Rexroth Synchronous Servo Motor MHD071B-061-PG1-UN (Order Number R911273676)

Overview

The Bosch Rexroth MHD071B-061-PG1-UN is a synchronous AC servo motor specifically engineered to deliver high-speed, high-precision, and reliable motion control in industrial automation systems. As a member of the MHD series, it integrates state-of-the-art permanent magnet technology, a robust housing, and advanced encoder feedback.

The type code reveals its configuration:

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

• B – Medium-length housing, providing a balance of torque output and compactness.

• 061 – Winding for higher speeds, with characteristic speed up to 4500 rpm.

• PG1 – Shaft with keyway, equipped with encoder feedback, and includes a holding brake.

• UN – Rotatable universal connectors with natural convection cooling.

The dedicated order number R911273676 ensures buyers receive the exact configuration required, preventing mismatches during integration or replacement.

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Key Features

1. High-Speed Capability

   • Characteristic motor speed: 4500 rpm.

   • Rated speeds: 4000 rpm and 5000 rpm, with a maximum speed of 6000 rpm.

2. Torque and Power Output

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

   • Peak torque: 32 Nm, ensuring excellent performance under dynamic load changes.

   • Rated power up to 4.8 kW, suitable for demanding automation tasks.

3. Encoder Precision

   • Equipped with servo feedback encoder, ensuring high-resolution position and velocity data.

   • Essential for applications requiring accuracy, smooth motion, and repeatability.

4. Integrated Holding Brake

   • The PG1 variant includes a holding brake, providing extra safety and load retention.

   • Ideal for vertical axis applications or tasks requiring secure positioning at rest.

5. Robust Electrical Properties

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

   • Voltage constant: 70 V/1000 rpm.

   • Peak current capacity: 50.5 A.

6. Durability and Protection

   • IP65 protection: sealed against dust and water spray.

   • Insulation class F for thermal safety.

   • Bearings are lifetime-lubricated for minimal maintenance.

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Technical Data (MHD071B-061-PG1-UN)

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Applications

The MHD071B-061-PG1-UN is designed for industries where safety, speed, and accuracy are essential. Typical applications include:

• Vertical Axes in Machine Tools – Holding brake secures the axis when stationary.

• Robotics – High acceleration and precision positioning in articulated arms.

• Packaging Machinery – Fast and repeatable operations in sealing and filling.

• Printing Machines – Consistent high-speed synchronization.

• Textile Systems – Smooth handling of fabric at elevated speeds.

• Material Handling – Conveyors requiring both speed and braking safety.

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How to Select the Right Model (Buyer’s Guide)

When choosing the MHD071B-061-PG1-UN or comparing it to similar models, consider the following criteria:

1. Torque Requirements

   • If your application demands high acceleration or handling of variable loads, ensure that the 32 Nm peak torque matches your cycle demands.

   • For static load holding (e.g., vertical axes), the integrated brake is critical.

2. Speed Range

   • Rated speeds of 4000–5000 rpm with maximum 6000 rpm make it suitable for high-speed cycles.

   • Ensure the machine control system supports the required frequency and voltage range.

3. Encoder Feedback

   • PG1 includes servo feedback, providing accurate positional data.

   • Essential for robotics and precision automation tasks where repeatability is key.

4. Brake Requirement

   • If your axis must hold position without drift or safety concerns, select PG1 with brake.

   • For horizontal axes, PG0 (no brake) may be sufficient and more cost-effective.

5. Cooling Method

   • This motor uses natural convection cooling.

   • For extreme duty cycles, surface-cooled or liquid-cooled options may be preferable.

6. Environmental Conditions

   • IP65 rating allows installation in dusty or damp environments.

   • For outdoor or high-temperature settings, verify insulation and cooling requirements.

7. Integration and Space

   • Medium housing provides compact installation without compromising power.

   • Rotatable connectors simplify wiring in tight spaces.

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Advantages

• Precision and Safety – Encoder plus holding brake ensures secure and repeatable motion.

• High Performance – Strong torque and speed range, supporting up to 4.8 kW.

• Durable Design – IP65 protection and class F insulation ensure reliability.

• Compact but Powerful – Only 8.8 kg, yet capable of heavy-duty tasks.

• Flexibility – Universal connectors aid integration into different machine layouts.

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Ordering Information

• Product Name: Rexroth Synchronous Servo Motor MHD071B-061-PG1-UN

• Order Number: R911273676

• Series: Bosch Rexroth MHD Servo Motors

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Conclusion

The Bosch Rexroth MHD071B-061-PG1-UN (R911273676) is a high-performance synchronous servo motor designed for applications requiring high speed, precise encoder feedback, and integrated braking. With torque up to 32 Nm, speeds up to 6000 rpm, and a rated power of 4.8 kW, it is a versatile choice for machine tools, robotics, and packaging machinery.

When selecting this motor, buyers should carefully consider torque demand, speed requirements, the necessity of a brake, and cooling conditions. By doing so, they ensure optimal integration into their systems, maximizing both safety and productivity.