MDD090C-N-030-N2M-110PA2

MDD Synchronous Motors

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The MDD090C-N-030-N2M-110PA2 is a three-phase synchronous servo motor built by Bosch Rexroth Indramat for the MDD Synchronous Motors series. It is intended for use with the company’s digital drive controllers where it converts commanded current into controlled rotary motion. Standard housing dimensions and dynamic balancing allow the unit to integrate directly into packaging, materials-handling, or tooling equipment that requires precise speed regulation and repeatable positioning throughout continuous duty cycles. It employs permanent-magnet excitation and closed-loop feedback to keep torque and velocity within narrow tolerances during rapid load changes.

The motor delivers a continuous standstill torque of 10.4 Nm, providing stable force for static loads without overheating. Its rated mechanical speed reaches 3000 min⁻¹, so the shaft can follow typical 50/60 Hz command frequencies through a 1:1 electronic pole relationship. Power and feedback conductors exit on Side A, permitting cable routing along the drive side of the machine. A single-piece circular Connector handles phase, brake, and encoder wiring, simplifying installation. Precise concentricity is maintained by a centering diameter of 110 mm, which aligns the stator to the mounting flange.

For position acquisition, the integrated multiturn encoder feeds digital servo feedback to the controller, enabling absolute position recovery after power cycling. A blocking brake rated at 11.0 Nm locks the rotor when the drive is disabled, preventing back-driving on vertical or indexing axes. The output shaft follows a keyway profile, giving positive mechanical engagement with couplings or pulleys. Contaminant ingress is limited by a shaft seal that retains lubrication and guards against dust and spray, so the motor can operate reliably in general-purpose factory environments without additional sealing hardware.

Technical Specifications

Balancing
Standard

Centering Diameter
110 mm

Connection Direction
Side A

Connection Type
Connector

Continuous Torque at Standstill
10.4 Nm

Encoder
Integrated multiturn absolute encoder

Holding Brake
With blocking brake

Holding Brake Torque
11.0 Nm

Housing
Standard

Motor feedback
Digital servo feedback (DSF)

Motor Length Code
C

Motor Size
090

Nominal Speed
3000 min⁻¹

Product Type
Motor for digital drive controllers

Shaft End
Standard (without side B shaft end)

Shaft Seal
With shaft seal

Shaft Type
keyway

Frequently Asked Questions

What practical effect does the 11.0 Nm holding (blocking) brake torque have in vertical-axis applications?

The brake ensures that under power-off conditions the rotor is held firmly against reverse motion or gravity, but you need to size for static load plus safety margin, as the brake’s friction wear over time can reduce this holding torque.

In a servo loop, what constraints does the “digital servo feedback (DSF)” impose on controller selection or wiring?

Your controller must support the same DSF interface (protocol, resolution, sampling rate) and you must use shielded twisted-pair or differential wiring to preserve signal integrity over cable length.

What trade-offs should you account for when choosing between natural convection and surface cooling modes?

Natural convection gives quieter operation and less complexity but limits continuous power; surface cooling (via blower or forced airflow) allows higher torque or longer duration under load, but adds auxiliary cost, noise, and wiring.

What should a designer check regarding radial and axial loads given the shaft seal and bearing structure?

The shaft seal suggests there is a labyrinth or lip seal design limiting contamination ingress, so high radial/axial loads should stay within the motor’s bearing load ratings to avoid seal damage and premature bearing failure.

In high-speed operation (toward 3000 rpm), what is a likely limiting factor besides torque—especially over time?

Thermal dissipation and bearing fatigue life become limiting, so ensure adequate cooling, consider derating in warmer ambient, and check the bearing lubrication regime under extended high-rpm operation.

Common Misspellings

Internal Product Review

The MDD090C-N-030-N2M-110PA2 motor from Bosch Rexroth features a keyway shaft, shaft seal, and integrated multiturn absolute encoder. It delivers 10.4 Nm continuous torque at standstill and 11.0 Nm holding brake torque with a nominal speed of 3000 rpm. This motor is used in CNC machines, packaging systems, and robotics.