High torque, high payload, precise positioning
DDA torque motors are gearless direct drives for rotary indexing tables. Since there is no mechanical transmission between the motor and the load, there is no gear backlash, no friction losses, and no wear parts.
The direct coupling provides high rigidity in the drive train, fast response, and smooth torque delivery. This allows workpieces on the rotary table to be precisely positioned and controlled even with high moments of inertia.
Two sizes are available:
- DDA-LT18C (flat profile): up to 25.2 Nm, payload up to 90 kg, moment of inertia up to 0.60 kg·m²
- DDA-LH18C (high profile): up to 75 Nm, payload up to 270 kg, moment of inertia up to 1.8 kg·m²
At a glance:
- Compact design with high load capacity (axis width 180 mm, height 70 or 123 mm)
- High repeatability and dynamic performance
- Large through-hole (52 mm), e.g., for routing cables
- Encoder resolution: 17 or 20 bits (selectable)
- Ready for installation: all modules are factory-configured
- Versions: Standard, Cleanroom (ISO 2.5), and IP66M
VIDEO | Filling liquids in vial bottles
Torque motors are rotary direct drives that generate high torque at low speeds directly at the load. There are no gearboxes, belts, or other transmission mechanisms between the motor and the output shaft.
The rotor is directly coupled to the moving load, and its position is controlled via an integrated encoder. For DDA motors, the resolution is either 17 or 20 bits.
Compared to conventional motors with gearboxes, torque motors offer several advantages:
- High precision: Since no mechanical gear ratios are required, the torque curve is very smooth and precise, which is important in applications with exact positioning requirements.
- Efficiency: Since there are no energy losses due to mechanical friction in a gearbox, direct-drive motors can achieve higher efficiency.
- Low maintenance: Fewer moving parts mean less wear and tear and reduced maintenance requirements.
- Compact design: Since no gearboxes are required, the motor can be designed to be more compact, which is advantageous when installation space is limited.
- Fast response: Due to the direct drive, the motor can respond very quickly to changes in the input control signal.
The primary area of application is rotary indexing tables. In these applications, workpieces or workpiece carriers must be cyclically indexed by defined angles, stopped precisely, and held in place. The high holding torque and rigid mounting ensure that the position remains stable even under process forces.
Typical applications:
- Assembly and placement, such as connector assembly.
- Pick-and-place and assembly processes in which a rotary table cycles parts through multiple processing stations.
- Filling systems, such as those for small glass bottles.
- Cleanroom applications with models compliant with ISO 2.5.
- Environments with water or cleaning agents, using the IP66M-rated model.
