SAE 2013 Electric Powertrain Technologies Symposium

Technical Session Schedule

Tuesday, March 12

(Session Code: EM100)

Room Cosmopolitan ABCD  ALL DAY

The SAE Electric Powertrain Technologies Symposium will cover a broad range of topics for this slice of the hybrid and EV market. The OEMs will come and report out on their latest work and their electric motor suppliers will talk about topics such as cost considerations such as the latest in magnet pricing. A separate session will have Tier-2 suppliers discussing how to reduce the amount of rare earth elements in magnets, new electrical steels being utilized, and winding efficiency. A new session to the program on power electronics is meant to broaden the reach of this symposium to include those other components in the powertrain and discuss topics such as integrating power electronics into motors (such as in BAS mild hybrid systems).

Organizers - Timothy George Thoppil, Yizhou Xu, P3 North America Inc.; David A. Fulton, Remy Inc.; Wolfgang Bernhart, Roland Berger Strategy Consultants

Time Paper No. Title
7:55 a.m. ORAL ONLY
Welcome and Overview
Nori Fought, SAE International
8:00 a.m. ORAL ONLY
Keynote Presentation: Electric Powertrains - Where We are Today and the Challenges Ahead
The presentation will begin with an overview of the current technology and market trends in the electric powertrain industry. Building on this foundation, a framework for evaluating the challenges that the industry faces in the next ten years will be presented. In particular, partnership models, sourcing decisions, cost reduction opportunities and strategies to adapt to a fragmented EV market will be addressed from a high level perspective to set the stage for discussions during the day.
Samit Ghosh, P3 North America Inc.
8:30 a.m. ORAL ONLY
OEM Reports: The Chevrolet Spark EV 1ET35 Drive Unit - Performance, Efficiency, and Drive Quality
GM is introducing the 2013 Spark Battery Electric Vehicle. It offers compelling vehicle performance and drive quality in a very efficient package. GM has developed a custom electric traction motor and fixed-gear reduction drive unit to meet the the vehicle's driving character. The motor and drive unit are being produced at GM's White Marsh, Maryland plant. The drive unit motives the Spark to give it a spirited launch feel and extraordinary passing performance, with superior NVH characteristics and excellent efficiency. Specific technical content choices were made for overall efficiency, drive quality, cost, and performance. Elements of motor technology, motor design, gear ratio, gearing architecture, and lubrication system and technical choices made are presented.
Peter Savagian, General Motors
9:00 a.m. ORAL ONLY
OEM Reports: Semiconductor Challenges in Electrified Powertrain
Semiconductors are key enablers in the electrified powertrain. The total semiconductor contents (in $ value) in electrified vehicles more than doubled compared to a standard vehicle and therefore, hybrid-electric vehicle is the key growth areas for semiconductor companies. The four key challenges in the semiconductors are: product portfolio, device performance, reliability and cost. While the progress in the first three areas are significant, system cost reduction still remains a challenge. From a semiconductor company perspective, a cost reduction recipe will be proposed. The role of new technologies, economies of scale, co-operation and ‘happiness’ in system cost reduction will be discussed.
Sayeed Ahmed, Infineon Technologies North America Corp.
9:30 a.m. Panel
Q & A / Discussion with OEM Speakers
Chairpersons - Samit Ghosh, P3 North America Inc.
10:00 a.m.
Networking and Refreshment Break
10:30 a.m. ORAL ONLY
Electric Motors Reports: Hidden Costs in Motor Specifications
It is a challenge to write a good motor specification. Typical spec. problems are omitted or ambiguous requirements, or overly tight tolerances that drive up cost but not value. These problems create hidden penalties in cost, performance, reliability, and development time. This presentation will describe common problems in traction motor specifications and associated penalties, as well as recommendations to avoid them. Topics will include spec.’s for demagnetization, mechanical considerations, torque ripple, performance, and others.
David A. Fulton, Remy Inc.
10:55 a.m. ORAL ONLY
Electric Motors Reports: Examining the Difference in Energy Consumption between A PMAC Motor and an Induction Motor over Various Drive Cycles
Choosing a technology for a traction motor to be used in a hybrid or electric vehicle is not a simple. Two major choices exist: PMAC or Induction technology. The debate continues as to which type yields the best performance, efficiency and cost. These areas impact both the OEM and the user.
Jay Schultz, Parker Hannifin Corp.
11:20 a.m. ORAL ONLY
Electric Motors Reports: Emerging Electrical Motor Systems
