KDU Direct Drive Motor with Hollow Shaft
Direct drive motor achieving 10 arc-sec positioning accuracy and plus minus 0.5 arc-sec repeatability with large hollow shaft design
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Product Overview
KDU series direct drive motors achieve 10 arc-sec positioning accuracy and plus minus 0.5 arc-sec repeatability with 0.16 arc-sec resolution. Large hollow shaft allows cables shafts or lasers to pass through the axis of rotation. Available in KDU-13SB with 7 Nm maximum torque and KDU-13WB with 15 Nm maximum torque. Incremental encoder 11840000 pulses per revolution. Combined with HA-770-2 AC servo driver.
The KDU is a fully integrated rotary actuator combining servo motor, harmonic gear reducer, encoders, servo electronics, and compact mechanical packaging in a single assembly.
Direct Drive Motor Architecture
Direct drive hollow shaft motors eliminate intermediate gearing to achieve exceptional positioning accuracy and repeatability. The large hollow through-bore allows cables, shafts, or optical systems to pass through the axis of rotation.
Ultra-High Accuracy
Direct drive eliminates gear transmission error for 10 arc-sec or better positioning accuracy.
Hollow Shaft
Large central through-bore for cable, shaft, or optical beam routing through the motor axis.
High-Resolution Encoder
Multi-million pulse per revolution encoder for sub-arc-second resolution feedback.
Low-Speed Precision
Optimised for precise slow-speed positioning without cogging or gear compliance.
Brushless AC Motor
AC servo motor construction for long-life maintenance-free operation.
System Integration
Pairs with dedicated servo driver for closed-loop position control.
Typical Applications
The KDU suits precision rotary positioning stages, optical equipment, semiconductor lithography, telescope positioning, laser scanning, and any application where direct drive eliminates gear transmission error for maximum accuracy.
Key Specifications
Critical performance parameters at a glance
Technical Specifications
Overview
KDU-13SB
KDU-13WB
Product Attributes
Industrial Applications
These direct-drive motors are used where high-precision rotary motion is needed without conventional gear reduction, helping reduce mechanical complexity and backlash.
Precision Rotary Tables
Drives direct rotary positioning stages where smooth motion, responsiveness, and mechanical simplicity are important.
Robot Auxiliary Axes
Supports high-response rotary axes in robotic and automation systems where eliminating gears improves motion quality.
Inspection & Metrology
Useful in systems requiring highly controlled rotary movement for scanning, inspection, and precision measurement tasks.
Semiconductor & Electronics
Applied in clean, precise motion platforms where compact direct-drive performance benefits process control.
Tracking & Alignment
Used in rotary alignment, antenna, optical, or tracking systems where fine control and low mechanical loss are desirable.
High-End Automation
Supports advanced automation systems that need direct rotary motion with reduced drivetrain complexity.
Factory Modification & Custom Sourcing
This product supports custom configurations and equivalent sourcing
Available Modifications
- •Torque and speed ratio customization
- •Mounting interface modifications
- •Connector and wiring specifications
- •Housing and enclosure options
Sourcing Options
- •Standard product sourcing
- •Equivalent product identification
- •Replacement part sourcing
- •Volume pricing (MOQ may apply)
Request Pricing & Availability
Submit an RFQ for standard products, custom configurations, or equivalent alternatives
Frequently Asked Questions
Technical answers sourced from engineering specifications and integration guides.
The KDU achieves 10 arc-second positioning accuracy after angular position correction and plus or minus 0.5 arc-second repeatability.
Have a technical question not answered above?
Our application engineers review every RFQ and respond with specification-matched recommendations.