Advancement of CM, EMI and Motor Bearing Compatibility Solutions in Support of PEPDS and SiC Applications
Abstract
Advancement of CM, EMI and Motor Bearing Compatibility Solutions in Support of PEPDS and SiC ApplicationsVariable frequency drives (VFDs) are employed on U.S. Navy ships for many applications including propulsion, pumps, fans, compressors, etc. Currently, Si-based power semiconductor switching devices are widely used in VFDs using pulse-width modulated (PWM) inverters. The high dv/dt PWM inverter output pulses have adverse effects on the system components and the machines theyare driving due to insulation stresses and damaging motor bearing currents resulting from common mode voltages (CMVs) and shaft voltages. As a result, specifically to address bearing currents in Si-based VFDs, several mitigation techniques have been suggested in the past to prevent bearing damage including filters, reducing the CMV through an additional bridge, improved modulation strategies, insulating the bearings, and using a brush to ground the rotor shaft or capacitive coupling shunting. Advanced CMV modeling and mitigation research is being conducted at the Naval Post Graduate School (NPS) led by Dr. Giovanna Oriti, Common Mode Modeling and Mitigation Techniques in Power Converter Building Blocks for Shipboard Power, which is funded by ONRthrough FY22. Advanced research on inverter duty motor bearings for SiC applications is being conducted at Baylor University by Drs. Annette von Jouanne, Emmanuel Agamloh and Alex Yokochi, (Award# N00014-20-1-2193, Development of Advanced Inverter Duty Motor Bearings for SiC Applications), which is funded by ONR through March 2022.The focus of this proposal is to leverage and expand NPSs and Baylors research through a strategic collaboration and support of the Power Electronic Power Distribution System (PEPDS) development program including the advancement of high-power-density high-efficiency Silicon-Carbide (SiC)applications. The proposed collaborative research includes the optimization and hardware verification of NPS common mode (CM) and electromagnetic interference (EMI) modeling and mitigation research, where the PIs will work to align the project s goals with the PEPDS development plan including to apply the new CM and EMI elimination methods to iPEBB. This proposal will enable the more comprehensive research on CM and EMI modeling and elimination to include the optimization, hardware verification and elimination techniques in inverter applications to meet EMI Standard MIL-STD-461. This will contribute to the future electromagnetic compatibility (EMC) noise solution within iPEBB, and will be coordinated with collaborators to develop models of the iPEBB and to transfer the knowledge and experience gained from studying the MIL-STD-461requirements.The Baylor University bearing current hardware testbeds will be replicated at NPS and the results transferred to industry through the dissemination of publications and through the licensing of the technologies developed to the relevant industries and manufacturers. In addition, this work will inform government agencies through improved design specs/standards for SiC inverter grade bearings up to thousands of hp. This information will also be useful to the NSWC-PD and the Tech Warrant holder at NAVSEA through decreasing maintenance cycles and by making available the bearing advancements and results for SiC proof motor drive systems and robust journal bearings.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 06, 2021
- Source ID
- N000142112084
Entities
People
- Annette von Jouanne
Organizations
- Baylor University
- Office of Naval Research
- United States Navy