Technical Paper
Reduction of Computational Efforts to Obtain Parasitic Capacitances Using FEM in Three-phase Permanent Magnet Motors
2024-04-09
2024-01-2742
With the rise in demand for electric and hybrid vehicles, the issue of bearing currents in electric motors has become increasingly relevant. These currents are mainly caused by inverters used in machines that generates high frequency common mode voltage and current, the main responsible for bearing currents. Those high frequency generates parasitic capacitances due to the gaps in the motor, these parasitic capacitances offer to the current generates one way of low impedance and these currents run to the bearing of the motor. Investigating this problem in practical scenarios during the design stage is costly and requires great technical skill to measure these currents and especially the electric discharge arc that occurs in the bearing. For this reason, a strategy of analysis aided by electromagnetic simulation software can achieve desired results in terms of complexity and performance.