Medical systems tend to package motors inside tight envelopes (handpieces, gantries, small actuators). High torque density gives you options.

• Higher continuous torque without growing the outer diameter
• Lower current for the same torque (less heat in the system)
• Low inertia options for precise starts/stops and fast reversals
• Windings matched to your bus voltage and speed limit
• Frameless format integrates directly into your housing to reduce stack-up

Explore Frameless Torque Motors

Our frameless motors are engineered with a high Km constant and optimized windings to minimize I²R (copper) losses to maintain 85 °C winding temperature envelope. The motor delivers high continuous torque while preventing excessive heat transfer to sensitive components such as encoders, sensors, and gearboxes. Lower motor temperatures reduce or even eliminate the need for external heatsinks, decreasing actuator mass and enabling more compact designs. The result: reliable, predictable performance under demanding duty cycles — exactly what humanoid robots require for reliable motion and long service life.

In medical devices, continuous torque is often limited by temperature rise near sensors, plastics, adhesives, and patient-contact surfaces. We design for efficient torque production and real conduction into the mechanical structure so temperatures are predictable across the duty cycle. That makes it easier to set safe limits, pass verification, and avoid late-stage redesigns.

If you have constraints like low cogging, low torque ripple, specific speed bands, or tight commutation requirements, we can tune winding and geometry to match. We also support mechanical and electrical interface customization (stack length, lead exits, connectors) so the motor integrates cleanly into your actuator.

Lin Engineering combines U.S.-based manufacturing with the resources of a global, vertically integrated partner. This ensures a stable supply chain, consistent quality, and compliance with the most demanding industry standards. 

From 10 prototype motors to 10 million units in full production, our manufacturing systems are built to scale with your program. In medical devices, laboratory automation, aerospace, and next-generation robotics, we deliver the same commitment: on-time supply, predictable quality, and long-term reliability. 

Learn More About Our Capabilities

Medical programs demand consistency. We support repeatable builds, traceability, and controlled changes so a qualified design stays qualified as volume grows. That includes clear communication on any process or component changes and support for long program lifetimes.

See Manufacturing Capabilities

Early prototypes rarely get everything right. Local engineering and rapid prototyping help you iterate on torque constants, speed ranges, and mechanical interfaces quickly—before you lock the design for verification and validation.

For more than 30 years, Lin Engineering has supplied motors at the core of robotic systems worldwide. Our experience spans collaborative robots, laboratory automation, service robotics, and humanoid platforms — applications where safety, compliance, and smooth interaction with humans are critical.

Our designs address the challenges that matter most in robotics: minimal torque ripple for smooth motion, thermal stability for continuous duty, and long-life durability under repetitive cycles. Engineers rely on our motors because they deliver consistent performance in real-world conditions, not just on the spec sheet.

Medical motion systems often run continuously and cannot tolerate drift. We design for smooth commutation, stable performance over temperature, and durability under repetitive cycles to support reliable behavior over long operating hours.