MDD025A-N-100-N2G-040FR1

MDD Synchronous Motors

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1-888-551-3082

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The MDD025A-N-100-N2G-040FR1 is a size 025 motor with a centering diameter of 40 mm. Manufactured by Bosch Rexroth Indramat in the MDD Synchronous Motors line, it features resolver feedback and 0.33 Nm continuous torque. It has a blocking brake providing 1.0 Nm torque and a plain shaft with right-hand connector.

Technical Specifications

Balancing
Standard

Holding Brake
With blocking brake

Holding Brake Torque
1.0 Nm

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
Plain shaft

Connection Direction
Right

Connection Type
Connector

Product Type
Motor for digital drive controllers

Shaft End
Standard (without side B shaft end)

Frequently Asked Questions

How does the 0.33 Nm continuous torque at standstill impact heat dissipation and motor cooling in sustained duty applications?

Holding high torque at zero speed causes current to flow continuously without cooling from rotation, so thermal rise depends heavily on ambient temperature and heat sinking—mounting the motor on a well-conductive frame and possibly forced convection becomes necessary. If thermal limits are exceeded, insulation life and magnet integrity may degrade.

How does the 40 mm centering (flange) diameter affect mounting alignment precision and mechanical coupling?

A precise centering diameter helps ensure coaxial alignment with gearboxes, shafts or couplings, reducing misalignment-induced loads on bearings and prolonging life. It also simplifies the design of mounting plates or adapters because standard 40-mm centering tooling can be used.

In a robotics application, how does the plain shaft (without keyway) vs. keyway or keyed shaft impact torque transmission and shaft coupling?

A plain shaft means that torque must be transmitted via shrink fit, clamp coupling, or other frictional coupling rather than relying on a key, which avoids stress concentrations but requires precise coupling design (surface finish, fit tolerance). Mismatched coupling slip or tolerances can lead to backlash or slippage under peak torque.

How does sizing (frame size-025, length code A) influence the motor’s inertia and acceleration capability in high dynamic applications?

Smaller frame and shorter length reduce rotor mass and rotational inertia, enabling quicker acceleration and deceleration. However, the trade-off is limited torque and mechanical robustness, so for heavier load inertia the drive must be sized accordingly to avoid overshoot or sluggish motion.

What applications are best suited for the Bosch Rexroth MDD025A-N-100-N2G-040FR1 motor, and which conditions may limit its use?

Its compact size, high speed, and resolver feedback make it ideal for robotics, semiconductor tools, and packaging machines where precision and dynamic response matter. Limitations include environments with high ambient temperature without cooling, very high shock/vibration (if not properly mounted), or requirements for IP-rated protection (since it lacks a shaft seal in original spec).

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Internal Product Review

The MDD025A-N-100-N2G-040FR1 motor from Bosch Rexroth delivers a nominal speed of 10,000 min⁻¹ and a continuous torque of 0.33 Nm. It includes resolver feedback, a plain shaft, and a blocking brake with 1.0 Nm holding torque. This motor is well-suited for applications in robotics, semiconductor machinery, and textile automation.