MDD021A-N-100-N2K-032MB0

MDD Synchronous Motors

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The MDD021A-N-100-N2K-032MB0 motor features standard balancing, a holding brake without blocking brake, a 32 mm centering diameter and 0.15 Nm standstill torque. Part of the MDD Synchronous Motors series by Bosch Rexroth Indramat, it has an integrated absolute encoder and a nominal speed of 10000 min-1.

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
0.15 Nm

Motor Length Code
A

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 implications of the MDD021A-N-100-N2K-032MB0’s side-B connector direction for machine cable routing and layout?

Since the power/feedback connector is on side B, cabling must accommodate that orientation—ensuring slack and strain relief are correct. Switching to side A or alternate connector output is often only possible at order-time, so retrofitting is difficult.

How does having resolver feedback plus an integrated absolute encoder improve motion control precision?

The resolver gives high-reliability angle feedback (robust against noise/disturbance), while the absolute encoder ensures known rotor position at startup—reducing homing requirement. This combination allows tighter loop control, especially in applications requiring repeatability and zero-position accuracy.

What thermal limitations should be considered for continuous operation with 0.15 Nm standstill torque?

Low torque at standstill still produces heat in the windings; the motor’s thermal time constant (~15 minutes in similar variants) means that long periods at stall risk overheating without cooling or derating. Allow adequate ventilation or intermittent duty if stall times are long.

What are the trade-offs of having “standard balancing” versus “reduced” balancing in servo motors like this one?

Standard balancing is generally acceptable for moderate speeds but may allow more vibration at very high rpm; reduced balance classes minimize rotor imbalance, which is critical in high-speed or high-precision machines. If your application involves 10,000 min⁻¹ or above under light load, vibration from balancing may impact bearing life or downstream components.

In what way does the motor’s shaft keyway type per DIN 6885 affect coupling choices and torque transmission?

The presence of a keyway per that standard allows rigid coupling methods (such as keyed hubs, pinions, or pulleys) and provides assured torque transmission without slippage. One must ensure correct key size, lubrication (if required), and that backlash or looseness is minimized to avoid wear or torque loss.

Common Misspellings

Internal Product Review

The MDD021A-N-100-N2K-032MB0 motor from Bosch Rexroth offers resolver feedback and an integrated absolute encoder with a side B connector. It runs at a nominal speed of 10,000 min⁻¹ and delivers 0.15 Nm continuous torque. This motor is well-suited for use in semiconductor machines, packaging systems, and printing equipment.