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Direct Drive Rotary Motor-DDRI-375-150

Motor Size ；375(D)*150(H)mm Cont Torque ；250N.m Peak Torque ；670N.m Cont/Peak CUR ；5/15A-rms

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DDRI Series (Internal Rotor Motor)

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DDRI-375-150 Direct Drive Rotary Motor
Extreme Torque · Ultra-Precision · Zero Backlash Motion Platform
Ⅰ. Product Overview
The DDRI-375-150 from W-Robot represents the pinnacle of high-torque direct drive rotary technology. Designed for large-scale automation systems, this 375 mm outer diameter direct drive rotary motor provides exceptional torque density, high dynamic stiffness, and unmatched rotational accuracy—making it ideal for applications that demand both strength and precision.
By eliminating traditional mechanical transmission components such as gears, couplings, and belts, the DDRI-375-150 achieves pure electromagnetic drive with zero backlash and no mechanical wear. Its large hollow shaft structure allows flexible integration for cable, air tube, or fiber routing through the motor center, optimizing machine compactness and assembly efficiency.
Engineered for long-term reliability and smooth operation, this model offers superior torque output for robotic rotary axes, semiconductor wafer handling, CNC indexing systems, and heavy-duty precision turntables.
Ⅱ. Technical Features
Massive Output Torque: Supports ultra-high torque for large load or high-inertia rotary systems.
Zero Backlash Design: Direct electromagnetic drive eliminates mechanical transmission error.
Large Hollow Shaft (≈ 150 mm): Enables clean routing of cables, optics, or pneumatic lines.
Low Cogging Torque: Advanced electromagnetic optimization ensures smooth, precise rotation at any speed.
High-Resolution Encoder: Integrated encoder system provides micron-level angular positioning.
High Dynamic Response: Suitable for fast acceleration and deceleration cycles.
Quiet Operation: Smooth torque ripple ensures minimal vibration and noise.
Maintenance-Free: No lubrication or mechanical wear—long service life and stable performance.
Ⅲ. Application Fields
The DDRI-375-150 is designed for high-precision, heavy-load rotary systems across a wide range of industries:
Semiconductor manufacturing and wafer handling platforms
Heavy-duty rotary tables and CNC machining centers
Robotic base or large joint modules
Precision inspection, laser cutting, and alignment systems
Aerospace assembly and instrumentation platforms
Large optical instruments requiring ultra-smooth rotation
With its combination of powerful torque, precision feedback, and clean integration, DDRI-375-150 is the perfect motion foundation for next-generation intelligent manufacturing.
Ⅳ. Model Selection & Customization
W-Robot offers multiple customization options for the DDRI series to meet unique automation requirements:
Torque & Speed Adjustments — tuned for specific load and acceleration profiles
Encoder Options — incremental, absolute, or high-bit digital encoders
Cooling Methods — natural, forced-air, or liquid cooling systems
Custom Hollow Shaft Sizes and mechanical interfaces
Servo Drive Integration with W-Robot motion control solutions
Comprehensive CAD models (2D/3D) and detailed datasheets available upon request
Ⅴ. Product Advantages
Gearless, direct-drive structure for zero transmission error
High torque and rigidity, enabling precise and stable motion under load
Compact design with large through-hole for easy integration
Smooth and silent rotation, perfect for sensitive environments
High responsiveness for advanced automation control systems
Long service life, reduced maintenance cost, and improved reliability
Ⅵ. Installation & Maintenance
Ensure flat and rigid mounting to avoid vibration and torque loss.
Use specified torque for all bolts and couplings.
Confirm encoder alignment and calibration before operation.
Keep the motor away from magnetic interference, moisture, and excessive heat.
Perform accuracy checks every 6–12 months for precision retention.
When using liquid or forced-air cooling, maintain clean airflow or coolant circulation.
Ⅶ. Learn More
Explore more with W-Robot:
Product catalog and CAD downloads at www.w-robot.com
Technical article: “Direct Drive Rotary Motors: Redefining Precision Motion”
Contact W-Robot’s engineers for motor selection, integration guidance, or multi-axis system design.
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Listed below are answers to our most commonly asked questions. Don't see your question?Contact our customer service team. We would be glad to assist you.

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Listed below are answers to our most commonly asked questions. Don't see your question?Contact our customer service team. We would be glad to assist you.

What are the future development trends of linear modules and linear motors?

In the future, linear modules and linear motors will develop towards higher precision, higher speed, smaller size, intelligence, and integration with other advanced technologies (such as artificial intelligence and the Internet of Things).

What parameters need to be provided for customized linear motors?

It is necessary to provide detailed parameters such as load weight, stroke, speed, acceleration, accuracy requirements, installation method, and operating environment so that the manufacturer can design and manufacture a linear motor that meets the requirements.

How long is the customization cycle of linear modules?

The customization cycle depends on the complexity of the customization and the manufacturer's production capacity, generally about 1-4 weeks. The specific time can be determined by communicating with the manufacturer.

Can linear motors be upgraded?

The performance of linear motors can be improved by upgrading them with high-performance drives, optimizing control system parameters, and improving heat dissipation structures.

Is it easy to upgrade the linear module?

It is relatively easy to upgrade the motor, control system, guide rail and other components of the linear module according to actual needs to improve its performance and accuracy.

What is the after-sales maintenance service of linear motors?

Regular manufacturers usually provide comprehensive after-sales maintenance services, including fault diagnosis, maintenance guidance, parts replacement, etc., but the response speed and quality of after-sales maintenance services may vary from manufacturer to manufacturer.

What is the warranty period for linear modules?

The warranty period of linear modules from different manufacturers varies, generally around 1-2 years. The specific warranty period can be confirmed with the manufacturer at the time of purchase.

What should we pay attention to when integrating linear motors with other equipment?

Attention should be paid to issues such as interface compatibility, signal matching, control logic coordination, and installation space and layout between devices to ensure that the devices can work together.

Can the linear module be integrated with other equipment?

Absolutely. Linear modules can be integrated with other devices such as robots, sensors, and vision systems to build more complex and intelligent automated production lines.

What kind of control system do linear motors require?

Linear motors typically require a high-performance motion control system that can achieve precise position control, speed control, and thrust control, such as a dedicated linear motor drive with a motion control card or a high-end PLC.

Products

Direct Drive Rotary Motor-DDRI-375-150

Ⅰ. Product Overview

Ⅱ. Technical Features

Ⅲ. Application Fields

Ⅳ. Model Selection & Customization

Ⅴ. Product Advantages

Ⅵ. Installation & Maintenance

Ⅶ. Learn More

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