As a leading supplier of reconditioned and surplus industrial automation components, Wake Industrial provides comprehensive support for all Rexroth motor brands, including sales of replacement units and professional repair services. We offer fast quotes, one-year warranties on reconditioned motors, and expert guidance to minimize your downtime. Minimize your downtime and get your line back up and ready ASAP by contacting Wake Industrial for a quote via the form on the page or by calling  1-919-443-0207.

Rexroth motors are critical components in countless industrial systems, delivering the reliable motion control needed for manufacturing, automation, and machine tooling. Bosch Rexroth (formerly Indramat) offers a range of motor series known for their performance and durability. In this guide, we focus on four major Rexroth motor series – MHD, MKD, 2AD, and MSK – highlighting their features and how they can keep your operations running smoothly.

MHD Series Rexroth Motors (High-Dynamic AC Servos)

The MHD Series is a family of Rexroth Indramat AC synchronous servo motors designed for high-dynamic motion control. They are typically paired with Rexroth’s digital drive controllers to form cost-effective, feature-rich automation systems. MHD motors use permanent-magnet rotors and integrated digital encoders to achieve precise positioning and speed regulation. This series is engineered as a workhorse main drive solution for machinery such as CNC machine tools, handling systems, printing presses, packaging equipment, and even food processing lines.

• High Dynamic Performance: MHD servomotors offer exceptional acceleration and responsiveness thanks to an optimized torque-to-inertia mass ratio, while also maintaining high operational reliability. This allows for rapid start-stop cycles and precise control of fast-moving axes.
• Maintenance-Free Design: A brushless construction and grease-lubricated bearings (sealed for life) mean that MHD motors deliver virtually maintenance-free operation over their service life. Users benefit from less downtime and lower upkeep costs.
• Flexible Size & Configuration Options: The MHD series spans multiple frame sizes (from smaller MHD041 units up to large MHD115 models), each with various frame length designations. Motors in this series can be ordered with or without holding brakes and with either plain or keyed output shafts to meet different application needs.
• Cooling Variants: MHD motors are available in versions for natural convection cooling (denoted by an "A" housing in the model code) or built-in liquid cooling (denoted by "N" housing) to handle higher thermal loads. An internal temperature monitoring system protects the motor from overload by issuing warnings or shutdowns if limits are exceeded.
• Easy Installation: Many MHD models feature rotatable connectors for power and feedback. For example, on the MHD041, MHD071, and MHD090 sizes, the connectors can rotate up to 240°, simplifying cable routing in tight spaces or moving assemblies. This, combined with standardized cabling options, makes integration and maintenance quicker.

Example Highlight: The high-power density of the MHD series is exemplified by its largest model. An MHD112D-027-NP0-BN servo motor can output approximately 15 kW of power and around 59 Nm of torque at 2000 RPM, with a peak speed of up to 3000 RPM. This level of performance allows a relatively compact motor to drive heavy loads with precision.

MKD Series Rexroth Motors (Versatile Servo Motors)

The MKD Series of Bosch Rexroth Indramat motors are comprised of digital AC servo motors known for their reliability and versatility. When paired with Rexroth’s intelligent drives, MKD motors provide cost-effective automation solutions across a wide range of industries – from machine tools and printing presses to packaging lines and food processing machinery. These motors are designed for precise motion control, operating on the servo principle (receiving commands from a controller to position or rotate a load).

• Reliable, Long-Life Operation: MKD servo motors are built for high operational reliability and long service life. They feature robust construction and quality components that endure demanding conditions with minimal performance degradation. Even under continuous duty or in harsh environments, MKD motors have proven to be dependable workhorses.
• Broad Speed and Torque Range: One standout aspect of the MKD series is its broad performance envelope. These motors exhibit a wide constant torque range across varying speeds, meaning they can deliver strong torque even at higher RPMs. This makes them suitable for both low-speed, high-torque tasks and high-speed applications without sacrificing positioning accuracy.
• Wide Range of Sizes (0.1 kW to 7 kW): MKD motors come in several frame sizes and power ratings to fit different application scales. For instance, the series ranges from the MKD025 (with a flange size ~54 mm) up to the MKD112 (flange ~192 mm). Power output spans from about 0.1 kW in the smallest units up to around 7 kW in the largest. This spectrum covers everything from small robotic actuators to large machine axes.
• Multiple Configurations Available: To further match application needs, MKD motors offer options such as different frame lengths (A, B, C, or D lengths for a given frame size) and winding codes to fine-tune speed/torque characteristics. They can be ordered with or without holding brakes, and with output shafts either smooth (plain) or with keyways. Additionally, connector orientations for power/feedback can vary (some models have connectors that rotate or exit in different directions), which aids in flexible mounting and cable layout.
• Advanced Feedback Systems: Depending on the model, MKD series motors use either a resolver or a high-resolution encoder for feedback. Higher-end MKDs feature resolver feedback with an integrated multiturn absolute encoder, enabling precise multi-turn position tracking. This ensures accurate and repeatable positioning in complex motion tasks.

