Inverter EMI modeling and simulation methodologies

A numerical prediction of electromagnetic interference (EMI) allows evaluation of EMI performances A the design stage and before prototyping. It can also help reduce the post-prototype EMC cost by minimizing late re-design and modifications of a drive implementation. This paper describes two simulation approaches with time- and frequency domain simulations and verifies them with experimental results. Both time- and frequency-do main simulation approaches are found effective as long as the noise source and propagation path are properly modeled. The 3-dimensional. finite element analysis (FEA) based parasitic parameter extraction tool - Ansoft Spicelink(TM) has been used substantially. To gain additional degree of confidence, the results obtained from FEA are verified with closed-form solutions and actual measurements.