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Frameless Torque Motor

Frameless BLDC Torque Motors (Frameless Brushless DC Torque Motors) are a type of direct-drive motor composed solely of a stator and rotor, with no housing, bearings, or shaft.

Frameless BLDC Torque Motors (Frameless Brushless DC Torque Motors) are a type of direct-drive motor composed solely of a stator and rotor, with no housing, bearings, or shaft. Their core features include low speed and high torque, zero backlash, high dynamic response, and high integration, specifically designed for precision motion control applications.

I. Core Definition and Structure
  • Full name: Frameless Brushless DC Torque Motors (Frameless Brushless DC Torque Motors)

  • Extremely simple structure: only the stator (windings + iron core) + rotor (permanent magnet), no housing, no bearings, no output shaft. Drive type: Brushless DC (BLDC) / Permanent Magnet Synchronous (PMSM), mostly designed with multiple pole pairs to achieve low-speed, high torque.

  • Integration method: The stator is embedded in the equipment base, while the rotor is directly mounted on the load shaft, with the equipment itself serving as the motor's structure and support.
II. Key Performance Features
  • High torque density: delivers high output torque per unit volume/weight, up to 2–3 times that of conventional servo motors.

  • Zero backlash, high precision: gearless / coupling, with repeat positioning accuracy of ±1 arcsecond.

  • Low inertia, fast response: lightweight rotor, small inertia, high dynamic response bandwidth (>1 kHz), suitable for frequent starts, stops, and reversals.

  • Direct drive, high efficiency: eliminates the need for a reduction mechanism, offering higher efficiency, longer lifespan, and maintenance-free operation.

  • Compact and lightweight design: No casing required, enabling deep integration, saving space, and reducing overall weight.
III. Typical Application Scenarios
  • Robot: Collaborative robots, humanoid robots, robotic arm joints (core preferred).

  • Medical equipment: surgical robots, precision medical actuators.

  • Precision Automation: Semiconductor Equipment, Rotary Tables, Indexing Tables, Winding Equipment.

  • Aerospace / Underwater: Drone gimbal, underwater thruster, satellite drive.

  • Others: exoskeletons, VR/force feedback devices, telescopes, radars, etc.