R911250115 (MDD090C-N-030-N2L-110PB2)

MDD Synchronous Motors

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3 Minutes 43 Seconds

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The R911250115 (MDD090C-N-030-N2L-110PB2) is a digital AC servomotor designed for use with digital drive controllers, featuring digital servo feedback (DSF) and integrated data storage for operational parameters. The unit is finished with a black RAL 9005 coating and includes a blocking brake providing 11.0 Nm holding torque. It features fixed and floating bearings for accommodating radial and axial loads, electronic commutation, and a centering diameter of 110 mm. The motor operates at a nominal speed of 3000 min⁻¹, achieves 10.4 Nm continuous torque at standstill, and is equipped with a shaft seal and keyway type shaft. Connection is via side B using a connector. The motor is constructed to resist environmental effects such as chalky buildup and weathering, is to be installed by qualified personnel, and should be stored in a shock-free, dust-free environment within a temperature range of -25°C to 85°C. Operational frequency for both longitudinal and lateral axes ranges from 2 Hz to 9 Hz.

Technical Specifications

Feedback Type
Digital Servo feedback

Winding Inductance
2.6mH

Housing color
RAL 9005 black prime coat

Brake type
Electrically actuated release

Bearing type
Fixed and floating bearings

Protection type
Against penetration by extrinsic objects

Housing coating resistance
Chalky buildups, weathering and yellowing

Mounting Flange type
With threads

Frequency range
2Hz to 9Hz

Maximum permissible axial force
Less than the maximum permissible radial force

Storage condition
Dry environment free of dust and shock

Storage temperature
-25°C to 85°C

Shipping method
Well-known logistics partners

Angle feedback connector
Directed towards the B side

Installation requirement
Trained or authorized person.

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.

Common Misspellings

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.