REXRTOH MDD Digital AC Servo Motor Application Guide

Maximum torque: 1.44-3.94 Nm

Optional braking torque: 1.0 Nm

Support shaft seal options

MDD 041

Continuous torque: 0.64-2.05 Nm

Maximum torque: 3.0-9.01 Nm

Thermal time constant: 25 minutes

MDD 065-115 series

As the model size increases, torque, inertia, and power significantly improve. For example:

MDD 115 can achieve a continuous torque of 28-57 Nm and a maximum torque of 87-177 Nm, suitable for high load scenarios such as spindles.

Most models support surface cooling (axial or radial fans) to cope with extreme loads or high-frequency start stop conditions.

Electrical connections and cable selection

5.1 Power Connection

Integration of motor power interface:

Three phase power cord

Temperature Sensor Cable (PTC)

Brake control line (if optional)

The connector supports crimping or welding, and the cable cross-sectional area is selected based on the motor current (starting from 0.75 mm ²). It is recommended to use Indramat matching cables (such as INK 253, INK 650, etc.) to ensure shielding and protection performance.

5.2 Feedback Connection

Adopting a 12 pin flange socket, supporting straight or curved connectors. The feedback cable (INK 209) has oil resistance, hydrolysis resistance, and halogen-free properties, with a maximum length of 75 meters.

5.3 Brakes

Most models can be equipped with a closed-loop brake system, which magnetically locks the shaft when power is off and releases it when powered on (24V DC). The brake is intelligently controlled by the driver and supports parameterized setting of clamping timing (immediate, below 10 rpm, delayed by 400 ms).

Installation, Storage, and Maintenance Guide

6.1 Installation precautions

Avoid prolonged accumulation of liquid at the output shaft end;

Shaft seals are only suitable for water spray prevention situations;

The motor can be installed in any direction, but attention should be paid to the influence of thermal deformation on the position of the A-side shaft end (up to a maximum of 0.6 mm);

The power and feedback connectors must be securely fastened, and the motor must be grounded.

6.2 Storage and Transportation

Storage temperature: -25 ° C to+85 ° C

Avoid vibration, moisture, and dust;

Both the output shaft and the joint have protective covers, do not remove them before installation;

Large motors (such as MDD 112/115) can be transported using lifting screws (M8).

6.3 Maintenance and Service

The motor is basically maintenance free (brushless design, lifetime lubricated bearings). If the brake is stored for more than two years, it needs to be operated by "re sitting" (repeatedly turning on and off the brake after low-speed operation). When there is a malfunction, you can contact technical support through the Indramat service hotline and provide the motor model, drive information, and fault code.

Selection suggestions and application summary

The MDD series servo motors have become the preferred choice for key components in industrial automation due to their high dynamics, high precision, and high reliability. When selecting, key considerations should be given to:

Torque and speed requirements: combined with S1/S2 curve and load cycle;

Environmental adaptability: protection level, cooling method;

Feedback accuracy: Choose either Resolver or DSF according to motion control requirements;

Installation space: flange type, outlet direction;

System compatibility: Compatibility with Indramat drive controllers.

This series of motors is not only suitable for traditional machine tools and robots, but also plays an important role in emerging fields such as semiconductors, laser processing, and precision inspection, providing core power support for the intelligence and efficiency of high-end equipment.