A traditional servo rotary actuator consists of a rotor, stator, housing, bearings, end caps, and feedback components. A frameless motor removes all redundant mechanical structures and retains only the electromagnetic conversion core. The rotor becomes a direct part of the load shaft, while the stator is integrated into the machine structure through bonding, locking, or potting.

The backlash-free planetary rotary actuator typically integrates an internal rotor frameless torque motor with precision backlash-free planetary gearboxes, absolute encoders, and other components to form a complete rotary actuator unit. Its control system (drive unit) is usually externally mounted, enabling high-precision motion control for connected equipment. Compared to harmonic drive-based rotary actuators, this series employs high-rigidity backlash-free planetary gearboxes, offering superior stiffness, load capacity, and bending moment resistance. It is designed for applications demanding high rigidity, ultra-precision, and compact integration, such as machine tool rotary tables, precision medical devices, 5-axis laser cutting systems, and semiconductor equipment.

The large hollow bore rotary actuator typically integrates an internal rotor frameless torque motor with components such as a harmonic drive reducer, absolute encoder, and customized large hollow bore harmonic drive unit to form a complete rotary actuator assembly. Its control unit (drive system) is usually externally mounted, enabling high-precision motion control for connected equipment. Compared to standard rotary actuators, this series features a larger hollow bore diameter, allowing passage of lead screws, cables, and other components. It is designed for applications requiring large through-bore space, high precision, and compact integration, such as machine tool rotary tables, precision medical devices, 5-axis laser cutting systems, and semiconductor equipment.