BOSCH REXROTH MKD025B-144-KG1-UN – Compact IndraDyn AC Servo Motor for High-Precision, Small-Axis Motion

The BOSCH REXROTH MKD025B-144-KG1-UN is a compact IndraDyn servo motor built for fast, accurate positioning on smaller axes—think indexing tables, pick-and-place heads, narrow conveyors, or labeling spindles. One thing I appreciate is how the MKD series balances torque density with smooth running at low speeds; in many cases, you get crisp response without having to oversize the drive. The “025B” frame and length B keep the footprint lean, while the “144” winding is commonly tuned for mid-to-high speed ranges with good dynamic torque. The “K” shaft code indicates a keyed shaft (easy coupling), and the “UN” variant typically includes digital feedback and a 24 V holding brake—handy for vertical axes or fail-safe positioning.

From my experience, this motor drops into both legacy DIAX systems and newer IndraDrive platforms with minimal fuss, especially when you stay with Rexroth feedback and cable sets. A packaging OEM recently told us the MKD025B cut their axis settling time by about 20% after swapping from an older generic motor, without touching the mechanical layout.

Order Placement Process & Guarantees

• Warranty: 365 days
• Lead time: Typically 1 week if in stock; no more than one month at the latest
• Payment: 50% advance payment; full payment before delivery
• Express options: FedEx, UPS, DHL

Key Features

• Compact frame 025, length B: Fits tight machine envelopes while delivering usable continuous torque for small/medium duty axes.
• Winding 144 (dynamic response): Suited for mid-to-high speed profiles with responsive acceleration, typically ideal for packaging and handling.
• Keyed shaft (K): Straightforward coupling to gearboxes and pulleys; reduces slip and simplifies alignment on retrofit jobs.
• Brake-ready “UN” variant: Typically equipped with a 24 V holding brake—useful for Z-axes or emergency holds.
• Digital encoder feedback: Clean, repeatable positioning with Rexroth drives; you might notice smoother low-speed contouring versus generic encoders.
• IP65-rated housing: Robust against dust and incidental washdown when correctly mated and sealed; good for food secondary packaging areas.
• Rexroth ecosystem compatibility: Works with IndraDrive (HCS) and many DIAX (DDS) drives; cabling and parameter sets are typically straightforward.

Technical Specifications

Related & Supporting Products

• BOSCH REXROTH MKD025B-058-KG1-UN: Same frame/length with different winding (lower base speed, higher torque at low RPM).
• BOSCH REXROTH MKD025B-144-KN1-AN: Similar motor with keyed shaft and no holding brake (AN), often chosen for horizontal axes.
• BOSCH REXROTH MSK030C series: Newer IndraDyn S motors with higher-resolution encoders; drop-in alternatives in many small-axis designs when paired with IndraDrive.
• Rexroth IndraDrive HCS01 / HCS02 drives: Recommended servo drives for MKD motors; compact, efficient, and easy to parameterize.
• Rexroth DIAX DDS02.1/03.1 drives: Common legacy pairing in existing machines; the MKD025B typically integrates without mechanical changes.
• Original Rexroth power/encoder cable sets: Ensures IP65 integrity and full feedback performance; minimizes noise issues in high-EMI cabinets.

Installation & Maintenance

• Mounting & alignment: Use the flange pattern and a rigid coupling or gearbox input. Align carefully to reduce bearing load; you might notice less heat and quieter running.
• Cabinet & wiring: Route motor power and feedback cables separately; use shielded, Rexroth-approved cables with proper strain relief and grounding.
• Ventilation: Provide free airflow around the motor body; avoid enclosing the housing unless forced ventilation is provided.
• Brake power (if equipped): 24 VDC supply with suppression; verify release/hold current in the drive parameters during commissioning.
• Routine checks: Inspect connectors and seals each service interval; keep the housing clean; verify encoder offset after mechanical work.
• Firmware & tuning: Keep the drive on a current, validated firmware. Back up parameters after final autotuning; in most cases, that prevents rework after maintenance.

Quality & Certifications

• CE compliant
• UL Recognized (varies by exact sub-variant; check nameplate and file)
• RoHS compliant
• Manufactured under ISO 9001 quality systems
• Manufacturer’s standard warranty applies; sales warranty provided for 365 days as listed above

If you need us to verify the exact brake and encoder option on your MKD025B-144-KG1-UN, a quick photo of the nameplate typically settles it. That helps us match the right cable set and drive parameters the first time.