FMK Hollow Frameless Torque Motor Large for Humanoid Robots-85mm (2900rpm rated speed)

A decade ago, Kinco pioneered frameless torque motor technology for robotics. Today, the FMK series represents our fourth-generation innovation, featuring an optimized stator welding process, improved stator roundness, and a minimized axial length—all while delivering superior performance to meet diverse customer requirements.
Reliable, high-performance operation is guaranteed by the following features:
1. Full-size coverage (50-85 mm stator outer diameter, customizable)
2. Large hollow-bore and high split-ratio design
3. Lightweight and high torque density
4. Low temperature rise
5. Low noise & vibration

Check Specs &files

More details:
Comprehensive -size coverage
With stator outer diameters ranging from 50 to 85 mm, the FMK series suits all joint types—waist, shoulder, elbow, and wrist. It offers the most complete specification range in the industry.
Process upgrade
Improved stator welding and potting processes reduce motor weight and lower temperature rise, effectively addressing heat dissipation challenges in legged robots during prolonged operation.
Structural innovation
The high split ratio and large hollow bore provide greater flexibility for bearing layout, giving mechanical engineers more design freedom. A specialized design reduces the total module length by up to 40%.

• Applications:
  FMK frameless motors are widely used in:
  Collaborative robots & dual-arm robots (J1–J6 joints)
  Rotary joints of quadruped robots (for walking and running motion)
  Flexible joints of humanoid robots