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Thermal Challenges and Solutions in GM's Hybrid and Electrical Advanced Propulsion Systems (KEYNOTE)
Keywords: keynote, thermal, hybrid
The electric drive systems used in the electrical and hybrid vehicles reduce the dependence of US transportation on petroleum and are a strategic component in meeting the CAFÉ standards. The improvements of the power electronics and electric machines, that are essential components of advanced vehicle propulsion system, are necessary to ensure a wider acceptance of the new generation vehicles. Some of the critical goals in the development of electric drive systems are reducing their size and weight, maximizing the performance, and improving their robustness and reliability. All these opposing requirements make the design and fabrication very challenging. The large energy density involved in electric drive systems makes thermal management a critical component of the overall system design. This presentation will discuss some of the critical elements including heat sinks, semiconductor chips size and arrangement, thermal interface materials, cooling and packaging approaches, and the tools available for their improvement. The design and optimization of the system are completed based on experimental results, analytical solutions and conjugated heat transfer analysis. At the GM Advanced Technology center in Torrance, we focus on advancing the technology for innovative low cost, high quality solutions for electrification of automobiles (BEV, HEV, PHEV, EREV and FCV). We have identified multiple approaches to remove heat from the critical components through optimization of the components and subsystems. The same approaches can be also used to increase the system’s performance and reliability.
Vicentiu Grosu, Sr. Project Engineer
General Motors
Torrance, CA

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