Overview

The Bosch Rexroth MHD041B-144-PP0-UN belongs to the MHD family of synchronous AC servo motors, which are globally recognized for their performance, robustness, and reliability in demanding industrial applications. This particular configuration combines a medium-length housing, a shaft with keyway, and a digital servo feedback encoder, optimized for applications requiring medium torque output, precision, and maintenance-free operation.

The type code gives us a clear picture of this motor’s characteristics:

• 041 → Compact frame size (82 mm flange, 50 mm centering diameter).

• B → Medium-length housing, allowing higher torque than “A” versions.

• 144 → Winding configuration for balanced speed and torque.

• PP0 → Shaft with keyway and encoder feedback, without holding brake.

• UN → Universal rotatable connectors and natural convection cooling.

With order number R911279873, the MHD041B-144-PP0-UN is a precisely defined motor variant that ensures compatibility with Rexroth’s ecosystem and simplifies logistics for spare part management and OEM procurement.

Key Features

1. Medium-Length Housing for Enhanced Torque

   • Delivers continuous torque of ~2.7 Nm at standstill under natural cooling.

   • Ideal for medium-duty axes where compactness must coexist with higher torque output.

2. PP0 Shaft and Encoder Configuration

   • Shaft with keyway ensures secure power transmission to gears, pulleys, or couplings.

   • Digital encoder provides precise servo feedback, enabling closed-loop control.

   • No holding brake, simplifying design for applications that do not require shaft locking at rest.

3. Robust and Reliable Design

   • IP65 enclosure protects against dust and water spray.

   • Bearings are grease-lubricated for life, ensuring maintenance-free operation.

   • Brushless synchronous design guarantees long operating life.

4. Energy Efficiency and Safety

   • Integrated thermal sensors protect against overload.

   • Insulation class F ensures thermal endurance.

   • Compact housing with efficient cooling provides consistent performance.

5. Ease of Integration

   • Standardized flange (DIN 42948) ensures mechanical compatibility.

   • Rotatable connectors make cabling flexible in tight machine designs.

   • Plug-and-play commissioning with Rexroth drives thanks to encoder memory.

Technical Data (MHD041B-144-PP0-UN)

Applications

The MHD041B-144-PP0-UN is particularly suited for:

• Machine Tools: Feed drives, auxiliary axes, and positioning units.

• Packaging Systems: Labeling, sealing, and handling stations with repetitive duty cycles.

• Robotics: Articulated robots, pick-and-place arms, and indexing tables.

• Printing and Textile Machinery: Synchronization of rollers, cutters, and spindles.

• Material Handling: Conveyor drives and automated sorting solutions.

Design and Construction

The motor is built on Rexroth’s proven synchronous servo technology:

• Rotor: Permanent magnets ensure compactness and high torque.

• Stator: Precision windings minimize electrical loss.

• Encoder: Digital servo feedback (PP0) for position accuracy.

• Housing: Robust aluminum design for durability and natural cooling.

• Bearings: Lifetime-lubricated, eliminating regular maintenance.

Advantages for End Users

• Compact High Performance: Delivers torque density suitable for space-limited installations.

• Low Maintenance: Brushless, sealed, and reliable.

• Precision: Encoder-based control for demanding motion tasks.

• Safety: Overload monitoring and IP65 protection.

• Flexibility: Universal connectors simplify cabling.

Ordering Information

• Product Name: Rexroth Synchronous Servo Motor MHD041B-144-PP0-UN

• Order Number: R911279873

• Series: Bosch Rexroth MHD Servo Motors

Conclusion

The Bosch Rexroth MHD041B-144-PP0-UN (R911279873) is a versatile synchronous servo motor offering a powerful combination of torque density, compact size, and precision. With its PP0 configuration—shaft with keyway, encoder, and no holding brake—it is a cost-effective and efficient choice for applications where precise closed-loop control is required without additional holding functionality.

This motor excels in machine tools, robotics, packaging, and materials handling systems, delivering reliability, accuracy, and long service life. It represents a strong investment for OEMs, system integrators, and end users who value Rexroth’s engineering excellence and global support network.