Concentrated winding machines fed by PWM inverters: Insulation design helped by simulations based on equivalent circuits

摘要

In more electric aircrafts, the fast-fronted pulses imposed by PWM inverters to the motor windings may cause an earlier aging of the thin polymer layers of the electrical insulation system (EIS). In low-pressure environments, the voltage distribution in all the components of the EIS is major issue for designing long-life electrical machines. The voltage stresses in the thin insulating layers of the compact machines must remain under control for avoiding partial discharges (PD). The paper proposes an approach based on High Frequency (HF) equivalent circuits for analyzing the resonances in a motor winding. The paper focuses on the windings of permanent magnet synchronous machines built with one coil per stator slot.