MDD021B-N-100-N2K-032MB0

MDD Synchronous Motors

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The MDD021B-N-100-N2K-032MB0 motor from Bosch Rexroth Indramat is part of the MDD Synchronous Motors series. It delivers a continuous torque at standstill of 0.30 Nm, reaches a nominal speed of 10000 min-1, and uses standard balancing. The unit incorporates an integrated absolute encoder with resolver feedback and includes a 32 mm centering diameter. It features a standard housing and operates without a blocking brake.

Technical Specifications

Balancing
Standard

Holding Brake
Without blocking brake

Centering Diameter
32 mm

Housing
Standard

Encoder
Integrated absolute encoder

Motor Feedback
Resolver feedback

Continuous Torque at Standstill
0.30 Nm

Motor Length Code
B

Motor Size
021

Nominal Speed
10000 min⁻¹

Shaft Seal
Without shaft seal

Shaft Type
keyway

Connection Direction
Side B

Connection Type
Connector

Product Type
Motor for digital drive controllers

Shaft End
Standard (without side B shaft end)

Frequently Asked Questions

What are the inertia implications of this motor for high-acceleration applications?

Because the motor has a small centering diameter (32 mm) and keyway shaft, its rotor inertia is relatively low; this allows quicker torque changes and fast acceleration/deceleration cycles. However, system dynamics (gearbox, load) will still dominate unless the attached load is similarly lightweight and rigid.

How does the resolver feedback contribute to reliability compared to pure encoder systems?

Resolver feedback (being analog, brushless, and transformer-based) is much more tolerant of vibration, temperature extremes, and EMI than many optical or magnetic encoders. It ensures continued accurate commutation and positioning even in harsh industrial environments.

How does continuous torque at standstill (0.30 Nm) affect choosing a drive controller?

A drive must be capable of supplying sufficient current (and cooling) to maintain torque with zero rotor speed, meaning that thermal limits at standstill need careful consideration. Underrated current capacity or insufficient cooling may lead to overheating even if nominal speed performance is acceptable.

What are the mounting alignment considerations given the 32 mm centering diameter?

The centering diameter helps ensure precise mechanical alignment, reducing eccentricity and vibration; it must mate with a matching bore or adapter to avoid misalignment. Poor alignment can amplify imbalance, leading to bearing wear, noise, and reduced feedback accuracy.

What are limitations of operating without a blocking brake?

Without a holding or blocking brake, external forces (gravity, load inertia) can move the shaft when power is off, so mechanical locking or external braking may be necessary in safety-critical or vertical axis uses. For robotics or applications that require holding torque at shutdown, you’ll need to incorporate additional braking mechanisms.

Common Misspellings

Internal Product Review

The MDD021B-N-100-N2K-032MB0 motor from Bosch Rexroth delivers 0.30 Nm continuous torque at 10000 rpm with resolver feedback and an integrated absolute encoder. It features a 32 mm centering diameter, keyway shaft, and side B connector, designed without a shaft seal or brake. This motor suits applications in robotics, textile machinery, and semiconductor equipment.