Rexroth Synchronous Servo Motor MHD041B-144-NP1-UN (Order Number R911281505)

Overview

The Bosch Rexroth MHD041B-144-NP1-UN is part of the MHD servo motor family, a proven line of synchronous motors designed for high-precision and high-dynamic industrial automation. This motor combines medium-length housing, optimized torque output, a robust shaft with keyway, and integrated encoder technology, making it ideal for machine tools, robotics, packaging systems, and automated handling equipment.

Its type designation reveals its configuration:

• 041 → Compact motor frame with 82 mm flange and 50 mm centering diameter.

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

• 144 → Specific winding code tailored for optimized electrical and thermal performance.

• NP1 → Shaft with keyway plus encoder option, enhancing flexibility and feedback accuracy.

• UN → Universal connector orientation and natural convection cooling for simple installation.

The dedicated order number, R911281505, ensures exact identification for procurement, spare parts, and engineering purposes.

Key Features

1. Medium Housing for Higher Torque

   • Continuous torque at standstill: approx. 2.7 Nm in convection cooling.

   • Provides the balance between compact size and torque output for medium-load tasks.

2. NP1 Option: Shaft and Encoder

   • Shaft with keyway for secure mechanical coupling.

   • Encoder system included, ensuring precise position and velocity control.

   • Compatible with Rexroth’s drive controllers, enabling closed-loop operation.

3. Robust Mechanical Design

   • Brushless, maintenance-free motor with lifetime-lubricated bearings.

   • IP65-rated housing provides protection against dust and water spray.

   • Built to withstand challenging industrial environments.

4. Ease of Integration

   • DIN-standard flange (DIN 42948) for direct mechanical replacement.

   • Universal rotatable connector simplifies cabling in constrained machine layouts.

   • Supported by Rexroth’s plug-and-play approach: encoder memory stores motor data, reducing commissioning time.

5. Energy Efficiency and Safety

   • High torque-to-inertia ratio ensures fast dynamic response with low power losses.

   • Temperature sensors integrated for overload protection.

   • Insulation class F guarantees long-term reliability under thermal stress.

Technical Data (MHD041B-144-NP1-UN)

Application Areas

The MHD041B-144-NP1-UN is tailored for medium-duty automation applications where torque density and precise motion control are critical:

• Machine Tools: For auxiliary axes, tool changers, and feed drives requiring quick, precise motion.

• Packaging Industry: Accurate positioning for filling, sealing, and labeling stations.

• Robotics: Pick-and-place operations, compact articulated robots, and linear handling systems.

• Printing and Paper: Reliable speed synchronization for rollers, cutters, and feed drives.

• Textiles: Continuous duty tasks needing consistent torque at varying speeds.

• Material Handling: Conveyor drives and palletizing systems requiring durable performance.

Design and Construction

The motor is engineered for durability and precision:

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

• Stator: Efficient copper winding design reduces electrical losses.

• Encoder System (NP1): Provides absolute digital position feedback, enhancing precision.

• Bearings: Sealed, lifetime-lubricated bearings for maintenance-free operation.

• Housing: Lightweight aluminum, optimized for thermal dissipation under convection cooling.

Its electronic commutation guarantees smooth torque output, essential for high-speed start-stop cycles in automation.

Advantages for End Users

• Compact yet Powerful: Medium-length housing boosts torque while keeping size manageable.

• Precision Control: Encoder feedback ensures superior accuracy in motion tasks.

• Rugged Reliability: IP65 housing and class F insulation safeguard performance.

• Low Maintenance: Brushless design and sealed bearings minimize service requirements.

• Seamless Integration: Standard mounting and connector flexibility simplify installation.

Ordering Information

• Product Name: Rexroth Synchronous Servo Motor MHD041B-144-NP1-UN

• Order Number: R911281505

• Series: Bosch Rexroth MHD Servo Motors

Pairing this motor with Rexroth IndraDrive controllers and certified cabling guarantees maximum performance and compatibility.

Conclusion

The Bosch Rexroth MHD041B-144-NP1-UN (R911281505) is a compact, medium-length synchronous servo motor designed for automation environments demanding precision, torque density, and durability. With its NP1 configuration (shaft with keyway plus encoder), IP65 housing, and reliable feedback technology, it offers an excellent balance of power, accuracy, and longevity.

Engineers, system integrators, and OEMs will find this motor an optimal solution for applications in machine tools, robotics, packaging, and industrial handling, where uptime and accuracy are critical. By integrating this motor, users benefit from Rexroth’s legacy of engineering excellence, ensuring consistent productivity and reduced total cost of ownership.