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Technical Overview of the RollerDrive
Zero-backlash Technology — Created to provide the ultimate in functionality and performance.
Zero-backlash Technology Delivers Unsurpassed "Motion"
In FA equipment, servo-driven motion control systems play a major role in defining the performance of the equipment. Machine specifications and performance requirements are developed assuming the given system can produce the expected motion. However, if the motion control system has backlash, lacks rigidity, or has other control instabilities, the output motion will deviate from the control input and make it difficult to achieve the expected performance.

The RollerDrive® RA Series mechanically reduces the speed of the servomotor while delivering powerful torque, rigidity, and stability. It features a unique preload mechanism that achieves zero backlash so that the output motion responds faithfully to input control references. Various features make this a revolutionary motion control unit for FA applications. Take for instance the high efficiency afforded by the rolling transfer of power, wearless design, compact packaging resulting from the right-angle input to output shaft layout, and the convenient, large-diameter hollow output shaft.
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Striving for True Quality Motions
Input control reference and output motions: Comparison between a RollerDrive® and common equipment
With conventional motion equipment, the quality of motion was primarily assessed by its accuracy and rigidity in a static condition. In reality, accuracy and stability impacts the performance of FA equipment in motion just as much as it does in standstill conditions.
Backlash or poor responsiveness can degrade the dynamic accuracy of motion control equipment, preventing it from creating the motions intended by the control references.

The RollerDrive® uses zero-backlash technology to create output motions that are faithful to the input control references, which delivers improved performance levels in all kinds of FA equipment.
Boosts Performance of Various FA Equipment
High-speed Positioning
High-speed Positioning
Settling time is instantaneous for precise positioning. Speed variation during motion is minimal for accurate synchronized operation. Virtually maintenance free for reduced life cycle cost of the entire FA system.
High-accuracy θ Axis Positioner
High-accuracy θ Axis Positioner
The output shaft of the RollerDrive® has very minimal runout, which makes it suitable for precision θ-axis positioners and alignment tables. Its thin, compact design makes it ideal for X-Y stages and other positioning units as well.
Swing and Oscillating Arm Drive
Swing and Oscillating Arm Drive
Improved speed and reciprocating repeatability allows thin-profile drive layouts for compact integration. Piping and cables can easily be passed through the hollow bore in the large diameter output shaft.
Preload
Preload
Wedge-shape ribs on input shaft maintain contact with the roller followers under preload to completely remove backlash. Preload is adjusted by turning the adjustment mechanism on the input shaft.
Input Shaft
Input Shaft
The steel alloy input shaft is made to meet extremely tight tolerances using the latest in machining theory and equipment. These shafts are balanced to suppress self-excited vibration under high speed rotation.
Roller Followers
Roller Followers
Roller bearing construction transfers torque by the rolling action of the roller followers. Rolling contact maintains the initial accuracy, even for extended periods of use.
Oversized Hollow Output Shaft
Oversized Hollow Output Shaft
The output shaft has an oversized hollow bore that allows easy passage of wiring and piping, or the shaft of another device, for extended design flexibility.
Cross Rollers
Cross Rollers
Cross roller bearings are used inside the output unit for increased rigidity and minimal runout.
Motor Shaft Clamp
Motor Shaft Clamp
The motor shaft is rigidly clamped to the input shaft of the reducer for a direct transfer of power from the motor. The motor base is designed to absorb error in alignment during assembly. (Patent pending)
RollerDrive® Performance Overview
*1 Some combinations may not be practical for certain operating conditions. *2 Circles at each intersection denote overall accuracy. The larger the more accurate. *3 "All-in-one" refers to packages that include a servomotor and amplifier. *4 Ratios from 1/100 to 1/200 require optional attachment. *5 Maximum output refers to maximum torque at starts and stops. *6 The hollow shaft is fixed. On the RM series, the RM200 features a fixed center shaft. *7 Weights are listed with the servomotor mounted.
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