MDD090C-N-030-N2L-110PB2

MDD Synchronous Motors

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The MDD090C-N-030-N2L-110PB2 motor from Bosch Rexroth Indramat is part of the MDD Synchronous Motors series. It delivers a continuous torque at standstill of 10.4 Nm, features a holding brake with 11.0 Nm torque, and a centering diameter of 110 mm. The keyway shaft includes a shaft seal and digital servo feedback (DSF) for precise control. It connects via a side B connector suitable for digital drive controllers.

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
10.4 Nm

Motor Length Code
C

Motor Size
090

Nominal Speed
3000 min⁻¹

Shaft Seal
With 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

How does the "holding brake with 11.0 Nm" impact emergency stops and safety circuits?

When fitted, the 11.0 Nm holding brake securely locks the shaft under power-off or deceleration, allowing safe stops and preventing drift; for emergency stops it needs sufficient braking force margin above load torque. However, brakes add inertia and require energy to release, so control logic and brake drive circuits must accommodate this.

How critical is the centering diameter (110 mm) for mechanical integration?

The 110 mm centering diameter determines alignment precision with mating components (flanges, gearboxes, bearings); mismatches here can cause misalignment, vibration, and early bearing or coupling failure. Proper mounting surfaces and tolerances are needed to exploit motor precision and maintain long life.

What are the implications of using a keyway shaft with shaft seal in terms of torque transmission and maintenance?

The keyway allows positive torque transfer without slippage under heavy loads, but it can introduce stress concentrations that require careful design of key size, fit, and lubrication. The shaft seal protects against ingress of contaminants, which is important for maintaining bearing and seal life especially in harsh or dirty environments.

How does nominal speed (3000 min⁻¹) relate to usable speed range and torque fall-off?

Nominal speed defines the speed at which rated load can continuously be used; beyond that, torque typically falls off because of limitations in heat dissipation and back EMF. In applications needing higher speed, derating or cooling enhancements are necessary; for frequent changes in speed the inertia and drive capability also matter.

Why are factors like winding resistance, inductance, and current limits important for dynamic performance?

Winding resistance impacts I²R losses and heating, inductance affects how fast current (thus torque) can change (affecting acceleration and response), and current limits govern both peak torque and protection against overcurrent. For high acceleration or load change applications, low inductance and robust current provisioning (drive capable) are essential.

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Internal Product Review

The MDD090C-N-030-N2L-110PB2 motor from Bosch Rexroth is designed for use in CNC machines, robotics, and packaging equipment. It features a continuous torque of 10.4 Nm, a nominal speed of 3000 min⁻¹, and an 11.0 Nm holding brake. The motor includes digital servo feedback and a keyway shaft.