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Stator insulation guidelines for allowable dv/dt and peak over-voltage such as NEMA MG-1, Part 31 and GAMBICA are well established. To meet these guidelines inverter output reactors are often used to reduce motor dv/dt and peak over-voltages for inverters with short output cables. However, an output reactor solution using ultra-long motor cables actually substantially increases motor peak over-voltage...
PWM AC drives generate high differential mode motor voltages due to the reflected wave phenomenon. The common-mode voltage produced by a PWM inverter also has fast transitions that result in high peak currents to ground. For low power AC drives this can present several issues, such as pump-up of the DC bus and failure of the power module due to high instantaneous currents that are often undetected...
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