INVERTER-FED MOTOR DRIVE WITH EMI SUPPRESSION

摘要

Provided is cost-effective suppressing of conducted noise-radio emissions from industrial inverter-motor drives. The invention includes small size L,C filtering elements built inside the inverter, e.g., two grounding capacitances (C1, C2) connected from both sides of the DC link (16) to ground, a line capacitance (C3) across the DC link (16), three line capacitances (C5) across phase leads in the AC input side (20) of a diode rectifier, a zero sequence inductance both in each phase input (IL1) and in each phase output lead (L2) of the inverter. Optionally, an extra secondary winding of the zero sequence inductor is connected to the main circuit of the inverter via an L,R,C network.