R911265283 (MDD090C-N-030-N2M-110PA2)

MDD Synchronous Motors

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The R911265283 (MDD090C-N-030-N2M-110PA2) is a Bosch Rexroth digital AC servomotor intended for use with external drive controllers. It features IP65 protection and employs both natural convection and surface cooling, with the blower rated for a 1 x 115/230 VAC supply. The motor includes a standard housing, a black-coated enclosure, B5 mounting flange with throughholes, and a shaft with a keyway and sealing ring. It is equipped with an integrated multiturn absolute encoder for digital servo feedback and incorporates an 11 Nm holding torque blocking brake. Standard shaft type, centering diameter of 110 mm, motor length code C, size 090, and nominal speed of 3000 min⁻¹ are provided. Power and connecting cables for the blocking brake and temperature sensor are included. The unit saves motor parameters in the drive and is suitable for applications such as grinding machines.

Technical Specifications

Protection Level
IP 65

Cooling Type
Natural convection and surface

Device Type
AC Servomotor

Coating
Black prime

Mounting Method
Flange with throughholes (Design B5)

Shaft Type
Keyway

Brake
Blocking brake with 11Nm holding torque

Sealing Ring
Included in Output Shaft

Motor Shaft Load Direction
Axial or Radial Forces

Surface Cooling Supply Voltage
1 x 115/230 VAC Blower

Bearing Side
B Side

Application
Grinding Machines

Size Code
90

Blocking Brake Time
1 Minute

Output Direction
Fixed for power connection

Feedback
Absolute Indirect Position Detection

Connection
12-pin flanged socket for feedback connection

Destination
Global Shipping Available.

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.

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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.