The German engineering powerhouse ZF has revealed a breakthrough in electric vehicle (EV) drivetrain technology that could significantly reduce one of the biggest hurdles in EV adoption: winter range loss. With its newly developed Select modular powertrain, ZF claims electric vehicles could achieve up to 30% more range in extreme cold conditions.
Tackling EVs’ Achilles Heel: Cold Weather Efficiency
Cold weather is a well-documented nemesis for EVs. When temperatures drop, so does efficiency—sometimes alarmingly. Range losses of up to 30% are not uncommon, leaving drivers frustrated and anxious during the winter months. These losses stem largely from battery inefficiencies and the increased energy demand of cabin heating systems in frigid temperatures.
Manufacturers and research institutions have long been searching for a remedy. Now, ZF, globally recognized for its sophisticated transmission systems, may have brought the industry closer to a solution.
Inside the Select Modular Powertrain
ZF’s new Select drive unit is a modular, fully integrated system combining an electric motor, inverter, converter, gearbox, and intelligent software. The components are not only designed to work seamlessly together but are also interchangeable, allowing automakers to tailor the setup for specific vehicle platforms and performance needs.
But the real headline is ZF’s magnetless motor technology. Known as the I²SM (In-Rotor Inductive-Excited Synchronous Machine), this motor eschews rare-earth permanent magnets in favor of a more sustainable, space-efficient design. The result? A unit that’s lighter by up to 5 kilograms and capable of squeezing into tighter spaces—ideal for compact EV architectures.
Despite shedding weight and magnets, performance hasn’t been sacrificed. The I²SM motor produces up to 300 kW (408 hp) and a staggering 5,500 Nm of torque, all while reducing energy losses by more than 25% at steady highway speeds—a critical factor in long-distance winter driving.
Smarter Thermal Management with “TherMas”
Perhaps equally important as the new motor is ZF’s enhanced thermal management solution. Dubbed TherMas, the system integrates a compact cooling loop and a propane-based heat pump, delivering superior heating efficiency in subzero temperatures.
According to ZF, at -7°C, the Select system extends EV range by 15% compared to current systems. Push that to -25°C, and the gain rises to a remarkable 30%. For drivers in northern climates or alpine regions, this could be the difference between a confident winter commute and a compromised one.
A Step Toward Broader EV Adoption
ZF’s innovation arrives at a pivotal time. As governments tighten emissions regulations and automakers race toward electrification, solving the issue of cold-weather range anxiety is critical. By rethinking both motor design and thermal efficiency, the Select powertrain addresses this challenge head-on.
With scalability, modularity, and sustainability built into its core, ZF’s Select system could become a key enabler for the next generation of electric mobility—especially in the markets that need it most during winter’s worst.
Source: ZF Friedrichshafen
