Tula Technology has announced an update to its Dynamic Motor Drive (DMD) software, which enhances electric vehicle (EV) efficiency during low-load conditions. The company, known for its advancements in propulsion efficiency, shared new findings from testing its DMD technology on electric vehicles.
Last year, at the SIA Powertrain 2024 International Congress held in Lille, France, Tula demonstrated its DMD software in a retrofitted EV equipped with an externally excited synchronous motor. Attendees were given the opportunity to test drive the vehicle, showcasing Tula’s ability to reduce energy consumption while improving overall system efficiency.
According to Tula, the Dynamic Motor Drive technology eliminates the need for rare earth elements, resulting in both cost savings and enhanced efficiency. When the vehicle’s torque demands are minimal, the DMD software optimizes the motor’s magnetic field, pulsing it for maximum efficiency.
In collaboration with drivetrain specialist BorgWarner, Tula implemented and tested the DMD system on a luxury SUV that also featured an engine for range extension. This SUV was fitted with internal permanent magnet motors on both its front and rear axles. The application of DMD to the rear axle alone resulted in a 0.6% increase in vehicle range, as measured by the China Light-Duty Vehicle Test Cycle. Tula estimates that applying the DMD technology to both axles could yield a 1.5% increase in range. With 90% of current EVs utilizing permanent magnet motors reliant on rare earth elements, these efficiency gains can significantly reduce battery size and costs or alternatively enhance vehicle range.
Tula describes DMD as a software-only solution that boosts the efficiency of electric drives under low load conditions by pulsing torque near peak efficiency. The company initially focused on battery-electric vehicles but has since attracted interest from manufacturers of plug-in hybrids. Tula’s CEO mentioned that several major automakers are currently collaborating with the company to integrate Direct Motor Drive technology into their platforms.
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