Nexteer Automotive has introduced a new steering component called the High Mount Direct Drive Steer-by-Wire Hand-Wheel Actuator, or HMDD, designed to give automakers more freedom in how they design vehicle cockpits and steering systems for software-defined vehicles. A steer-by-wire system replaces the traditional mechanical linkage between the steering wheel and the wheels with an electronic connection, translating the driver's steering input into digital commands sent to the road wheels, while still providing feedback so the steering feels natural. The new HMDD combines a motor positioned higher up in the steering column, direct-drive responsiveness, and a stationary hub that doesn't rotate with the wheel, together offering more design flexibility, a premium steering feel, and the ability to scale across different vehicle platforms.
The idea behind HMDD reflects a broader shift happening in the auto industry: as vehicles become more software-defined, electrified, and architecturally flexible, steering systems have an opportunity to move away from fixed mechanical layouts toward more adaptable, software-driven motion control.
HMDD is the newest addition to Nexteer's lineup of direct-drive hand-wheel actuators for steer-by-wire systems. Alongside the company's existing low-mount option, which sits under the dashboard, HMDD gives automakers another choice, letting them select whichever actuator architecture best fits their vehicle's packaging needs, cockpit design goals, and desired driving experience.
By combining its compact high-mount design, direct-drive responsiveness, and stationary hub, HMDD opens up several new possibilities for cockpit design. It allows for more flexible steering interface designs, including center-hub controls and display concepts, steering wheels that can be stowed or reconfigured, and more options for where the steering wheel itself is positioned. The stationary hub also enables a different approach to airbag integration, since it removes the need for the symmetrically shaped driver airbags typically required for steering wheels that physically rotate. The system can also reduce overall mass by up to 23%, compared to legacy steering columns, depending on the specific vehicle and its packaging requirements. And it's designed to scale across internal combustion, hybrid, and electric vehicle platforms, supporting both 12V and 48V electrical systems as well as left- and right-hand-drive configurations.
HMDD adds to Nexteer's broader steer-by-wire portfolio, which itself is part of the company's wider Motion-by-Wire chassis control strategy, covering steering, braking, rear-wheel steering, and other software-enabled motion control systems. Combined, these technologies are meant to enable coordinated motion control that can improve safety, performance, and efficiency beyond what traditional mechanical systems alone can achieve.
Michael Hales, executive director of research and development at Nexteer, said HMDD gives automakers a new way to rethink both the cockpit and the overall driving experience, while also improving steering feel, packaging flexibility, and safety-critical performance. He said that as vehicles become more software-defined, technologies like HMDD help create a more flexible foundation for differentiated steering experiences and future vehicle designs.
For drivers, HMDD is designed to deliver a premium steering feel through smooth, direct torque response and adjustable driving modes that provide realistic feedback from the road and a stronger sense of connection to the vehicle. Because it's direct-drive and can be tuned through software, its behavior can potentially be updated over time, including through over-the-air software updates, as automakers' broader software strategies continue to develop.
For automakers, HMDD offers a way to standardize and scale steer-by-wire hardware across different vehicle lines, while still allowing brands to differentiate themselves through software-defined steering feel, cockpit experience, and other user-facing features. Nexteer says this approach can help reduce part complexity, support faster development timelines, and create a more flexible foundation for future software-enabled vehicles.
HMDD was recently named a finalist for the 2026 Automotive News PACE Pilot Award, which recognizes pre-commercial innovations with strong potential for real-world market impact.