Example Highlight: A mid-size model like the MKD090B-035-GG0-KN provides an excellent balance of speed and torque for many applications. At a rated speed of several thousand RPM, it can still produce substantial torque, making it suitable for tasks such as indexing tables or robot arm joints. On the higher end, the largest MKD112A-024-GG0-AN can deliver ~7 kW of power, accommodating heavy-duty axes in machine tools or large printing presses.

2AD Series Rexroth Motors (Legacy 3-Phase Induction Motors)

The 2AD Series from Rexroth Indramat represents a line of rugged three-phase AC induction motors (asynchronous motors) that were widely used as main spindle and main drive motors. These motors were commonly found in heavy industrial applications – for example, driving the spindles of CNC machine tools, powering large printing and packaging machines, and other equipment requiring high speed and high power output.

Unlike the servo motors of the MHD/MKD/MSK families, 2AD motors are induction-type and thus rely on an external feedback device for precise speed/position control. They are built for continuous operation and can deliver very high rotational speeds and torque. Standard 2AD motors cover speeds from ~1,500 RPM up to 9,000 RPM depending on the model, allowing them to handle both low-speed, high-torque tasks and high-speed applications like spindles. These motors were offered in two mechanical variants: B05 flange-mount models and B35 flange & foot mount models, providing flexibility to machine builders in how the motor is installed.

One important aspect of the 2AD series is its legacy status. Bosch Rexroth has discontinued manufacturing new 2AD motors – they are now considered legacy products. Many machines built in the 1990s and 2000s still rely on 2AD motors that have been running for decades. The longevity of these motors is a testament to their quality, but when they do fail or wear out, obtaining replacements requires specialized suppliers since you can no longer order them new from the manufacturer.

• High Power & Torque: 2AD motors were produced in various frame sizes (such as 2AD100, 2AD130, 2AD132, etc.), offering different power levels. Larger models can deliver very high torque and power—for example, a 2AD132D-B05LA3-AS03-A3N3 motor is rated for about 140 Nm continuous torque with peaks around 350 Nm, and roughly 22 kW of output power in its top configuration. This makes the 2AD series well-suited for driving heavy loads (like big spindles or extruders) that demand serious muscle.
• Precision Feedback Integration: Although they are induction motors, 2AD units can be equipped with high-resolution encoders (incremental or absolute) for closed-loop control. In practice, Rexroth often paired 2AD motors with Indramat drive controllers and an encoder to form a servo spindle system. This gives the system precise speed and position control over the motor, enabling accurate spindle positioning and speed regulation for machining processes.
• Rugged Construction: The 2AD series was built to withstand harsh industrial conditions. They feature sturdy cast housings and are typically IP54 or higher in protection (with options for IP65 sealing on some versions). The motors can operate in ambient temperatures of 0 °C to +45 °C (with proper cooling) and at installation altitudes up to about 1000 m above sea level without derating. Vibration and shock tolerance are high, as these motors were designed for machine tool environments. Heavy-duty, permanently lubricated bearings (rated for ~20,000 hours) support the rotor and can handle the large radial and axial forces from machining operations.
• Mounting & Cooling Options: Every 2AD motor includes a fan unit for cooling – generally an axial blower mounted on the rear of the motor. The fan runs on standard mains voltage (often 230 V) and forces air over the motor fins. Additionally, users could order various flange/foot mounting configurations (B05 vs B35) to suit their machine’s design. This flexibility in mounting, combined with the choice of cooling arrangements, made it easier to retrofit 2AD motors into older machines or different machine layouts.