As the automotive industry continues to evolve toward more energy efficient systems new technologies are emerging. Many of these new technologies involve the use of permanent magnet motors / generators in order to improve efficiencies. The presentation will include technologies such as Thermal and Kinetic energy recovery systems which are being used in the formula one racing circuit and also electronically actuated turbocharger systems which have been a topic of interest for many automotive manufacturers.
Aaron Williams, Arnold Magnetic Technologies
11:45 a.m. ORAL ONLY
Electric Motors Reports: Selecting and Applying Electric Current and Voltage Transducers for High Accuracy Power Measurements on Electric Power Trains
Safe measurements on high power, variable frequency power systems require current and voltage transducers providing electrical isolation of the measurement system from the high power primary circuit. For power measurement accuracy approaching 1% it is desirable that the transducers should have amplitude accuracy of 0.1%, and phase accuracy of better than 0.1 degree, over the power frequency range that can be dc to over 1kHz. And they must operate reliably in the electrically and magnetically noisy environment of a high power electric motor. Diagnostic tests of power converters having switching waveforms with rise times in the nsec range do not have critical accuracy requirements but the transducer frequency response must extend to 20MHz or higher. This presentation will provide an overview of commercially available transducers and their application.
Ian Walker, GMW Associates
12:05 p.m.
Q & A / Discussion with Electric Motors Speakers
Chairpersons - Samit Ghosh, P3 North America Inc.
12:30 p.m.
Networking Luncheon
1:30 p.m. ORAL ONLY
Tier-2 Supplier Reports: Overview of Advances in Rare Earth Permanent Magnet Materials Technology that Improve Motor and Generator Performance and Reduce Rare Earth Content
The presentation will review new magnet technologies under development which could increase rare earth magnet performance by substantially increasing the maximum energy product compared to current neodymium iron boron and samarium cobalt systems. Such systems utilizing nanocomposite or other technologies would utilize less critical rare earth elements. A new class of rare earth permanent magnets with high electrical resistivity will be presented. These materials are comprised of a rare earth magnetic phase and ceramic phases, which disrupts or reduces the flow of electrons through the bulk magnet material. This technology is being applied to both rare earth permanent magnet types including the samarium cobalt (Sm-Co) and neodymium iron boron systems (Nd-Fe-B). Magnets with higher electrical resistivity will enhance electrical efficiency in higher speed motor and generator applications and help enable lower temperature operation, increase power density, reduce complexity and cost, enable higher pole counts, and even mitigate usage of heavy rare earth elements. This presentation will also review the current status of development of this Department of Energy SBIR Phase III sponsored work and highlight magnetic, mechanical and electrical resistivity performance.
Peter C. Dent, Electron Energy Corp.
1:50 p.m. ORAL ONLY
Tier-2 Suppliers Reports: Improved Non-Oriented Electrical Steels for Energy Efficient Electrical Machines
Commercially supported 0.30 mm and 0.27 mm non-oriented electrical steel grades with excellent properties at both low and high frequencies have been introduced in the last two years. These grades have special application to permanent magnet (PM) design motors. A model is presented to show how cost-performance benefits can be evaluated for different grades.
Gwynne Johnston, Tempel Steel Co.
2:10 p.m. ORAL ONLY
Tier-2 Suppliers Reports: Advances in Stator Manufacturing as relates to Laminations, Magnets, etc.
Materials and processes are continuing to advance in the manufacturer of specialty electric motors and components. Two significant ones, of note by other speakers, are laminations and magnets. As these and many others become more sophisticated, so their interaction becomes increasingly important. Some of the advanced competencies, in process at Windings, are discussed individually, how they relate, and how they improve the final product.
Norm Kopp, Windings Inc.
2:30 p.m.
Q & A / Discussion with Tier-2 Supplier Speakers
Chairpersons - David A. Fulton, Remy Inc.
2:50 p.m.
Networking and Refreshment Break
3:20 p.m. ORAL ONLY
Power Electronics: Limiting the Overshoot on IGBT during Turn-Off Using Stray Inductance
With limited space for the Power Inverter in Electric and Hybrid Vehicle applications and the cost of the semiconductors, the demand for integration of power electronics has increased. The first way of reducing the room taken by the semiconductors is to increase their efficiency.

