Modeling of Conducted Emission for a Three-Phase Motor Control Inverter
Ali Safayet, Mohammad Islam
Abstract
This article presents modeling of the conducted emission of a motor control inverter using a lumped parameter circuit and finite-element (FE)-based three-dimensional (3-D) electromagnetic simulation. The objective of the modeling is to validate the circuit design and component selection as well as predict the conducted emission at the early design stage of the motor drive system. This model is useful to save time and cost of design iteration for any power electronic converter used in industrial applications. In this study, the main sources of conducted emissions of a power inverter along with a layout of complex geometry are identified. Then, analytical study along with circuit and FE-based electromagnetic simulation is used to implement the model of the motor inverter pair. The simulation model considers the board and component parasitic responsible for the common-mode current generation due to pulsewidth modulation switching. The effect of motor housing, harnesses, and chassis structure on common-mode noise generation is presented by the 3-D simulation model that cannot be realized in circuit simulation. The simulation model is validated with the experimental results that showed good correlation.