Reliable New Synchronous Servo Motor Rexroth R911315851 MSK071E-0200-NN-M1-UG1-NNNN Designed For Industrial Machines

The REXROTH R911315851 MSK071E-0200-NN-M1-UG1-NNNN is a precision synchronous servo motor from the Rexroth IndraDyn S MSK motor series. It is designed for industrial machines that require controlled torque, accurate shaft position feedback, stable speed regulation, and reliable axis performance in continuous production environments. This motor is part of the MSK071E frame family and uses the 0200 winding configuration, natural convection cooling, multiturn absolute encoder feedback, a smooth shaft, and an integrated electrically released holding brake.

The complete identification of this product is R911315851 MSK071E-0200-NN-M1-UG1-NNNN. The material number R911315851 is used for purchasing, inventory management, spare part matching, and replacement verification. The type code MSK071E-0200-NN-M1-UG1-NNNN describes the motor’s technical configuration. In Rexroth MSK motors, the full type code should always be checked because similar motors may differ in encoder interface, brake option, shaft design, connection position, winding, or mechanical accuracy version.

The approximate reference weight for this servo motor is 25.1 kg. This weight is suitable for product page description, logistics estimation, and spare part handling reference. Actual shipping weight may be higher depending on the packaging method, such as carton packaging, foam protection, wooden case, moisture barrier, or palletized export packing.

Product Specification Table

The REXROTH R911315851 motor is suitable for applications where the motor must provide controlled acceleration, accurate stopping, and repeatable movement across many operating cycles. It can be used in packaging machines, handling systems, indexing equipment, forming machines, printing machinery, feed axes, machine tool auxiliary axes, automated assembly systems, and production lines requiring synchronized servo movement. The motor is not intended to work as a simple standalone AC motor. It is designed to operate with a servo drive that continuously reads the encoder feedback and controls the motor current in a closed-loop system.

A major feature of this model is the M1 multiturn absolute encoder. The encoder provides position feedback to the drive and controller, allowing the machine to monitor the shaft position accurately. Because it is a multiturn absolute encoder, it can retain position information across multiple shaft revolutions. This is valuable for machines where homing time should be reduced or where the axis position must be known after restart. For automated equipment, this can improve startup efficiency, reduce manual adjustment, and support more consistent production performance.

The Hiperface feedback interface is widely used in servo motion systems. It supports reliable communication between the encoder and the drive, allowing the system to recognize position information and motor data. In practical machine operation, encoder compatibility is critical. If a replacement motor has a different encoder type, the existing drive may not recognize it correctly, or the motor may require different parameter settings. Therefore, when replacing this unit, the M1 encoder code should be confirmed against the installed drive system.

The UG1 configuration is another important part of this model code. It indicates a smooth shaft with an integrated electrically released holding brake. The holding brake is rated at 23 Nm and is mainly used to hold the axis when the motor is not energized. This is useful in vertical axes, lifting mechanisms, clamping axes, and machines where the load should not move after the drive is disabled. The brake should not be treated as a normal dynamic stopping brake for repeated high-speed braking. Its correct function is to hold position after the motion has stopped or when power is removed according to the machine design.

The 0200 winding gives the motor a torque and speed characteristic suitable for many industrial servo applications. Compared with faster winding variants, the 0200 winding is often selected where the machine requires strong torque availability and controlled motion rather than only maximum speed. With a referenced standstill torque of 28.0 Nm at 100 K and maximum torque of 84.0 Nm, the motor can support demanding movement profiles when paired with a correctly sized drive. Actual performance depends on drive rating, DC bus voltage, operating temperature, duty cycle, cable length, mounting condition, and mechanical load inertia.

The NN cooling designation means the motor is designed for natural convection cooling. It dissipates heat through its housing and the surrounding mounting structure without requiring an external fan or liquid cooling unit. This simplifies installation and reduces auxiliary components. However, natural convection does not mean thermal limits can be ignored. For continuous-duty operation or frequent acceleration cycles, the machine builder should check the thermal load, ambient temperature, and mounting surface. Correct thermal sizing helps reduce overheating risks and improves long-term reliability.

From a mechanical integration perspective, the motor should be handled carefully because of its approximate 25.1 kg weight. During installation, lifting support should be used when necessary to avoid damaging the shaft, flange, connector, or encoder housing. The smooth shaft should be aligned correctly with the coupling, gearbox, pulley, or driven mechanism. Poor alignment can increase bearing load, create vibration, reduce service life, and cause positioning instability. The connector area should also be protected from impact and contamination during maintenance or shipping.

For procurement and replacement work, the safest product name is REXROTH R911315851 MSK071E-0200-NN-M1-UG1-NNNN Synchronous Servo Motor. This format includes both the material number and the full model code, which reduces the risk of confusion with other MSK071E motors. A partial description such as “MSK071E motor” is not sufficient for accurate ordering because the MSK071E family includes multiple winding, encoder, brake, shaft, and connector variants.

The REXROTH R911315851 MSK071E-0200-NN-M1-UG1-NNNN is a practical servo motor for industrial users who need accurate closed-loop motion control, reliable feedback, and brake-assisted holding capability. Its MSK071E frame, 0200 winding, multiturn Hiperface encoder, natural convection design, smooth shaft, and 23 Nm holding brake make it suitable for many controlled automation axes. Before purchase or installation, users should confirm the full type code, drive compatibility, cable configuration, mechanical mounting size, brake requirement, and load profile to ensure correct system operation.