TOP-EMC BDL车载电机上的应用.pdf

BDL Attenuators, LLC DC Motor EMI Suppression DC Motor EMI Suppression 1. Why Do DC Motors Need EMI Suppression? System integration Understanding EMI Noise Sources in DC Motors Compliance with specs. 2. Designing DC Motors for EMI Motor Housing Design End Cap Design Connector Design 3. Applying EMI Suppression to DC Motors Filtering Elements Building EMI suppression Filters 4. Filtering Examples Radiated Emissions Conducted Emissions Transients 5. Summary/Questions 2 System Integration Integrating increased number of electronic devices and electrical systems in a single automobile fuels Electromagnetic Compatibility (EMC) issues such as: Reliability Anomalies Functionality Safety Cost Guaranteed EMC requires the suppression of or immunity from electromagnetic noise sources within a system (automobile). This presentation examines DC motor suppression for EMC 3 Understanding EMI Noise Sources in DC Motors Electrical Current Loop (antenna) Power leads Brushes Commutator Wire coil around armature stack Brush/Commutator Contact Bounce (arc) Power leads Brushes + Housing Commutator _