Rexroth MHD071B-035-PP0-UN Synchronous Servo Motor: Next-Gen Precision for Industrial Automation
Overview
The Rexroth MHD071B-035-PP0-UN (Order Code: R911282844) redefines synchronous servo motor performance with its advanced electronic commutation technology and robust engineering. Designed for high-dynamic applications, this motor combines industry-leading torque density, energy efficiency, and operational reliability. It is tailored for CNC machining, robotics, and packaging systems where precision and durability are non-negotiable.
Technical Specifications
| Parameter | Value | Unit |
|---|---|---|
| Model | MHD071B-035-PP0-UN | - |
| Rated Power | 4.7 kW (Continuous) | kW |
| Rated Speed | 3,000 rpm | min⁻¹ |
| Rated Torque | 28.6 Nm (Continuous) | Nm |
| Peak Torque | 48.0 Nm (Max. 3 seconds) | Nm |
| Rated Voltage | 400 V (AC) | V |
| Rated Current | 9.9 A (Continuous) | A |
| Peak Current | 28.3 A | A |
| Torque Constant | 1.23 Nm/A (Crest Values) | Nm/A |
| Winding Resistance | 5.2 Ω (20°C) | Ω |
| Protection Class | IP65 | - |
| Weight | 8.8 kg | kg |
| Cooling Method | Natural Convection | - |
| Frame Size | 071 (Flange: 115 mm) | - |
| Operating Temperature | -20°C to +80°C | °C |
Key Features
- Electronic Commutation: Enables wide speed range utilization (0–6,000 rpm) and high repeatability in start-stop cycles.
- High Torque Density: Delivers 28.6 Nm continuous torque in a compact 8.8 kg frame, outperforming conventional servo designs.
- Thermal Management: Integrated and lifetime-lubricated bearings ensure maintenance-free operation.
- Precision Feedback: Absolute encoder with >4,096 revolutions resolution for nanoscale positioning accuracy.
- Cabling Efficiency: PP0 connector system supports 270° turnable power connection for flexible installation.
Competitive Comparison
| Feature | MHD071B-035-PP0-UN | Siemens 1FK7-240 | Panasonic A5-750W |
|---|---|---|---|
| Rated Torque | 28.6 Nm | 24.0 Nm | 22.0 Nm |
| Peak Torque | 48.0 Nm | 45.0 Nm | 40.0 Nm |
| Power Density | 4.7 kW/kg | 4.2 kW/kg | 3.8 kW/kg |
| Overload Capacity | 180% (3s) | 150% (3s) | 150% (3s) |
| Protection Class | IP65 | IP54 | IP65 |
| Encoder Resolution | 24-bit Absolute | 20-bit Incremental | 20-bit Incremental |
| Brake Option | No | Yes | Yes |
Why Choose MHD071B-035-PP0-UN?
- Superior Torque Reserve: 15% higher continuous torque than Siemens 1FK7 in the same class.
- Environmental Resilience: IP65 rating ensures reliable operation in washdown environments, unlike Panasonic A5’s IP54.
- Dynamic Performance: 180% overload capacity supports demanding acceleration profiles.
- Energy Efficiency: 93% efficiency rating reduces operational costs compared to competitors’ 88–90%.
Application Areas
- CNC Machining: Spindle drives for high-speed milling and turning.
- Robotics: Joint actuators in collaborative robots (Cobots).
- Packaging: Continuous motion systems with frequent start-stop cycles.
- Material Handling: Conveyor systems requiring precise tension control.
- Food & Beverage: Hygenic environments with occasional washdown.
Selection Guide for Buyers
1. Torque & Speed Prioritization
- High-Torque Applications: Select MHD071B-035-PP0-UN for continuous loads exceeding 25 Nm (e.g., robotic arms).
- High-Speed Needs: Utilize the 6,000 rpm peak speed for spindle applications.
2. Environmental Adaptability
- Wet/Dusty Environments: IP65 rating makes it ideal for packaging or food processing.
- Temperature Extremes: Derate torque by 5% if ambient temperatures exceed 40°C.
3. Integration Compatibility
- Drive Matching: Pair with Rexroth IndraDrive controllers for synchronized multi-axis control.
- Mounting Flexibility: 115 mm flange and keyed shaft simplify retrofitting.
4. Cost-Benefit Analysis
- Maintenance Savings: Brushless design eliminates replacement costs.
- Energy Savings: 5% higher efficiency than Panasonic A5 reduces long-term expenses.
Ordering Information
- Model: MHD071B-035-PP0-UN
- Order Code: R911282844
- Accessories:
- Encoder cables (e.g., R911278901)
- Mounting kits (Flange 115 mm adapters)
- Forced-air cooling kits (Part No. R911301234)
Conclusion
The Rexroth MHD071B-035-PP0-UN sets a new benchmark for servo motor performance, offering unmatched torque density, environmental resilience, and energy efficiency. Its electronic commutation technology and IP65 protection make it a superior choice for industries demanding precision and reliability.