Rexroth Synchronous Servo Motor MHD071B-061-NP0-UN (Order Number )
Overview
The Bosch Rexroth MHD071B-061-NP0-UN is a synchronous AC servo motor belonging to the MHD series, renowned for its precision, durability, and adaptability in industrial automation. This specific motor is optimized for high-speed applications where dynamic performance, reliability, and compact design are crucial.
The type code provides valuable insights into its configuration:
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071 – Frame size: 115 mm flange diameter and 95 mm centering diameter.
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B – Medium-length housing for improved torque output.
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061 – Winding optimized for higher characteristic speeds of up to 4500 rpm.
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NP0 – Shaft with keyway (N option), no holding brake (0 option), and encoder feedback (P option).
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UN – Universal rotatable connectors, natural convection cooling.
With order number R911272384, this motor can be precisely identified for procurement, integration, and replacement, reducing the risk of mismatched configurations.
Key Features
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High-Speed Design
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Characteristic motor speed: 4500 rpm, significantly higher than 035 winding versions.
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Rated speed options up to 5000 rpm, supporting demanding dynamic cycles.
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Optimized Torque and Power Output
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Continuous torque at standstill: 8.0 Nm at 60K overtemperature.
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Peak torque: up to 32.0 Nm, allowing for acceleration-intensive applications.
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Rated power up to 4.8 kW, delivering strong performance across diverse use cases.
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Encoder Feedback Precision
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Servo feedback encoder ensures precise control of position and velocity.
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Closed-loop regulation delivers smooth, accurate, and repeatable motion.
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Robust Electrical Parameters
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Torque constant: 0.77 Nm/A at 20 °C.
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Voltage constant: 70 V/1000 rpm, making it suitable for high-speed drive systems.
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Peak current handling: 50.5 A, supporting rapid torque response.
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Durable and Safe Construction
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IP65 degree of protection: sealed against dust and water spray.
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Insulation class F ensures thermal robustness in continuous operation.
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Lifetime-lubricated bearings for reduced maintenance.
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Compact Medium Housing
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Medium-length housing balances torque capability with a compact footprint.
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Weight of 8.8 kg, ensuring easy installation without compromising rigidity.
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Technical Data (MHD071B-061-NP0-UN)
| Specification | Value |
| Product Type | Rexroth Synchronous Servo Motor MHD071B-061-NP0-UN |
| Order Number | R911272384 |
| Cooling Method | Natural convection |
| Frame Size | 071 (115 mm flange, 95 mm centering) |
| Frame Length | B (medium housing) |
| Characteristic Motor Speed (nK) | 4500 rpm |
| Continuous Torque at Standstill (MdN, 60K) | 8.0 Nm |
| Continuous Current at Standstill (IdN, 60K) | 11.2 A |
| Rated Speeds (nN) | 4000 rpm / 5000 rpm |
| Rated Torque (MN) | 1.7 Nm / 5.3 Nm / 7.8 Nm |
| Rated Current (IN) | 1.7 A / 5.5 A / 7.7 A |
| Rated Power Output (PN) | 0.8 kW / 3.4 kW / 4.8 kW |
| Rated Voltage (UN) | 283 V / 368 V / 380 V |
| Rated Frequency (fN) | 267 Hz / 333 Hz |
| Peak Current (Imax) | 50.5 A |
| Maximum Torque (Mmax) | 32.0 Nm |
| Moment of Inertia (J) | 8.7 × 10⁻⁴ kg·m² |
| Thermal Time Constant (Tth) | 45 min |
| Maximum Speed (nmax) | 6000 rpm |
| Motor Mass (m) | 8.8 kg |
| Encoder | Digital servo feedback (NP option) |
| Shaft Type | Shaft with keyway (N option) |
| Holding Brake | Without (option 0) |
| Connector Orientation | Universal, rotatable |
| Degree of Protection | IP65 |
| Insulation Class | F |
| Ambient Operating Temperature | 0 – 40 °C |
| Storage Temperature | -20 – +80 °C |
| Max. Installation Altitude | ≤1000 m above sea level |
Applications
The MHD071B-061-NP0-UN is particularly suited for high-speed and precision-driven applications, including:
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Machine Tools: High-speed spindle drives, tool changers, and auxiliary axes.
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Robotics: Axes requiring rapid accelerations and lightweight dynamic performance.
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Packaging Machinery: High-speed labeling, sealing, and pick-and-place processes.
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Printing Systems: Rollers, feeders, and cutters demanding accurate synchronization at high speed.
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Textile Equipment: High-speed yarn transport and weaving processes.
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Automated Handling: Conveyor systems needing precision at fast cycle rates.
Design and Construction
The motor is constructed with Bosch Rexroth’s advanced synchronous design principles:
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Rotor: Permanent magnet rotor ensures compact high-torque density.
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Stator: Precision windings optimized for high-speed efficiency.
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Encoder: Integrated for precise digital feedback.
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Housing: Aluminum with RAL 9005 black primer coating for corrosion resistance.
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Bearings: Lifetime lubrication ensures minimal servicing needs.
The medium-length housing allows a balance between power capacity and compactness, making it versatile for modern machine layouts.
Advantages for End Users
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Speed and Precision: Rated for up to 5000 rpm with closed-loop encoder feedback.
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Reliability: IP65 and insulation class F guarantee performance in tough environments.
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Compact Power: 8.8 kg motor mass with high output up to 4.8 kW.
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Low Maintenance: Sealed, lubricated-for-life bearings reduce downtime.
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Integration Ease: Rotatable connectors simplify cabling in space-limited machines.
Ordering Information
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Product Name: Rexroth Synchronous Servo Motor MHD071B-061-NP0-UN
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Order Number: R911272384
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Series: Bosch Rexroth MHD Servo Motors
Conclusion
The Bosch Rexroth MHD071B-061-NP0-UN (R911272384) is a medium-frame, high-speed synchronous servo motor designed for industrial users seeking a combination of high rotational speed, precise feedback control, and robust performance. Its NP0 configuration—shaft with keyway, encoder, without holding brake—makes it ideal for applications where continuous holding is unnecessary but precision and high speed are essential.
With rated powers up to 4.8 kW, peak torque of 32 Nm, and speeds up to 5000 rpm, this motor is the perfect solution for machine tools, robotics, packaging, printing, and high-speed handling systems. Engineered by Bosch Rexroth, it offers durability, flexibility, and seamless integration, ensuring long-term efficiency and performance in demanding environments.
