In SiC-based adjustable speed drives, the fast-switching voltage pulses cause the cable to act like transmission line, resulting in severe overvoltage at the motor terminals. One effective solution to tackle this issue is installing passive filters at the inverter side to reduce the dv/dt of the voltage supplied to the adjustable speed drives. However, the conventional dv/dt filter design approaches solely focus on the filter’s design for a specific dv/dt without fully considering the influence of the cable and the parasitic elements of the filter. This oversight can lead to suboptimal designs in terms of the filter’s output performance and its effectiveness in mitigating the overvoltage at the motor terminals. This paper aims to bridge these gaps by exploring the influence of cable along with the parasitic inductance of the damping resistor on the filer’s performance, including the filter output voltage, power loss, and its effectiveness in mitigating motor overvoltage. To verify the optimum design, three RLC dv/dt filters that have similar output voltage waveforms are designed and experimentally assessed.
