Bosch Rexroth MHD071B-061-NG1-UN Synchronous Servo Motor

Product Overview

The Bosch Rexroth MHD071B-061-NG1-UN is a high-performance synchronous servo motor designed for industrial automation applications requiring precise motion control, exceptional dynamic response, and reliable operation. As part of Rexroth's renowned MHD series, this motor incorporates advanced engineering and robust construction to meet the demanding requirements of modern manufacturing environments. With its superior control accuracy, excellent torque characteristics, and high overload capacity, the MHD071B-061-NG1-UN is an ideal solution for various automated systems, including robotics, CNC machinery, packaging equipment, and material handling systems.

This motor is designed to seamlessly integrate with Rexroth's range of servo drives and controllers, providing a complete motion solution. The order number R911275109 ensures easy identification and ordering for replacement or new system design purposes.

Technical Specifications

The MHD071B-061-NG1-UN offers a balanced combination of power, speed, and precision, making it suitable for diverse industrial applications. Below are its key technical parameters:

Note: Some specific values for the NG1 variant (like rated torque) might vary slightly. Always consult the latest datasheet for precise specifications.

Key Features and Benefits

• Precision Control and High Dynamic Response: The MHD071B-061-NG1-UN utilizes a high-resolution multi-turn absolute encoder (e.g., 23-bit)

. This provides exceptional position feedback accuracy, enabling precise positioning and smooth velocity control. Its low rotor inertia facilitates rapid acceleration and deceleration, which is crucial for applications with short cycle times

• .

• Robust Construction and High Protection Level: With an IP65 protection rating, this motor is effectively sealed against dust ingress and low-pressure water jets from any direction

• . This makes it suitable for operation in challenging environments commonly found in industries like food and beverage, chemical processing, or metalworking, where exposure to coolants, washdowns, or particulate matter is possible.

• High Overload Capacity: The motor is designed to deliver high peak torque (typically up to 3 times the rated torque for short periods)

• . This allows it to handle sudden load surges, overcome static friction during startup, and accelerate heavy loads efficiently without stalling, ensuring stability and reliability in dynamic applications.

• High Efficiency and Energy Savings: The motor features an optimized electromagnetic design and high-quality materials that minimize energy losses

• . This translates to reduced operating costs and less heat generation, contributing to longer component lifespan.

• Easy Integration and Flexibility: The motor supports various fieldbus protocols such as EtherCAT and Profinet

• . This flexibility allows for seamless connection to different automation architectures. Furthermore, the availability of different brake and encoder options within the series enables customization to meet specific application needs.

• Simplified Maintenance and Diagnostics: The integrated absolute encoder eliminates the need for homing routines after power cycles, reducing downtime. Modern feedback systems often include diagnostic features that can help predict maintenance needs and quickly identify potential issues

• .

Typical Applications

The MHD071B-061-NG1-UN servo motor is versatile and can be deployed in numerous precision motion control applications:

• Machine Tool: Controlling spindle movements, feed axes, and tool changers in CNC milling machines, lathes, and grinders for high-precision machining

• .

• Packaging Machinery: Driving conveyors, filling heads, sealing jaws, and labeling units where precise synchronization and high speeds are critical

• .

• Robotics: Acting as a reliable joint actuator in industrial robots (e.g., articulated, SCARA) requiring accurate positioning and repeatability

• .

• Automated Assembly Lines: Powering pick-and-place units, precision screwdriving stations, and precision assembly tasks

• .

• Material Handling: Controlling the movement in automated guided vehicles (AGVs), sorting systems, and conveyor belts

• .

• Textile, Printing, and Paper Machinery: Ensuring precise tension control and registration in web handling processes

• .

How to Select the Right Servo Motor (A Guide for Buyers)

Selecting the appropriate servo motor is crucial for optimal system performance and longevity. Here is a structured guide to help you through the process:

1. Define Application Requirements:

   • Load Characteristics: Determine the mass, dimensions, and type of load (e.g., linear, rotational) the motor will drive.

   • Motion Profile: Analyze the required speed, acceleration, deceleration, and duty cycle. Calculate the load inertia (J_L).

   • Positioning Accuracy: Define the necessary precision and repeatability for the application, which influences encoder selection.

   • Mechanical Integration: Consider the mounting configuration (flange, foot), shaft type (keyway, smooth), and required connections.

2. Perform Key Calculations:

   • Torque Calculation: Calculate the total torque required. This includes acceleration torque (T_a = J_total × α, where α is angular acceleration) and friction torque (T_f). The peak torque needed during operation must be less than the motor's maximum torque.

   • RMS Torque Calculation: Calculate the Root Mean Square (RMS) torque based on the motion profile. The continuous torque capability of the motor should exceed this RMS value.

   • Inertia Matching: Calculate the ratio of the load inertia (J_L) reflected to the motor shaft to the motor rotor inertia (J<sub>M</sub]). A general rule of thumb is to aim for an inertia ratio (J_L / J_M) of less than 10:1, and for highly dynamic applications, ideally 3:1 to 5:1 or lower

• • . A high inertia ratio can lead to instability and require more tuning effort.

  • Speed Requirements: Ensure the motor's rated speed and maximum speed meet or exceed the application's demands.

• Select the Motor and Drive:

  • Choose a motor whose rated torque and peak torque satisfy the calculated continuous and peak requirements with a safety margin (often 15-30%). The MHD071B-061-NG1-UN, for instance, offers a substantial peak torque overload.

  • Ensure the motor's inertia is suitable for achieving the desired inertia ratio.

  • Verify the compatible amplifier or servo drive (e.g., Rexroth IndraDrive) is selected based on the motor's current, voltage, and power requirements

• • . The drive must supply sufficient current for both continuous and peak torque demands.

• Consider Environmental and Ancillary Factors:

  • Assess the operating environment (temperature, humidity, contaminants) to confirm the motor's protection rating (IP65 for this model) and insulation class are adequate

• .

• Decide if a brake (hold brake) is necessary for safety (e.g., preventing vertical loads from dropping during power loss)

4. • .

   • Ensure the motor's feedback system (encoder) matches the requirements of the chosen servo drive and controller.

   • Confirm connection compatibility (plugs, connectors) between motor, feedback, and drive.

Recommendation: Utilize manufacturer resources. Contact Rexroth or your supplier's technical support team. Provide them with your detailed application requirements and calculations. They often have configuration and selection tools (like Rexroth's IndraSize) that can significantly simplify the process and ensure optimal component matching

.

Why Choose This Motor?

The Bosch Rexroth MHD071B-061-NG1-UN synchronous servo motor (Order Number: R911275109) represents a blend of precision engineering, durability, and performance. Its robust design ensures reliability in harsh industrial environments, while its advanced features facilitate precise control and high efficiency. By following the structured selection guide, you can confidently integrate this motor into your system, ensuring optimal performance and productivity.