Bosch Rexroth MHD115C-058-PG1-BA – Zero-Backlash Feedback, Ready for Safety Applications

The Bosch Rexroth MHD115C-058-PG1-BA is a high-performance permanent magnet AC servo motor from the MHD series, engineered for dynamic positioning, speed control, and torque accuracy in industrial automation. Featuring a robust 115 mm flange, oil-resistant shaft seal, and integrated 24-bit absolute encoder, this motor delivers exceptional responsiveness and reliability—especially in demanding applications like machine tools, robotics, and material handling.

Application Scenarios

In a high-speed bottling line in Southeast Asia, frequent servo failures occurred due to lubricant mist infiltrating motor shafts, causing encoder contamination and position drift. The integrator replaced standard servos with the Bosch Rexroth MHD115C-058-PG1-BA, leveraging its PG1 oil-sealed shaft design and absolute encoder that retains position data during power cycles. The result? Zero encoder-related downtime over 14 months, even in a humid, oily environment. Operators also benefited from smoother motion profiles during label application—thanks to the motor’s low cogging and high torque density—reducing product waste by 18%. This case demonstrates how the MHD115C-058-PG1-BA transforms motion reliability in real-world, contamination-prone settings.

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Technical Principles and Innovative Values

Innovation Point 1: PG1 Oil-Sealed Shaft for Contamination Resistance

Unlike standard servos, the MHD115C-058-PG1-BA integrates a specialized radial shaft seal rated for exposure to oils, greases, and cutting fluids—critical in metalworking, food processing, and packaging where fluid ingress causes premature bearing or encoder failure.

Innovation Point 2: 24-Bit Absolute Encoder Eliminates Homing

The built-in BA absolute encoder provides precise position feedback at power-up—no need for homing routines. This reduces cycle time in pick-and-place robots and ensures safety compliance in collaborative applications by maintaining known axis positions after emergency stops.

Innovation Point 3: Optimized Electromagnetic Design for Smooth Torque

Advanced winding and magnet placement minimize torque ripple (<1.5%), enabling vibration-free operation at low speeds—essential for surface finishing, glass handling, or precision dispensing where jitter causes defects.

Innovation Point 4: Plug-and-Play with Rexroth Drive Ecosystem

When paired with IndraDrive units, the MHD115C-058-PG1-BA auto-configures via motor ID chip, reducing commissioning time by up to 70%. Parameters like thermal limits, inertia, and feedback type are loaded automatically.

Application Cases and Industry Value

At a German automotive stamping plant, a robotic transfer system used older incremental-feedback servos that required daily homing, delaying morning startups. After upgrading to the Bosch Rexroth MHD115C-058-PG1-BA, the system achieved “instant-on” readiness—saving 22 minutes per shift. Additionally, the motor’s IP65 rating withstood constant coolant spray, extending maintenance intervals from 6 to 18 months. In another case, a Swiss medical device assembler integrated the MHD115C-058-PG1-BA into a micro-syringe filling station. Its ultra-smooth motion prevented fluid splashing, while the absolute encoder ensured traceability for every dose—meeting stringent FDA 21 CFR Part 11 requirements. Customers consistently highlight its “set-and-forget” reliability and motion quality as key differentiators.

Installation, Maintenance, and Full-Cycle Support

Installing the MHD115C-058-PG1-BA follows standard IEC B5 practices: align the flange, secure with M8 bolts, and connect motor and encoder cables using Rexroth-compatible connectors (e.g., RKL series). Ensure proper grounding via the motor housing lug. The natural cooling design eliminates fan noise and maintenance, though ambient temperature should remain below +40°C for continuous duty. The oil seal requires no servicing but should be inspected annually in extreme environments.

For diagnostics, the absolute encoder enables immediate position verification at startup. If replacement is needed, the MHD115C-058-PG1-BA’s standardized dimensions and connector layout allow drop-in swaps without mechanical redesign. We rigorously test every motor for insulation resistance, encoder integrity, torque curve validation, and seal integrity under simulated oil exposure. Each unit ships with full documentation and is backed by an 18-month warranty and expert motion control support.

Contact us for a customized solution—whether you’re retrofitting legacy machinery, designing a new robotic cell, or scaling an OEM production line, the MHD115C-058-PG1-BA delivers precision, durability, and seamless integration you can trust.