MDD025A-N-100-N2G-040MA0

MDD Synchronous Motors

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The MDD025A-N-100-N2G-040MA0 digital AC servo motor from Bosch Rexroth Indramat is part of the MDD Synchronous Motors series. It offers a nominal speed of 10000 min⁻¹, continuous torque at standstill of 0.33 Nm, and features a resolver feedback system. This motor has a centering diameter of 40 mm and uses a keyway shaft per DIN 6885 for secure drive connection. With a motor length code A and side A connector, it comes without a blocking brake or shaft seal.

Technical Specifications

Balancing
Standard

Holding Brake
Without blocking brake

Centering Diameter
40 mm

Housing
Standard

Motor Feedback
Resolver feedback

Continuous Torque at Standstill
0.33 Nm

Motor Length Code
A

Motor Size
025

Nominal Speed
10000 min⁻¹

Shaft Seal
Without shaft seal

Shaft Type
keyway

Connection Direction
Side A

Connection Type
Connector

Product Type
Motor for digital drive controllers

Shaft End
Standard (without side B shaft end)

Frequently Asked Questions

What are the vibration or balancing implications of using a motor with “Standard balancing”?

Standard balancing reduces mechanical vibrations under moderate radial and torsional loads but may still allow small residual unbalances. In high-precision or high‐speed systems (10,000 min⁻¹ here), additional dynamic balancing after installation may be needed to avoid resonances or bearing fatigue.

How does the lack of a blocking (holding) brake affect safety and positioning when the motor is de-energized?

Without a holding brake, the rotor is free to move under external loads or gravity when power is off, so safety measures or external brakes are required to secure position. In robotics or vertical axes, mechanical locking or fail-safe brakes are essential for reliable stopping.

What does resolver feedback provide compared to incremental encoders in this type of motor?

Resolver feedback is inherently robust to electrical noise, high temperature, and mechanical shock, offering continuous absolute angle information, which aids commutation control and reduces drift. However, it usually has lower resolution and slower response compared to high-precision optical encoders, which can affect performance in ultra‐fine positioning.

What considerations are there for mounting a motor with a 40 mm centering diameter and keyway shaft?

The 40 mm centering diameter ensures alignment with matching flanges or hubs; a keyway shaft implies torque transmission via key, but stress concentrations at the keyway must be accounted for (e.g. fatigue), and shear resistance of key material and fit are important. Also, misalignment in coupling or load on bearings must be minimized to avoid premature wear, especially since the motor has side-A connection and standard housing.

How does the specification “without shaft seal” influence application and maintenance?

Absence of a shaft seal means the rotating shaft end is not protected from ingress of dust, coolant, or lubricants; in contaminated or wet environments this could degrade bearings and resolver feedback over time. Maintenance schedules must include inspections and possibly add external sealing or protective boots to prolong life.

Common Misspellings

Internal Product Review

The MDD025A-N-100-N2G-040MA0 motor from Bosch Rexroth AG offers 0.33 Nm continuous torque at standstill and operates at a nominal speed of 10,000 min⁻¹. It includes resolver feedback, a 40 mm centering diameter, and a keyway shaft without a holding brake. This motor suits digital drive systems in robotics, CNC machines, and semiconductor equipment.