MDD025A-N-100-N2G-040FC1

MDD Synchronous Motors

Rated 4.9 stars (7 total reviews)

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The MDD025A-N-100-N2G-040FC1 from Bosch Rexroth Indramat’s MDD Synchronous Motors series is a precision digital AC servo motor. It offers 10000 min⁻¹ nominal speed, resolver feedback for commutation and speed control, standard balancing and a plain shaft. It delivers 0.33 Nm continuous torque at standstill, includes a 1.0 Nm blocking brake and features a 40 mm centering diameter. It connects via side A cable with coupling unit and omits a shaft seal for simplified maintenance.

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
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 is the effect of having a holding (blocking) brake of 1.0 Nm on continuous torque when using the Bosch Rexroth MDD025A-N-100-N2G-040FC1 motor?

Having the 1.0 Nm holding brake engaged slightly reduces the net usable continuous torque (because of required power to release the brake and potential mechanical friction), so in high-precision duty cycles the torque margin must account for that. Also, the brake adds inertia and may increase thermal load in repeated braking cycles.

How does resolver feedback influence precision and reliability in motion control applications?

Resolver feedback provides absolute rotor position information with high durability under harsh environmental conditions (temperature, shock, vibration), reducing drift or errors over time. It lacks the high resolution of some optical encoders but offers better robustness and simpler electrical noise immunity.

How does the nominal speed of 10,000 rpm affect thermal design and motor life?

Running at 10,000 rpm increases windage, bearing loads, and losses, so sufficient cooling (air or forced) and high-quality bearings are essential to avoid overheating. Over long periods at near nominal speed, thermal stress can shorten insulation life if cooling or duty cycle is inadequate.

What are practical limits when using the standstill torque of 0.33 Nm continuously?

Standstill (zero speed) continuous torque implies that the motor can hold 0.33 Nm without rotation indefinitely, but this generates heat in winding; sufficient thermal management is needed. Also, engaging hold at zero speed under load stresses mechanical elements (shaft, brake) and may require safety margins.

What mechanical alignment and mounting considerations come with a 40 mm centering diameter and plain shaft?

A 40 mm centering diameter requires precise alignment in the coupling or fixture to avoid radial or angular misalignment, which could lead to vibration or bearing wear. Plain (unkeyed) shafts need either keyed couplings or other torque-transmitting features; torque transmission capacity depends on fit and coupling design.

Common Misspellings

Internal Product Review

The MDD025A-N-100-N2G-040FC1 motor from Bosch Rexroth features a continuous torque of 0.33 Nm and operates at a nominal speed of 10,000 rpm. It includes a 1.0 Nm holding brake, resolver feedback, and a plain shaft with side A cable connection. This motor is ideal for precise motion control in robotics, medical automation, and semiconductor manufacturing.