Rexroth Synchronous Servo Motor MHD071B-061-PG0-UN (Order Number R911273675)

Overview

The Bosch Rexroth MHD071B-061-PG0-UN is a synchronous AC servo motor designed for high-speed, precision-oriented industrial applications. As part of the MHD series, this motor exemplifies Bosch Rexroth’s dedication to producing robust, efficient, and versatile drive solutions.

Its type designation tells us exactly what it offers:

• 071 – Frame size: a compact 115 mm flange with 95 mm centering diameter.

• B – Medium-length housing for balanced torque and size.

• 061 – High-speed winding variant with characteristic speeds up to 4500 rpm.

• PG0 – Equipped with a shaft featuring a keyway, encoder feedback, and no holding brake.

• UN – Rotatable universal connectors and natural convection cooling.

The exact order number R911273675 ensures customers receive the precise variant required for integration or replacement, guaranteeing compatibility and performance.

Key Features

1. High-Speed Performance

   • Designed for applications requiring 4000–5000 rpm rated speeds, with a maximum operating speed of 6000 rpm.

   • Capable of handling rapid accelerations with low inertia and high torque output.

2. Torque and Power Delivery

   • Continuous torque at standstill: 8.0 Nm (60K overtemperature).

   • Peak torque: 32 Nm, ensuring resilience during sudden load demands.

   • Rated power options up to 4.8 kW, enabling effective operation across demanding use cases.

3. Precision Encoder Feedback

   • Integrated servo feedback encoder provides accurate position and velocity data.

   • Enables closed-loop regulation, improving repeatability and motion quality.

4. Robust Electrical Characteristics

   • Torque constant: 0.77 Nm/A at 20 °C.

   • Voltage constant: 70 V/1000 rpm, suitable for modern drive systems.

   • Peak current capability of 50.5 A, ensuring high dynamic response.

5. Durability and Protection

   • IP65 housing: dust-tight and resistant to water spray.

   • Insulation class F: ensures safe operation under elevated thermal loads.

   • Bearings: lubricated for life, reducing the need for servicing.

6. Compact and Practical

   • Medium-length housing delivers high performance without excessive size.

   • Mass of 8.8 kg, simplifying installation and handling.

Technical Data (MHD071B-061-PG0-UN)

Applications

The MHD071B-061-PG0-UN is a versatile motor suited for high-performance automation systems, including:

• Machine Tools: Ideal for auxiliary drives, feed axes, or spindle-related functions requiring accuracy at high speed.

• Robotics: Provides high acceleration and precise positioning for robotic arms.

• Packaging Machinery: Suitable for sealing, labeling, and filling at rapid cycle rates.

• Printing and Converting Machines: Ensures synchronization and high-quality motion in cutting, rolling, and feeding.

• Textile Machinery: Drives fabric handling and weaving mechanisms where consistency and speed matter.

• Material Handling Systems: Powers conveyor systems with dependable speed regulation.

Design and Construction

The motor reflects Bosch Rexroth’s advanced engineering philosophy:

• Rotor: Permanent magnet design for compact torque density.

• Stator: Optimized windings deliver efficient current-to-torque conversion.

• Encoder: Digital servo feedback for closed-loop regulation.

• Housing: Aluminum body with RAL 9005 black primer for corrosion resistance.

• Bearings: Grease-lubricated-for-life for minimal servicing.

The PG0 configuration provides an excellent balance: shaft with keyway for secure mechanical coupling, integrated encoder for precision, and no brake for simplicity in systems where braking is unnecessary.

Advantages for Users

1. High-Speed Capability – up to 5000 rpm with excellent motion stability.

2. Dynamic Performance – peak torque of 32 Nm supports fast acceleration.

3. Precision – encoder ensures smooth closed-loop control.

4. Durability – IP65 protection, class F insulation, robust housing.

5. Compact Design – medium housing offers strong torque in an 8.8 kg package.

6. Ease of Integration – rotatable connectors simplify installation in space-limited machinery.

Ordering Information

• Product Name: Rexroth Synchronous Servo Motor MHD071B-061-PG0-UN

• Order Number: R911273675

• Series: Bosch Rexroth MHD Servo Motors

Conclusion

The Bosch Rexroth MHD071B-061-PG0-UN (R911273675) is a medium-frame synchronous servo motor designed for high-speed and precision motion applications. With a rated power up to 4.8 kW, continuous torque of 8.0 Nm, and speeds up to 6000 rpm, it is an excellent choice for machine tools, robotics, packaging, and printing systems.

Its PG0 configuration—shaft with keyway, encoder, no holding brake—makes it particularly versatile for installations where secure coupling and accurate feedback are needed without additional braking mechanisms.

For engineers and system integrators seeking a robust, high-speed, and reliable drive solution, the MHD071B-061-PG0-UN represents one of Bosch Rexroth’s finest offerings, ensuring performance consistency, energy efficiency, and long operational life.