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EMC Modeling of AC Drive Chris Valenta

EMC Modeling of AC Drive Chris Valenta. Rose-Hulman Institute of Technology & Missouri University of Science & Technology Departments of Electrical and Computer Engineering. MS&T Matt Halligan Igor Izyumin Clint Patton Jason Phillips Dr. Jim Drewniak. RHIT Daniel Baker Gareth Shields

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EMC Modeling of AC Drive Chris Valenta

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  1. EMC Modeling of AC DriveChris Valenta Rose-Hulman Institute of Technology & Missouri University of Science & Technology Departments of Electrical and Computer Engineering MS&T Matt Halligan Igor Izyumin Clint Patton Jason Phillips Dr. Jim Drewniak RHIT Daniel Baker Gareth Shields Chris Valenta Dr. Ed Wheeler

  2. The Problem Electromagnetic Interference (EMI) in AC motor drive Fast switching currents in insulated gate bi-polar transistor (IGBT) module PCB coupling paths to the cables and motor Causes device failure Meet government limits Costly to diagnose late in design cycle COUPLING PATH Cables IGBT

  3. Objectives Create a circuit model (SPICE) of the EMI coupling paths in the drive including: the IGBT package (L and C) the cables and motor measurements and modeling Shielded & unshielded cable Ferrites Document and demonstrate the processes involved for EMC design Demonstrate mitigation opportunities for EMC design and discovery

  4. IGBT Modeling • Intended current paths • Shown in schematic • Non-intended current paths • Parasitic values determined by device geometry • Capacitance • Inductance

  5. IGBT Capacitance Modeling • Area fill to heat sink • Parallel plate capacitor model • Area fill to area fill • <10% of smallest area fill to heat sink capacitance • Constructed regions in CST Microwave Studio

  6. IGBT Measurement C = 39.4 pF

  7. IGBT Capacitance Modeling • Measurements consistent with simulations • Error caused by additional parasitics to other regions

  8. IGBT Inductance Modeling • Phase leg loop total inductance values desired • Simulation results to be placed in equivalent circuit

  9. IGBT Inductance Measurement L=13.3nH

  10. IGBT Inductance Simulation

  11. IGBT Inductance Simulation and Verification Simulated 13.1nH Measured 13.3nH

  12. Lprobe CafA,LafA Lb2 CafG LafG Lb1 CafI,LafI IGBT Partial Inductance

  13. IGBT Partial Inductance

  14. Motor and Cable Measurements • Built test setup for measurements • Impedance Analyzer • Network Analyzer • Time Domain Reflectometer (TDR) • Determine transmission line model of cable • Create high frequency model of motor • Characterize effectiveness of ferrites

  15. Cable Measurements

  16. Motor Model • Initially modeled motor as capacitor • Poor data fit • Used high frequency model from Schinkel et. al. • Took common and differential mode measurements

  17. Motor Model

  18. Ferrites - Measurements

  19. References Mohan, Undeland, and Robbins, Power Electronics: Converters, Applications and Design, New York: Wiley, 1989. Pak, T.T., “EMI Investigation of a Hybrid Electric Vehicle Traction Drive.” Masters Thesis, University of Missouri-Rolla, 2000. Schinkel, M., Guttowski, S., and John, W., “Efficient HF Modeling and Model Parameterization of Induction Machines for Time and Frequency Domain Simulations,” Applied Power Electronics Conference and Exposition, 2006. APEC ‘06. Twenty-First Annual IEEE, pp. 6, Mar. 2006.

  20. Questions? Christopher Valenta – christopher.r.valenta@rose-hulman.edu Daniel Baker – daniel.baker@rose-hulman.edu Gareth Shields – gareth.shields@rose-hulman.edu Dr. Ed Wheeler –wheeler@rose-hulman.edu

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