Rexroth Synchronous Servo Motor MHD071B-035-PG1-UN (Order Number R911273363)

Overview

The Bosch Rexroth MHD071B-035-PG1-UN is part of the highly regarded MHD servo motor family, engineered for high precision, reliability, and adaptability in industrial automation. This medium-length synchronous servo motor is optimized for machine tools, robotics, packaging, textile, and material handling applications that demand accurate torque, efficient energy conversion, and long-term durability.

Its designation breaks down as follows:

• 071 → Frame size with a 115 mm flange, suitable for medium-to-high torque requirements.

• B → Medium-length housing, offering greater torque capacity compared to short-frame versions.

• 035 → Winding optimized for 2500 rpm nominal speed.

• PG1 → Shaft with keyway, encoder, and integrated holding brake, delivering both precision control and mechanical shaft locking when powered down.

• UN → Universal rotatable connectors with natural convection cooling.

With the dedicated order number R911273363, customers can be assured of precise identification, correct compatibility, and straightforward integration into their systems.

Key Features

1. Performance and Torque

   • Continuous standstill torque: 8.0 Nm under 60K overtemperature rise.

   • Peak torque capacity up to 32 Nm, enabling short bursts of high power.

   • Rated torque at nominal speed: 5.2 Nm, ideal for steady, reliable operations.

2. Encoder and Brake Integration (PG1)

   • Encoder feedback ensures highly precise speed and position control.

   • Integrated holding brake secures the motor shaft when stationary, critical for vertical axes or safety-related tasks.

3. Robust Electrical Characteristics

   • Torque constant: 1.38 Nm/A at 20 °C.

   • Voltage constant: 125 V/1000 rpm, ensuring compatibility with Rexroth IndraDrive controllers.

   • Peak current handling of 28.3 A, supporting rapid acceleration.

4. Durability and Safety

   • Degree of protection: IP65 for dust and water spray resistance.

   • Insulation class: F, supporting extended motor life under thermal loads.

   • Bearings are lifetime-lubricated, reducing maintenance requirements.

5. Ease of Integration

   • DIN-standard flange ensures mechanical compatibility.

   • Universal rotatable connectors make wiring flexible and accessible.

   • Encoder memory simplifies setup with Rexroth drives.

Technical Data (MHD071B-035-PG1-UN)

Applications

The MHD071B-035-PG1-UN is versatile across many sectors:

• Machine Tools: Feed axes, tool changers, spindle positioning.

• Robotics: Axis drives requiring precise movement and brake-supported safety.

• Packaging Systems: Labeling, sealing, and synchronized multi-axis processes.

• Textile Machines: Continuous duty cycles with precision synchronization.

• Printing and Paper Handling: Rollers and cutters requiring repeatable accuracy.

• Material Handling: Conveyor drives with safe holding brake functionality.

Design and Construction

The MHD071B-035-PG1-UN features Rexroth’s robust engineering:

• Rotor: Permanent magnet rotor, compact yet high torque.

• Stator: Optimized copper windings reduce electrical losses.

• Brake: Holding brake integrated for secure shaft locking.

• Encoder: Provides digital feedback for closed-loop control.

• Housing: Durable aluminum housing, black primer finish (RAL 9005).

• Bearings: Lifetime-lubricated, ensuring reduced maintenance.

Advantages for End Users

• Compact High Torque: Balanced size-to-power ratio.

• Precision with Safety: Encoder ensures accuracy, brake secures vertical axes.

• Reliable and Durable: IP65, insulation class F, robust mechanical build.

• Flexible Setup: Rotatable connectors simplify wiring.

• Low Maintenance: Brushless design with sealed bearings.

Ordering Information

• Product Name: Rexroth Synchronous Servo Motor MHD071B-035-PG1-UN

• Order Number: R911273363

• Series: Rexroth MHD Synchronous Servo Motors

Conclusion

The Bosch Rexroth MHD071B-035-PG1-UN (R911273363) is a medium-length synchronous servo motor designed to deliver precision, efficiency, and safety. Its PG1 configuration—shaft with keyway, encoder, and integrated holding brake—makes it a strong choice for applications requiring both precise closed-loop motion and secure holding capability.

This motor excels in machine tools, robotics, packaging, textiles, and handling systems, offering dependable operation, long service life, and seamless integration into advanced automation solutions. It reflects Rexroth’s commitment to delivering world-class engineering and industrial reliability.