MDD025A-N-100-N2K-040MC0

MDD Synchronous Motors

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The MDD025A-N-100-N2K-040MC0 motor by Bosch Rexroth Indramat is part of the MDD Synchronous Motors series. It features a motor size of 025, a nominal speed of 10000 min⁻¹, continuous torque at standstill of 0.33 Nm, and an integrated absolute encoder. The unit uses resolver feedback and connects via a side A cable with coupling unit to ensure reliable communication. This standard-housed motor, without blocking brake or shaft seal, is designed for digital drive controllers.

Technical Specifications

Balancing
Standard

Holding Brake
Without blocking brake

Centering Diameter
40 mm

Housing
Standard

Encoder
Integrated absolute encoder

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
Connecting cable with coupling unit

Product Type
Motor for digital drive controllers

Shaft End
Standard (without side B shaft end)

Frequently Asked Questions

How does a nominal speed of 10,000 min⁻¹ affect cooling and thermal design for continuous operation?

High rotational speed increases friction in bearings and air resistance (windage), so cooling (via convection or forced air) must dissipate that heat to avoid exceeding insulation class limits or degrading lubricant in bearings. Also, torque drops off at higher RPM due to increased losses, so thermal derating curves are essential to maintain reliability over long duty cycles.

What role does the centering diameter (40 mm) and side-A cable connection play in mounting and integration?

The centering diameter ensures that the motor aligns with mating components concentrically, reducing misalignment-induced vibration and bearing load. A cable connection on Side A with coupling unit influences how routing is done; tight cable bends, length, and connector quality affect signal integrity (especially for encoder/resolver signals) and ease of maintenance.

In what ways will the motor’s standard housing (size “standard”, length code A) constrain or benefit compact system designs?

A standard housing and shorter length (length code A) generally reduce footprint and mass, making it easier in space-limited or lightweight robotic arms or lab automation. However, shorter motors may have lower continuous power capacity or less margin for overloading, so careful matching of torque/speed profile to task is necessary.

What are the practical implications of having both resolver feedback and integrated impulse absolute encoder in terms of signal processing and controller requirements?

The resolver requires analog-to-digital conversion and possibly filtering (resolver-to-digital converters) which add latency and requires compatible drive electronics; the absolute encoder output also must be read correctly and synchronized. The controller must support both feedback channels (or at least accept their outputs) and be tuned for combined feedback to avoid oscillations or position error due to phase shifts.

What are the thermal/mechanical limitations imposed by operating the MDD025A-N-100-N2K-040MC0 motor continuously at or near its standstill torque?

Holding the motor at standstill under load means minimal airflow, so heat generated by copper losses (current draw) accumulates, risking insulation damage or overheating unless the motor housing and installation allow sufficient heat dissipation. Mechanically, constant torque at zero speed stresses bearings and shaft keying, so regular maintenance or design for bearing preload is important.

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Internal Product Review

The MDD025A-N-100-N2K-040MC0 motor by Bosch Rexroth includes resolver feedback, an integrated absolute encoder, and a keyway shaft. It delivers 0.33 Nm continuous torque at standstill with a nominal speed of 10,000 min⁻¹. This motor is suitable for use in robotics, lab automation, and semiconductor machinery.