MDD025A-N-100-N2K-040PC1

MDD Synchronous Motors

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The MDD025A-N-100-N2K-040PC1 motor from Bosch Rexroth Indramat is part of the MDD Synchronous Motors series. It features standard balancing, a blocking holding brake with 1.0 Nm torque, and an integrated absolute encoder with resolver feedback. The motor has a centering diameter of 40 mm, motor size 025, and a nominal speed of 10000 min⁻¹. Connection is via a side-A connecting cable with coupling unit and the shaft is a keyway type.

Technical Specifications

Balancing
Standard

Holding Brake
With blocking brake

Holding Brake Torque
1.0 Nm

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
With 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

What installation alignment challenges arise from the 40 mm centering diameter and keyway shaft?

The 40 mm centering diameter presumes mating hardware and mounts that match that spindle for concentricity; misalignment can cause vibration or bearing wear. The keyway shaft simplifies torque transmission to couplings or gears but requires the correct key and tolerances per standard (e.g. DIN keyway), and care in mounting to avoid keyway stress concentrations.

What are the electrical and mechanical connection considerations of the “connecting cable with coupling unit, side-A connection”?

The side-A connection implies the cable exits on the designated side (matching drive/mounting layout), so the cable routing and space constraints must consider bend radius, drag chains, etc. The coupling unit needs proper mating connectors and possible shielding if used in electrically noisy environments; connector type and pin-outs must match the drive’s requirements.

What vibration and balancing considerations come with “standard balancing”?

Standard balancing typically means the rotor is balanced sufficiently for most applications but may not meet requirements for ultra-high speed, extremely low vibration, or precision optics/semiconductor handling. For those, “high precision” or “high balancing grade” versions might be needed to reduce runout and micro-vibrations.

How will using the MDD025A-N-100-N2K-040PC1 impact drive compatibility and controller demands?

Because this motor is designed for digital drive controllers and provides resolver + absolute encoder feedback, the drive must support those feedback types, have sufficient current capacity, and be able to handle the thermal and dynamic requirements (peak currents, braking regen, inertia). Controller firmware must also support the encoder protocols, possibly calibration (offset, scaling), and safety features tied to the holding brake.

What are the practical implications of using the 1.0 Nm holding (blocking) brake in this motor?

The 1.0 Nm brake allows the rotor to stay locked under small torques when de-energized, which is useful for safety or position hold, but it adds inertia and requires extra torque from the motor during braking/unbraking cycles. Also the brake consumes power (for example to release) and may produce heat, so thermal load and control wiring need to be planned accordingly.

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Internal Product Review

The MDD025A-N-100-N2K-040PC1 motor by Bosch Rexroth offers resolver feedback, 0.33 Nm continuous torque, and a 10,000 min⁻¹ nominal speed. It includes a 1.0 Nm holding brake, shaft seal, and side-A connection with keyway shaft type. This motor suits precision roles in robotics, medical devices, and semiconductor machinery.