Title :
Prevention of harmful EDM currents in inverter-fed AC machines by use of electrostatic shields in the stator winding overhang
Author :
Magdun, Oliver ; Gemeinder, Yves ; Binder, Andreas
Author_Institution :
Inst. for Electr. Energy Conversion, Darmstadt Univ. of Technol., Darmstadt, Germany
Abstract :
In this paper, an inexpensive mitigation technique is used for prevention of harmful EDM currents in small power inverter-fed AC machines. An electrostatic shield is mounted close to the stator winding overhang to eliminate the capacitive coupling between the stator end winding and the rotor surface. The bearing voltage that is caused by the common mode voltage at the motor terminals via the machine capacitances is reduced and the harmful EDM currents are eliminated. A 3D finite element method (FEM) is proposed for the calculation of the machine capacitances. The results are verified by analytical calculation, 2D FEM calculation and measurements.
Keywords :
AC machines; electrical discharge machining; electrostatics; finite element analysis; machine theory; machine windings; 2D FEM calculation; 3D finite element method; EDM currents; FEM; capacitive coupling; common mode voltage; electric discharge machining currents; electrostatic shields; inexpensive mitigation technique; machine capacitances; power inverter-fed AC machines; rotor surface; stator end winding; stator winding overhang; Capacitance; Capacitance measurement; Finite element methods; Induction motors; Rotors; Stator windings;
Conference_Titel :
IECON 2010 - 36th Annual Conference on IEEE Industrial Electronics Society
Conference_Location :
Glendale, AZ
Print_ISBN :
978-1-4244-5225-5
Electronic_ISBN :
1553-572X
DOI :
10.1109/IECON.2010.5675498
