Rexroth Synchronous Servo Motor MHD041B-144-NP0-UN (Order Number R911280346)

Overview

The Bosch Rexroth MHD041B-144-NP0-UN is a synchronous AC servo motor from the renowned MHD series, built for precision, performance, and reliability in industrial automation. With its medium-length housing, encoder integration, and shaft with keyway, this model is tailored for applications requiring high torque density, robust construction, and precise closed-loop motion control.

Its type code reveals key characteristics:

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

• B → Medium-length housing for increased torque capacity compared to “A” size.

• 144 → Winding configuration optimized for speed-torque balance.

• NP0 → Shaft with keyway and digital encoder, but without holding brake.

• UN → Universal rotatable connectors and natural convection cooling.

With the dedicated order number R911280346, this variant can be precisely identified and sourced for OEM applications or spare part replacements.

Key Features

1. Medium-Length Housing for Greater Torque

   • Delivers continuous torque of approx. 2.7 Nm at standstill.

   • Increased torque compared to shorter “A” housing models, yet compact enough for versatile installations.

2. NP0 Encoder and Shaft Configuration

   • Shaft with keyway ensures safe mechanical coupling to gears, pulleys, and direct drives.

   • Digital encoder provides accurate servo feedback for precision in motion control.

   • Encoder memory allows quick commissioning with Rexroth drives.

3. Maintenance-Free Design

   • Brushless, permanent-magnet synchronous motor.

   • Bearings lubricated for life reduce downtime and servicing costs.

   • IP65 enclosure ensures reliable operation in harsh conditions.

4. Flexible Integration

   • Universal rotatable connectors simplify wiring in space-constrained machine layouts.

   • DIN-standard flange design supports direct mounting in existing or new systems.

   • No holding brake option (NP0) provides cost-effective operation for applications not requiring axis holding at rest.

5. Safety and Longevity

   • Built-in temperature sensors prevent overheating.

   • Insulation class F supports long-term durability under thermal stress.

   • Optimized winding configuration improves energy efficiency.

Technical Data (MHD041B-144-NP0-UN)

Applications

The MHD041B-144-NP0-UN is designed for medium-duty applications requiring precise motion control and robust durability:

• Machine Tools: Auxiliary axes, tool changers, and spindle drives.

• Robotics: Compact manipulators, indexing systems, and assembly units.

• Packaging: Labeling, filling, and sealing processes with frequent start-stop cycles.

• Printing and Paper: Roller drives, feeders, and cutters requiring precise synchronization.

• Textiles: Continuous-duty processes with varying torque demands.

• Material Handling: Conveyors and sortation systems.

Design and Construction

• Rotor: Permanent magnets ensure compact design with high torque density.

• Stator: High-efficiency windings reduce energy loss.

• Encoder (NP0): Digital feedback provides precise control.

• Housing: Aluminum, naturally cooled, lightweight yet durable.

• Bearings: Lifetime-lubricated, maintenance-free.

This design ensures smooth torque output, fast dynamic response, and long operational life.

Advantages for End Users

• Compact and Powerful: High torque density in a small footprint.

• Maintenance-Free: No brushes, sealed bearings, long life.

• Flexible Integration: Universal connectors and standardized flange.

• Safe and Reliable: Overload protection, IP65 enclosure.

• Efficient: Optimized torque-to-inertia ratio improves productivity.

Ordering Information

• Product Name: Rexroth Synchronous Servo Motor MHD041B-144-NP0-UN

• Order Number: R911280346

• Series: Bosch Rexroth MHD Series

Conclusion

The Rexroth MHD041B-144-NP0-UN (R911280346) is a compact, medium-length synchronous servo motor engineered for precise, reliable, and efficient performance in industrial automation. With its NP0 configuration—shaft with keyway and encoder, but without brake—it offers an optimal balance of torque, accuracy, and cost-efficiency.

This motor is an excellent choice for OEMs, integrators, and end-users in machine tools, packaging, robotics, printing, and handling systems, where precision and durability are key. By choosing this product, buyers gain access to Rexroth’s proven engineering excellence, ensuring long service life and reduced total cost of ownership.