How Robotics Shaped the Way Roamate Came to Be
Roamate was never designed as a traditional wheelchair, nor as an incremental improvement on one. Instead of starting with a chair, we began with movement, balance, and efficiency—the same principles used to design exoskeletons and robotic systems. This approach is what makes Roamate fundamentally different: sleek rather than medical, compact rather than bulky. As the design matured, we incorporated more classic wheelchair features to enhance comfort and the rider’s experience. But Roamate didn’t converge from the same starting point—it arrived here from a completely different direction.
And that difference isn’t just visual. Designing Roamate through a robotic lens also changed the technology we chose to power it. In robotics, movement must feel direct and responsive, applying that same logic to a mobility device meant looking beyond traditional wheelchair motors and gearboxes. The result was its adoption of Quasi-Direct Drive, a motor system originally developed for robotics that brings the same clarity and control to everyday mobility.
What is QDD (Quasi-Direct Drive)?
Most electric wheelchairs rely on big gearboxes to do the heavy lifting. A relatively small motor spins very fast, and a large set of gears slows it down to create torque. It works—but it comes with trade-offs: extra weight, more noise, and a “heavy” feeling in how the chair moves.
Quasi-Direct Drive, or QDD, flips that logic. Instead of forcing a weak motor to work through a massive gear train, QDD starts with a strong, high-torque motor and adds only a small amount of gearing. The gear ratio is so low that the system feels almost like a direct connection between the motor and the wheels.
Because there are fewer gears involved, the movement feels more immediate and natural. When you push the joystick, the chair responds quickly. When you slow down or stop, it does so smoothly, without the lag or mechanical stiffness caused by large gear reductions. And when the motor is off, the wheels don’t fight back—you can push the chair with far less resistance.
In short, QDD is about removing unnecessary complexity. By simplifying the drivetrain and letting a powerful motor do most of the work, it creates a drive system that feels lighter, quieter, and more intuitive—while still delivering the strength needed for real-world mobility.
What does that mean for your experience?
First, it means real power without extra weight. We didn’t need oversized motors or bulky gear trains to achieve the torque required for daily mobility. The result is a chair that’s light enough to lift into a car, yet strong enough to confidently carry a 240-pound user up inclines.
QDD also brings long-term reliability. With fewer gear stages and no worm gears, there are simply fewer components that can wear out over time. The brushless motors run efficiently, and the light gearing puts less strain on the system. That means smoother operation, less maintenance, and a drive system built to handle daily use and frequent travel.
Finally, QDD gives Roamate its smooth, cooperative feel. As a 3-in-1 device—power wheelchair, rollator, and transport chair—responsiveness matters in every mode. The high backdrivability and precise torque control of QDD let the wheels work with you, not against you. This is what made features like AI speed control and assisted push mode possible.
In short, QDD is what allowed us to combine lightweight design with serious performance and smart control—exactly what Roamate was meant to be.
A Smarter Heritage from Robotics
Quasi-Direct Drive was first developed for legged robots that needed to move fast, react instantly, and survive intense physical stress. If you’ve ever seen videos of robotic “cheetahs” sprinting, jumping, or even flipping through the air, you’ve seen QDD at work. Those robots relied on powerful brushless motors paired with very light gearing to achieve something rare: explosive strength combined with quick reflexes.
In robotics, QDD allows a machine to land from a jump without damaging its drivetrain. In Roamate, that same flexibility helps the chair handle real-world obstacles—like door thresholds, uneven pavement, or sudden stops—without jolting the rider or stressing the mechanism. Instead of fighting the terrain, the system adapts to it.
Responsiveness is another gift from robotics. Legged robots constantly make tiny adjustments to stay balanced, and QDD enables that kind of instant feedback. Roamate uses this responsiveness to feel natural and cooperative. When you encounter a change in terrain, the motors react almost immediately, creating a smoother, more “human” driving experience.
Intelligent Speed Control
Beyond its motor design, Roamate is equipped with an intelligent control system that monitors motion in real time. Unlike traditional mobility devices that simply respond to manual input, Roamate actively interprets movement conditions and adjusts in milliseconds.
In walker mode, when an incline is detected, Roamate provides intelligent assist to offset the device’s weight, reducing the effort required to push uphill. When moving downhill, it introduces calculated resistance to prevent overspeed and minimize the risk of losing balance.
This same intelligence also powers smart emergency stopping and fall-prevention protection. If abnormal acceleration or instability is detected, the system can intervene instantly, stabilizing the device to protect the user.
It doesn’t just move when commanded—it collaborates with you to maintain stability, safety, and control.
Why Our 2×170W Motors Can Perform 800W at Peak
Peak power is the maximum punch the motor and controller can give you in intense moments, whereas rated power is the steady-state capability. Pushing out peak power draws more current and heats up the motor, so it can’t do that forever, but it’s incredibly useful for short needs like getting over a hurdle. Consider how an electric scooter or e-bike might be listed as “500 W motor, 1000 W peak.” The 500 W is what it can sustain, and 1000 W is what it can briefly hit during a sprint or hill climb.
Our engineering ensures that Roamate’s control system only calls on that peak output when appropriate – you get the power when you need it (and you’ll feel it), but the system then smartly settles back to efficient cruising power to avoid overheating. This strategy is why Roamate can have small, efficient motors that sip power most of the time, yet it behaves like a much beefier machine in those critical moments. The result: you enjoy longer battery life and cooler motors during normal travel, and you still have up to ~800 W on tap for surges, akin to having a turbo boost for hills or tough terrain.
Real-world mobility isn’t constant. It’s stop-and-go, flat ground followed by sudden challenges. By engineering Roamate for strong peak output, we made sure it behaves like a much more powerful machine in those critical moments—without carrying the weight or inefficiency of oversized motors.