Automotive News awarded BorgWarner with a prestigious 2018 PACE Award for its groundbreaking S-wind wire forming technology for electric motors and alternators. The game-changing manufacturing process enables high-volume production of high-voltage electric motors up to 350 volts. Already in production on a 12-volt alternator for Hyundai Motor Company, BorgWarner expects to launch the technology in a first-of-its-kind 300-volt S-wind motor for an on-axis P2 hybrid vehicle from a major global automaker in late 2019. The compact, high power density technology is particularly well-suited for P2 hybrids, which BorgWarner expects will become a dominant hybrid architecture.
“On behalf of everyone at BorgWarner, we are incredibly honored to receive our tenth PACE Award. Thank you to Automotive News and the judging panel for recognising the hard work, creativity and innovation of our engineers,” said Dr. Stefan Demmerle, President and General Manager, BorgWarner PowerDrive Systems. Sponsored by Automotive News, the annual PACE Awards honor superior innovation, technological advancement and business performance among automotive suppliers. Known around the world as the industry symbol of innovation, PACE stands for Premier Automotive Suppliers’ Contribution to Excellence.
First developed in 2010, BorgWarner has produced its patented and proven S-wind stator for alternator applications. The new proprietary, low-impact manufacturing process enables the high power density and space-saving advantages of S-wind technology for high voltage hybrid and electric vehicles because there is less stress to the wire insulation. This manufacturing process innovation enables BorgWarner to produce smaller, more powerful high voltage electric motors on a mass scale, and will help drive growth in the hybrid and electric vehicle market, resulting in more environmentally-friendly vehicles on the road.
S-wind stators feature continuous copper wire segments formed into a zig-zag S-shape which are then inserted into the stator assembly. Traditionally, wire conductors for S-wind stators are formed using a pneumatic anvil punching process. However, the striking action may stress the wire insulation, and the inconsistent final shape causes additional stress on the wire during assembly into the stator. While acceptable for 12-volt applications, a process resulting in less stress to the insulation system is desired for high-voltage applications in order to maximise motor durability and reliability. To create an S-wind stator for high-voltage motors, BorgWarner’s engineers developed a proprietary low-impact forming process to create a nearly perfect zig-zag S-shape that minimises stress on the wire insulation and eliminates additional stress during assembly.
The proprietary manufacturing process achieves significantly faster cycle times, reduces scrap and requires less floor space. This competitive advantage allows BorgWarner to produce a high-volume, cost-effective solution for automakers.
BorgWarner’s compact and power-dense solution is well-suited for P2 hybrid electric vehicles, where installation space is very limited. BorgWarner’s S-wind stator is nearly 30 percent shorter and delivers more than 50 percent higher torque density than a concentrated-wound stator, establishing a new standard in P2 hybrid electric vehicle applications. Lower mass and a more efficient manufacturing process reduce complexity and cost, while rectangular wire improves slot fill density and heat transfer. Distributed winding offers better cooling and reduces torque ripple—the periodic increase and decrease in torque output as the motor shaft rotates—for smoother rotation and less noise, vibration and harshness (NVH), a key property during pure electric propulsion.
Since the wire-forming process can accommodate wires of various sizes, the S-wind stator configuration is applicable across many 48-volt to 350-volt motor applications. In BorgWarner’s portfolio, the technology will have a positive impact on a variety of products including alternators, integrated belt alternator starters (iBAS), electric all-wheel drive (eAWD) technology, P2 modules, electric drive motors and ePropulsion systems, depending on the