. Drives, Aachen Univ. of Technol., Germany
Abstract :
Switched reluctance machines are characterized by high local flux densities in the core, high current gradients in the windings and relatively large winding areas for the nondistributed windings. In particular, in medium-, high-power and high-speed machines these characteristics may lead to thermal problems. Hot spots in the windings are a result of losses, which originated from high-frequency alternating magnetic fields. It is identified that proximity effects situated at the pole tips and across the entire winding area are causing significant current displacements and in consequence for a considerable amount of copper losses. This paper reports the phenomenon of eddy currents in the windings of switched reluctance machines. Experimental verification and finite-element-simulation are presented for a 4-phase 55 kW switched reluctance machine.
Keywords :
eddy current losses; eddy currents; finite element analysis; losses; machine windings; magnetic flux; reluctance motor drives; temperature measurement; 4-phase switched reluctance machine; 55 kW; SRM drives; copper losses; core; current displacements; finite-element-simulation; high current gradients; high local flux densities; high-power high-speed machines; medium-power high-speed machines; nondistributed windings; switched reluctance machines; thermal problems; winding hot spots; windings; Conducting materials; Costs; Eddy currents; Frequency; Induction machines; Machine windings; Magnetic cores; Magnetic fields; Magnetic materials; Reluctance machines;
Conference_Titel :
Power Electronics Specialists Conference, 2002. pesc 02. 2002 IEEE 33rd Annual
Print_ISBN :
0-7803-7262-X
DOI :
10.1109/PSEC.2002.1022582
