The widespread adoption of fast-switching wide-bandgap (WBG) semiconductor devices, such as silicon carbide (SiC) transistors, in motor-drive systems has led to a substantial increase in overvoltage stress imposed on motor windings due to shorter rise time of WBG devices. This yields accelerating insulation degradation and reducing reliability of motor stator windings. This digest presents a comprehensive comparative analysis of the new smart coil mitigation solution versus the well-established conventional RLC dv/dt filter solution. The analysis considers performance metrics such as efficiency, size, and installation convenience. Traditional RLC dv/dt filters, although proven effective in attenuating voltage slew rates and protecting winding insulation, often introduce significant losses, increase the system’s size, weight, and cost. In contrast, the smart coil approach employs an ultra-efficient, ultra-compact, adaptive, and self-powered circuit. This comparative study aims to provide insights about the unique characteristics of the new smart coil solution for broad motor-drive applications.