The losses in IGBT modules are mainly caused by two sources; conduction and switching; and advances in IGBT technology are making improvements in both areas. One of the ways to improve IGBT module switching losses is to accelerate the IGBT turn-ON and turn-OFF transition; with faster IGBT turn-OFF, the overvoltage caused by stray inductance of the module increases so much that we need to slow down the turn-OFF to protect the device, thereby impacting efficiency.

This presentation suggests that we can gain greater efficiency by using the stray inductance of the IGBT module to control the dI/dt during the turn-OFF process without slowing down the dV/dt.
Jean-Marc Cyr, TM4 Inc.

3:40 p.m. ORAL ONLY
Power Electronics: Are HEV and EV Market Changes Affecting Power Electronics?
The acceptance of hybrid and electric vehicles is largely influenced by the cost of the advanced vehicle systems. Inverter electronics can represent up to one fourth of the cost of the electric powertrain systems. The purpose of this presentation is to discuss the types of products that will be required to fill the needs of vehicle customers in light duty to heavy duty applications. Electrified powertrain electronics suppliers will face a widely varied demand for products in lower than normal volumes for the short term.
Thomas Goesch, Remy International Inc.
4:00 p.m. ORAL ONLY
Power Electronics: The use of Simulation in Electric-machine Design
This presentation will provide clarity on differing numerical methods to aid the design and optimisation of electric machines. Firstly classical, lumped magnetic network models will be presented using examples from recent work which provides an almost instantaneous results. This will be contrasted with 2 dimensional finite element computations which is "de rigour" in most industrial setting. Finally the emerging use of full 3 dimensional thermal analysis coupled to the electromagnetics will be highlighted. The effect of the power electronics model on such simulations will be discussed. The various drivers behind the use of these methods will be contrasted and the ever growing need to include increasing levels of physics to reach optimum designs will be reported. The presentation will close by highlighting the challenges for future numerical methods to more and more link into a electric drive trains control system.
Stefan M. Holst, CD-adapco
4:20 p.m. ORAL ONLY
Power Electronics: Inverter Development for the P2 HEV to Meet European OEM Requirements
Most of the European OEMs are developing P2 hybrid transmission as part of their answers to emission and fuel economy regulations. Their requirements for inverter are based on a specification developed by the VDA. This presentation will provide analysis of the VDA specification, discuss suitable inverter and DC/DC converter topologies and then focus on two major challenges - packaging and EMC filtering.
Zilai Zhao, Magna Electronics
4:40 p.m. ORAL ONLY
Power Electronics: Validation of Electric Drive and Battery Management Systems for Powertrain
Many types of hybrid and electric drive (E-Drive) control systems are being developed for platforms in the automotive and commercial vehicle industries. These systems also use Battery Management Systems (BMS) to handle their demanding power needs. However, the development of these technologies brings increased system complexity, evident in the many platform variants and control algorithms of various electronic control units (ECUs). There is also a greater need to handle system-level control strategies, via communication networks and command software. There are several tools and systems available that can make the process for E-Drive or BMS development easier to handle, from proper I/O interfaces to test these systems, to models for simulation of these controlled systems. There is also the need for consideration of power and safety requirements and precision of the simulation or control capability. This presentation will cover the use of HIL systems and models for the development and validation of electric-drive and BMS control systems for powertrain. This engineering process involves specific implementation techniques for model processing and interfaces in real-time along with critical power interface and electrical hardware functionality.
Jace Allen, dSPACE Inc.
5:00 p.m.
Q & A / Discussion with Power Electronics Speakers
Chairpersons - Scott Craig, Infineon Technologies North America Corp.
5:30 p.m. ORAL ONLY
Conclusion and Final Remarks
Scott Craig, Infineon Technologies North America Corp.

Planned by Electric Motors and Electric Powertrains Organizers / EMB Land and Sea Group