Legacy Support: Since new 2AD motors are no longer manufactured, maintaining equipment that uses them depends on quality refurbished units and repairs. Wake Industrial specializes in supporting these legacy motors. We carry a large stock of reconditioned 2AD motors in different models and configurations – each one fully tested and backed by a one-year warranty. In many cases, repairing a faulty 2AD motor can be more cost-effective than replacing it, and our team offers expert remanufacturing and repair services to restore your motor to like-new condition. Contact us via email at sales@wakeindustrial.com to receive a comprehensive, price competitive quote within 15 minutes. 

MSK Series Rexroth Motors (IndraDyn S Synchronous Servos)

The MSK Series (IndraDyn S synchronous servo motors) is Bosch Rexroth’s modern high-performance servo line. MSK servo motors, also known by the IndraDyn S name, are often referred to as the “workhorse” motors in Rexroth’s lineup. They are designed to be used in conjunction with Rexroth’s IndraDrive servo drives, offering a wide continuous power range in fine size increments to precisely match application requirements. With their high torque density and precision, MSK motors can be found in a diverse range of applications – from high-speed automation and robotics to heavy-duty machine axes – and can be configured to suit almost any motion control need.

All MSK motors are synchronous AC servos featuring advanced permanent magnet rotor technology. They come standard with high-resolution feedback devices (typically absolute multi-turn encoders) that provide extremely accurate position and speed information. The entire MSK range is noted for its excellent dynamics, very high precision, and compact design with high torque density. In practical terms, this means an MSK motor can accelerate quickly, hold precise positions, and deliver a lot of torque for its size – enabling machine builders to create faster and more accurate systems without increasing motor footprint.

• Extensive Size Range: The MSK series is available in multiple frame size designations (e.g. MSK030, 040, 050, 070, 100, 101, etc.), each with several length and winding variations. This fine gradation allows engineers to choose a motor that most closely fits their torque and speed requirements, improving efficiency. Whether you need a very small servo motor or a large one, there is likely an MSK model that fits the bill.
• High Torque Density: Rexroth’s design of the MSK motors emphasizes maximum torque output in a minimal form factor. These motors utilize optimized electromagnetic designs and cooling to pack more torque per volume than previous generations. As a result, even a mid-sized MSK motor can often replace a larger older-model motor. For example, an MSK100D-0200-NN-M2-BG0-RSNN motor (a fairly large frame in this series) can provide about 57 Nm of continuous torque and up to 187 Nm of peak torque, while running at speeds up to 3000 RPM. This kind of performance in a relatively compact unit allows it to handle heavy-duty tasks that once required much bulkier motors.
• Precision and Dynamics: All MSK servos come equipped with high-resolution encoder systems (such as Hiperface optical encoders with multi-turn capability) for precise control. They excel at applications requiring tight synchronization or positioning – for instance, coordinating multi-axis robot movements or maintaining register on a printing press. The combination of low inertia, strong torque, and fast update feedback gives MSK motors very fast acceleration and deceleration profiles and sub-micron positioning accuracy in the right system.
• Cooling Options: MSK motors are designed to operate with natural convection cooling (self-cooling via surface radiation and convection) in their base configuration, which simplifies their use. For higher continuous power demands, several MSK models support optional external cooling. Axial fan units can be mounted to smaller MSKs (slim profile motors) and radial fan units to larger ones (shorter, wider motors) to increase airflow over the housing. Additionally, the largest frames (such as MSK101) offer models with liquid cooling jackets, allowing significantly higher continuous torque output by actively removing heat. Users can select the cooling method appropriate for their application’s duty cycle and environmental conditions.

Example Highlight: For a concrete example of the MSK’s capabilities, consider a Bosch Rexroth MSK101E-0200-FN-M1-AG0-NNN servo (one of the largest in the series). With appropriate cooling, this motor can produce well over 100 Nm of continuous torque and handle momentary peaks approaching 300 Nm, all while maintaining positioning accuracy on the order of a few arc-minutes. Such a motor can drive large rotary tables or heavy linear actuators in automation lines with ease, demonstrating the impressive power and control the MSK family provides.

Ready to Get Your Rexroth Motor Running?

No matter if you’re dealing with an older Indramat legacy motor or a current-generation Rexroth servo, Wake Industrial is dedicated to keeping your systems running. We combine an extensive inventory of Rexroth motors, rapid-response repair capabilities, and knowledgeable support to deliver the solutions you need when you need them. Call us toll-free at 1-919-443-0207 or email us at sales@wakeindustrial.com to request a quote, check availability, or arrange for a repair service. Our team is standing by to help you maximize your uptime with quality Rexroth motor replacements and repairs.