Rexroth MHD112B-058-PG1-BN Servo Motor Perfectly Suited for Machine Tools and Robotics in Industrial Automation

Rexroth MHD112B-058-PG1-BN Synchronous Servo Motor

Order Number: R911284697

Overview

The Rexroth MHD112B-058-PG1-BN is a high-performance synchronous servo motor from the renowned MHD series, designed and manufactured by Bosch Rexroth to meet the rigorous demands of modern industrial automation. This motor combines precision, reliability, and versatility, making it an ideal choice for applications requiring high dynamic response, accurate positioning, and robust performance in challenging environments.

With its advanced design and integration capabilities, the MHD112B-058-PG1-BN is particularly suited for use in machine tools, packaging machinery, robotics, and other precision-driven automation systems. It is compatible with Rexroth’s digital drive controllers, ensuring seamless integration and optimized performance within sophisticated motion control systems.

Key Features

1. High Dynamic Performance
   The motor delivers excellent torque and speed characteristics, enabling rapid acceleration and deceleration. This makes it ideal for applications with frequent start-stop cycles or high positioning accuracy requirements.

2. Robust Construction
   Built to withstand harsh industrial environments, the motor features a durable housing with a high degree of protection (IP65 as standard), ensuring resistance to dust, moisture, and coolants.

3. Integrated Encoder System
   Equipped with a high-resolution digital encoder, the motor provides precise feedback for closed-loop control. The encoder stores motor parameters, facilitating quick commissioning and reducing setup time.

4. Flexible Cooling Options
   Depending on the application load, the motor can be operated with natural convection, surface cooling (via attached blower), or even liquid cooling for extreme duty cycles.

5. Holding Brake Option
   An optional holding brake is available for applications requiring safe holding of axes in de-energized states, such as vertical axes or emergency stop scenarios.

6. Compliance and Certification
   The motor complies with international standards such as CE, UL, and cUR, ensuring safety and reliability across global markets.

Technical Specifications

The following table summarizes the key technical data of the MHD112B-058-PG1-BN motor:

Note: Exact values depend on motor configuration and operating mode. Refer to the technical data sheet for detailed specifications.

Design and Construction

The MHD112B-058-PG1-BN motor is designed in accordance with international standards (e.g., DIN, IEC) and features a B05 flange mounting design (IM B5, V1, V3 per EN 60034-7). The housing is finished with a black prime coat (RAL 9005), providing resistance against environmental factors such as diluted acids and lyes.

The output shaft is available in two variants: plain shaft for friction-locked connections (recommended for high dynamic applications) and shaft with featherkey (DIN 6885) for torque transmission with constant direction. A radial shaft sealing ring (DIN 3760, material FPM/Viton) is integrated to protect against contaminants.

Application Notes

The motor is suitable for a wide range of industrial applications, including:

• Machine Tools: High-precision milling, turning, and grinding machines.

• Packaging Machinery: High-speed filling, labeling, and wrapping systems.

• Robotics: Articulated arms, gantry systems, and automated guided vehicles (AGVs).

• Material Handling: Conveyors, lifts, and palletizing systems.

• Printing and Paper Processing: Web handling, cutting, and printing presses.

For applications involving high vibration or shock loads (e.g., presses, punches), it is recommended to use motors without attached blowers and to consider shock-absorbing mounting.

Installation and Commissioning

The motor should be mounted by qualified personnel following the instructions provided in the documentation. Key steps include:

• Ensuring a clean, dry environment during installation.

• Using recommended screws and tightening torques (e.g., M12 screws with 87 Nm for MHD112 frame).

• Proper alignment to avoid redundant bearing and excessive radial or axial loads.

• Connecting power and encoder cables using Rexroth-ready cable sets for optimal performance.

Before commissioning, verify that the holding brake (if equipped) meets the specified torque and that all electrical connections are secure and correctly wired.

Maintenance and Service

The MHD motor is designed for maintenance-free operation under normal conditions. However, periodic checks are recommended:

• Cooling Ribs: Keep clean to ensure efficient heat dissipation.

• Bearings: Replace after 30,000 hours of operation or if unusual noise is detected.

• Cables: Inspect regularly for damage and replace if necessary.

• Holding Brake: Perform functional tests and grinding-in if used infrequently to prevent rust formation.

For service and support, contact the Rexroth helpdesk or authorized service center.

Ordering Information

The motor type code MHD112B-058-PG1-BN decodes as follows:

• MHD112: Motor frame size

• B: Design variant

• 058: Performance class or torque rating

• PG1: Feedback system (encoder type)

• BN: Options, e.g., holding brake, special shaft, etc.

The complete ordering number is R911284697.

Conclusion

The Rexroth MHD112B-058-PG1-BN synchronous servo motor represents a blend of advanced engineering, reliability, and performance. Its robust design, flexible configuration options, and compatibility with Rexroth drive systems make it a superior choice for demanding motion control applications. Whether used in high-speed automation, precision machining, or heavy-duty material handling, this motor delivers consistent performance and long-term durability.