Common Mode Voltage Analysis by Considering Semiconductor Device Parasitic Capacitance Effect in an Inverter‐Fed Pole‐Phase Modulated Induction Motor Drive

ABSTRACT Common mode voltage (CMV) influences the operation and life of inverter‐fed drives. This can be attributed to the fact that the high pulsating CMV will dictate the nature of ground currents/common mode currents (CMC) that flow through the drive. The nature of CMV depends on multiple factors like switching patterns, adopted pulse width modulation (PWM), and inverter topology. Additionally, for DC‐decoupled inverter topologies and for inverters with non‐complementary switching actions of top and bottom switches, the CMV depends on the semiconductor device parasitic capacitances (SDPC). Thus, analysis of CMV is critical before designing a drive system. Additionally, the analysis is more critical in an inverter‐fed pole phase modulated (PPM) induction motor drive (IMD). Therefore, the paper proposes switching function–based CMV analysis by considering the inverter's SDPC effect employed for PPM‐IMD. Further, the paper also gives an analysis of the system's CMC. To prove the proposed analysis, a DC‐decoupled inverter‐fed PPM‐IMD is considered to pre‐verify the CMV nature in different pole‐phase combinations (3‐φ, 12‐pole, 9‐φ, 4‐pole). The analysis helps in the pre‐fixation of the PWM and switching patterns of the inverter for smooth PPM‐IMD operation. The realization of the proposed analysis is carried out in the ANSYS environment and illuminated experimentally.