MDD090A-N-030-N2L-110GA2

MDD Synchronous Motors

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The MDD090A-N-030-N2L-110GA2 motor by Bosch Rexroth Indramat belongs to the MDD Synchronous Motors series. It delivers a continuous torque at standstill of 3.7 Nm, features a holding brake with 11.0 Nm torque, uses digital servo feedback (DSF), and runs at a nominal speed of 3000 min⁻¹. The motor comes in a standard housing with a centering diameter of 110 mm and includes a shaft seal. It connects via a side A connector interface.

Technical Specifications

Balancing
Standard

Holding Brake
With blocking brake

Holding Brake Torque
11.0 Nm

Centering Diameter
110 mm

Housing
Standard

Motor Feedback
Digital servo feedback (DSF)

Continuous Torque at Standstill
3.7 Nm

Motor Length Code
A

Motor Size
090

Nominal Speed
3000 min⁻¹

Shaft Seal
With shaft seal

Shaft Type
Plain shaft

Connection Direction
Side A

Connection Type
Connector

Product Type
Motor for digital drive controllers

Shaft End
Standard (without side B shaft end)

Frequently Asked Questions

Given the continuous standstill torque of 3.7 Nm, what size of load can this motor hold without moving at zero speed?

A torque of 3.7 Nm means it can support a resisting torque up to that amount without motion; for example, for a shaft radius of 50 mm that equates to a force of ~74 N. If the load produces more torque (due to gravity, inertia, friction), movement or slippage may occur, so matching mechanical reduction or gearing is necessary.

What are the thermal considerations for operation at 3000 min⁻¹ for this motor?

Running at 3000 rpm increases heat generation from winding losses, hysteresis, and friction; continuous duty requires adequate cooling (convection, environment temp, mounting). Mounting rigidly with heat-sink surfaces and allowing airflow (or forced cooling) lengthens life and prevents thermal derating.

What effect does having a sealed plain shaft have on reliability and maintenance?

The shaft seal helps prevent ingress of dust, moisture, or lubricants into bearing/shaft interface, improving life in adverse or dirty environments; but a “plain shaft” with seal doesn’t provide a keyway for torque transmission, so coupling or pulley mounting must consider torque capacity without slip. Also, seals add drag and slight extra torque losses at higher speeds.

For B2B installations such as automated assembly lines, what wiring or connector considerations are needed for the side A connector interface?

Side A connector means connection protrudes on a given side, so panel layout, space, and cable routing must avoid interference; using proper connector types rated for environment (vibration, IP class) helps prevent failures. Also, ensure that the cable bending radius, shielding, and length do not degrade the DSF feedback signals.

What precautions are necessary to avoid overloading the holding brake in this motor, particularly during emergency stops or power loss?

If the holding brake alone must arrest a moving load, the dynamic torque during deceleration could exceed its 11 Nm rating, risking mechanical damage or slipping. Therefore, the motor/drive system should incorporate torque limiting, ramping deceleration, and ideally a safety brake or mechanical stop in addition to the holding brake.

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Internal Product Review

The MDD090A-N-030-N2L-110GA2 motor from Bosch Rexroth comes with an 11.0 Nm holding brake, sealed plain shaft, and digital servo feedback. It provides 3.7 Nm continuous torque at 3000 RPM. This motor is suitable for use in robotics, printing systems, and automated assembly lines.