EMI filter design in motor drives with Common Mode voltage active compensation

TLDR

Coordinated design of a motor CM‑voltage active compensator and an input EMI filter enables compliance with EMC standards. This paper investigates the design issues of input EMI filters for inverter‑fed motor drives that incorporate motor CM‑voltage active compensation. Two CM input EMI filters were constructed—one following conventional design and the other accounting for impedance mismatching—and both included the active compensator, with their performance experimentally evaluated against standard compliance limits. The coordinated design achieved compliance with EMC standards and improved system reliability.

Abstract

In this paper the design issues of input electromagnetic interference (EMI) filters for inverter-fed motor drives including motor Common Mode (CM) voltage active compensation are studied. A coordinated design of motor CM-voltage active compensator and input EMI filter allows the drive system to comply with EMC standards and to yield an increased reliability at the same time. Two CM input EMI filters are built and compared. They are, designed, respectively, according to the conventional design procedure and considering the actual impedance mismatching between EMI source and receiver. In both design procedures, the presence of the active compensator is taken into account. The experimental evaluation of both filters' performance is given in terms of compliance of the system to standard limits.