Nexteer HMDD Steer-by-Wire Actuator Enables Flexible Cockpit Design

Nexteer Introduces HMDD Steer-by-Wire Actuator

On August 11, Nexteer Automotive introduced its new High Mount Direct Drive Steer-by-Wire Actuator, known as HMDD, as vehicle architectures increasingly transition toward software-defined platforms. The compact actuator combines a high-mount motor, direct-drive responsiveness and a stationary hub to provide premium steering feel while supporting scalable vehicle integration. The stationary hub also expands cockpit design possibilities by enabling center-hub control and display concepts, stowable steering interfaces and simplified airbag integration. This approach gives original equipment manufacturers greater flexibility when developing future vehicle interiors while retaining the steering response and safety-critical performance expected from advanced steering systems.

HMDD Enables Greater Packaging And Mass Efficiency

The HMDD architecture can reduce mass by up to 23% compared with legacy column-based steering architectures, creating opportunities for more efficient vehicle packaging. Its stationary hub removes the requirement for a symmetrically designed driver airbag, potentially providing additional freedom for cockpit layouts and steering-interface concepts. The actuator is designed to support combustion, hybrid and electric vehicle platforms, as well as both 12V and 48V electrical systems. Compatibility with left- and right-hand-drive configurations further increases its scalability for global vehicle programs, allowing Nexteer Automotive to address different platform architectures through a compact steer-by-wire solution.

HMDD Supports Future Cockpit And Chassis Architectures

According to Michael Hales, Executive Director, Research and Development at Nexteer Automotive, HMDD gives OEMs a new way to rethink the cockpit and driver experience while enhancing steering feel, packaging flexibility and safety-critical performance. The technology forms part of Nexteer’s broader Motion-by-Wire chassis strategy, which spans steering, braking and rear-wheel steering. By combining these functions within a broader by-wire architecture, the company is positioning HMDD for vehicle platforms where software-defined functionality, flexible packaging and integrated chassis control become increasingly important considerations in future vehicle development.

Frequently Asked Questions

What is Nexteer’s HMDD steer-by-wire actuator?
HMDD is a High Mount Direct Drive Steer-by-Wire Actuator developed by Nexteer for future vehicle architectures requiring greater cockpit and packaging flexibility. The compact system combines a high-mount motor, direct-drive steering response and a stationary hub, enabling concepts such as center-hub controls, displays and stowable steering interfaces. Its architecture can reduce mass by up to 23% compared with legacy column-based designs and supports combustion, hybrid and electric platforms using 12V or 48V systems. It also accommodates both left- and right-hand-drive configurations for broader vehicle-program integration.