BrandIndramatBosch Rexroth · Indramat

MDD090 Series · B-length model

MDD090B Indramat Digital AC servo motor

MDD090B is the B-length package within the MDD090 digital ac servo motor range. The model prefix fixes the 090 frame and B motor length, but the winding, cooling, feedback, centering, shaft, connector and brake fields still determine the complete replacement.

The planning manual’s MDD090B-N-020 row documents 7.2 Nm continuous torque at standstill and 8.3 A continuous current at a nominal 2,000 rpm winding. Those values describe that published operating row—not every complete MDD090B part number.

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Product identificationMDD090B

Match the complete nameplate, including every suffix. Ask Litco for current photos of the unit being quoted.

Known exact part-number variations

MDD090B exact part numbers

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MDD090B-N-020-N2L-110GB1

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MDD090B-N-030-N2L-110PA0

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MDD090B overview

MDD090B is the B-length MDD090 servo motor. Baseline dimension A is 340 mm. The complete suffix determines winding, cooling, feedback, shaft and brake choices.

Model-specific technical data

MDD090B-N-020 manual snapshot

Source: MDD project planning manual, Fig. 8.1, page 74. Nominal winding speed is not a universal maximum usable speed. Match the drive, load, cooling arrangement and complete suffix.

Continuous ratings use the manual’s 60 K housing-temperature-rise basis. Published motor mass excludes the holding brake and external cooling hardware.

Model: MDD090B
Motor platform: Digital AC servo motor
Motor length: B designation
Baseline dimension A: 340 mm
Reference winding row: MDD090B-N-020
Reference nominal speed: 2,000 rpm
Continuous torque at standstill: 7.2 Nm natural convection / 10.5 Nm surface cooled
Continuous current at standstill: 8.3 A natural convection / 12.2 A surface cooled
Theoretical maximum torque: 39 Nm · drive dependent
Maximum current: 48.6 A
Rotor inertia: 36 × 10⁻⁴ kg·m²
Thermal time constant: 60 min natural · 45 min surface cooled
Published motor mass: 18 kg
Published nominal speeds: 2,000 rpm · 3,000 rpm · 4,000 rpm
Centering diameter: 110 mm standard · 130 mm optional
Output shaft diameter: 24 mm (k6)
Shaft styles: Plain shaft · Keyed shaft

Dimensions, winding and cooling

Mechanical interface and speed

Shaft, flange, centering and winding choices

Shaft & flange

24 mm (k6) output shaft

Plain shaft and Keyed shaft are documented at series level. Match the flange drawing, shaft seal and hub connection before installation.

Centering diameter

110 mm standard · 130 mm optional

The centering choice is encoded in the complete part number and must match the machine flange or adapter.

Available speeds

2,000 rpm · 3,000 rpm · 4,000 rpm

These are published nominal-speed choices for this model. The winding code and selected drive determine the actual configuration.

Feedback, shaft and brake choices

Configuration choices

Cooling, feedback and holding brake

Cooling

Manage continuous load and machine clearance

Natural convection
Axial surface cooling
Radial surface cooling

External or surface-cooling arrangements can change the installed envelope and are not interchangeable from the model name alone.

Feedback

Keep the drive’s position and speed signal compatible

Digital servo feedback
Digital servo feedback with integrated multiturn absolute encoder

Photograph the feedback connector and every suffix after the core model.

Holding brake

Match the installed holding requirement

Without holding brake
6.5 Nm holding brake
11 Nm holding brake

A blocking or holding brake is not a dynamic service brake. Check the published exclusion notes for the exact motor length.

Full type-code guide

Full part-number decoder

Read the tag from left to right

The decoder identifies what each field controls; it does not generate valid combinations. Use the factory type code and option exclusions as one record.

MDD

Motor for digital drive controllers

090

Motor frame / size

B

Motor-length and torque package

Housing design

Natural-convection or supported surface-cooling housing

Nominal-speed code

2,000 rpm or 3,000 rpm or 4,000 rpm

Balance / side-B fields

Balance class and standard design without a side-B shaft extension

Feedback field

Digital servo feedback or Digital servo feedback with integrated multiturn absolute encoder

Centering field

110 mm standard or 130 mm optional

Shaft / connector / brake

Mechanical interface, connection direction and holding option

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Keep browsing

Other MDD090 motor lengths

A-length · 275 mmMDD090A3.7 Nm reference torque · 12.5 kg B-length · 340 mmMDD090B7.2 Nm reference torque · 18 kg C-length · 405 mmMDD090C10.4 Nm reference torque · 23 kg

← Return to all MDD series and models

Model-level planning-manual referenceFig. 8.1 · page 74

MDD 090 technical and dimensional data, manual pages 74–82. Published choices do not prove present inventory or that every option can be combined. Confirm the complete type code before replacement.

Open Original Manual ↗