MDD021B-N-100-N2G-032FB0

MDD Synchronous Motors

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The MDD021B-N-100-N2G-032FB0 from Bosch Rexroth Indramat features continuous torque at standstill of 0.30 Nm and motor size 021. Part of the MDD Synchronous Motors series, it runs at a nominal speed of 10000 min⁻¹ and uses resolver feedback. The housing is standard with centering diameter of 32 mm and length code B.

It connects via a Side B connector and is designed without blocking brake and shaft seal. Balancing is standard. The motor is for digital drive controllers.

Technical Specifications

Balancing
Standard

Holding Brake
Without blocking brake

Centering Diameter
32 mm

Housing
Standard

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
Plain shaft

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 implications of a 0.30 Nm continuous torque at standstill for the MDD021B-N-100-N2G-032FB0 by Bosch Rexroth?

It means the motor can hold loads requiring up to ~0.30 Nm without rotating even when stationary, which is useful for positioning or vertical loads. However, torque drops off at higher speeds, so dynamic load requirements must be checked against its torque-speed curve.

For what types of digital drive controllers must one use motors like the MDD021B-N-100-N2G-032FB0 without a blocking brake?

Drives must provide safe logic for axis holding or stopping, since the motor has no built-in brake; applications requiring safety holding (e.g. safety stops, vertical axes) need an external brake or mechanical lock. The drive must also handle dynamic braking and be capable of safe shutdown without relying on brake torque.

What is the effect of the 32 mm centering diameter and length code “B” on integration into mechanical systems?

The 32 mm centering diameter ensures compatibility with coupling hubs or mounting fixtures designed for that standard size, aiding accurate alignment and reducing eccentric loads. Length code B indicates moderate shaft length and housing depth—important for fitting into compact assemblies and managing moment of inertia.

How does the “standard balancing” of this motor affect vibration and lifetime in high-speed operation?

Standard balancing (balance class N for smaller sizes) is sufficient for many applications, but at high speeds (> about nominal), residual imbalance can cause vibration, bearing wear, and noise; if extremely low vibration or high RPM is needed, higher balance classes or special balancing may be needed.

What are the tradeoffs of a plain shaft vs keyway shaft in this motor type for power transmission?

A plain shaft is simpler and less expensive, allowing non-positive shaft couplings (press fits, clamping hubs), but it can slip if torque or load exceeds friction; a keyway shaft provides positive torque transmission but introduces stress concentration and requires alignment for key fits. Which to use depends on load magnitude, shock loads, and installation precision.

Common Misspellings

Internal Product Review

The MDD021B-N-100-N2G-032FB0 motor from Bosch Rexroth features a nominal speed of 10,000 min⁻¹ and delivers 0.30 Nm continuous torque at standstill. It includes resolver feedback, a plain shaft, and a 32 mm centering diameter with connector-side B connection. This motor is commonly used in packaging, semiconductor, and textile automation systems.