Rexroth Synchronous Servo Motor MHD071B-035-NG1-UN (Order Number R911272383)

Overview

The Bosch Rexroth MHD071B-035-NG1-UN is a high-performance synchronous servo motor belonging to the MHD family, a proven series designed for industrial automation applications requiring precision, efficiency, and rugged reliability. This motor features a medium housing length (B), a shaft with keyway, encoder integration, and convection cooling, making it a versatile option for machine tools, packaging lines, robotics, and automated handling systems.

The type designation provides key insights:

• 071 → Motor frame size with 140 mm flange.

• B → Medium-length housing.

• 035 → Winding configuration optimized for 2500 rpm base speed.

• NG1 → Shaft with keyway plus encoder configuration (absolute feedback).

• UN → Universal rotatable connectors and natural convection cooling.

Its dedicated order number R911272383 ensures exact product identification for engineering, spare parts management, and procurement purposes.

Key Features

1. Medium-Length Housing

   • Offers higher torque than shorter “A” versions while maintaining a compact form factor.

   • Continuous torque at standstill is 8.0 Nm under natural cooling.

2. Optimized Electrical Characteristics

   • Designed for 2500 rpm nominal and characteristic motor speed.

   • Rated torque up to 5.2 Nm at nominal speed, with peak torque up to 32 Nm.

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

3. Encoder and Shaft System (NG1)

   • Shaft with keyway provides reliable torque transmission to pulleys, gears, or direct couplings.

   • Digital encoder feedback guarantees precise positioning and speed regulation.

   • Compatible with Rexroth IndraDrive and EcoDrive controllers.

4. Rugged Construction

   • Protection class IP65 ensures resistance to dust and water jets.

   • Bearings are grease-lubricated for life, minimizing maintenance.

   • Insulation class F enables reliable operation in demanding environments.

5. Flexible Integration

   • DIN-standard flange design (DIN 42948).

   • Universal, rotatable power and encoder connectors for simple installation.

   • Encoder memory stores motor parameters, ensuring fast commissioning.

Technical Data (MHD071B-035-NG1-UN)

Applications

The MHD071B-035-NG1-UN is ideally suited for:

• Machine Tools: Auxiliary and feed drives requiring accuracy.

• Robotics: Axis drives in articulated robots and pick-and-place systems.

• Packaging Machinery: Precision-driven labeling, sealing, and cutting systems.

• Textile Machinery: Continuous operations demanding steady torque output.

• Printing Systems: Synchronization of rollers and cutters.

• Material Handling: Conveyors and sortation drives.

Design and Construction

• Rotor: Permanent magnets for compactness and high torque density.

• Stator: High-efficiency copper windings minimize energy losses.

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

• Housing: Aluminum housing, naturally cooled, with IP65 sealing.

• Bearings: Lifetime-lubricated for reduced maintenance requirements.

The motor design ensures smooth torque delivery, high dynamic response, and long service life.

Advantages for End Users

• Compact but Powerful: High torque-to-size ratio.

• Reliable: IP65 and class F insulation ensure durability.

• Precise: Encoder-driven feedback ensures accuracy.

• Low Maintenance: Brushless design with sealed bearings.

• Flexible Integration: Standard flange and rotatable connectors.

Ordering Information

• Product Name: Rexroth Synchronous Servo Motor MHD071B-035-NG1-UN

• Order Number: R911272383

• Series: Rexroth MHD Synchronous Servo Motors

Conclusion

The Bosch Rexroth MHD071B-035-NG1-UN (R911272383) is a high-precision synchronous servo motor offering robust performance for medium-duty industrial automation. With its NG1 configuration—shaft with keyway, digital encoder, and holding brake—it provides an optimal combination of power, control accuracy, and reliability.

This motor is the right choice for OEMs, system integrators, and end-users looking for dependable automation components in machine tools, robotics, packaging, and handling systems. It exemplifies Bosch Rexroth’s legacy of engineering excellence, ensuring long service life, reduced maintenance, and consistent productivity.