Description
Bosch Rexroth MDD065D-N-040-N2L-095PB1 | Servo Motor
Product Introduction
The Bosch Rexroth MDD065D-N-040-N2L-095PB1 is an MDD-series digital AC servo motor built for closed-loop industrial motion systems. The MDD family is associated with Rexroth/Indramat digital drive systems, including DDS and DKS drive platforms. This specific motor uses digital servo feedback, a 95 mm centering diameter, a keyed shaft, and a side-B connector arrangement.
The electrical and mechanical identification matters here. This version is rated at 4,000 RPM with 2.7 Nm continuous standstill torque and 6.3 A nominal current, while its integrated holding brake uses 24 VDC. The final suffix is not cosmetic: PB1 identifies a particular motor configuration, so substituting another MDD065D variant simply because the motor size and speed appear similar can create mechanical, feedback, or brake-interface problems.
MDD065D-N-040-N2L-095PB1
Key Technical Specifications
- Manufacturer: Bosch Rexroth / Indramat
- Series: MDD Digital AC Servo Motors
- Full Model: MDD065D-N-040-N2L-095PB1
- Rexroth Order Number: R911256302
- Motor Size: 065
- Motor Length: D
- Nominal Speed: 4,000 RPM
- Continuous Torque at Standstill: 2.7 Nm
- Nominal Current: 6.3 A
- Feedback: Digital servo feedback / DSF
- Centering Diameter: 95 mm
- Output Shaft: Keyway with shaft seal
- Power Connection: Connector, side-B orientation
- Housing: Standard housing for natural-convection cooling
- Holding Brake: Integrated brake; 24 VDC brake supply
- Product Class: Motor for digital drive controllers
The 4,000 RPM, 2.7 Nm, 6.3 A, digital-feedback, 95 mm mounting-center and brake information is supported by current industrial catalog records for this exact order number/model combination.
Application Scenarios & Pain Points
Legacy Indramat Motion System Replacement
When an older DDS/DKS-based machine loses a motor, the problem is rarely just finding something with the same horsepower. Feedback type, brake configuration, shaft geometry, mounting dimensions, and motor winding code all have to line up.
The MDD065D-N-040-N2L-095PB1 provides an exact model-level replacement target rather than a generic “65-size servo motor.”
Machine Tool and Precision Motion
The MDD family was designed for digital servo-drive applications where commanded position, velocity, and torque are handled through a closed-loop control architecture.
A 4,000 RPM nominal speed makes this configuration relevant to machinery requiring relatively high rotational speed without moving into a larger motor frame.
Packaging and Material-Handling Equipment
Legacy packaging machinery often remains productive long after its original automation platform has been discontinued. A failed servo motor can therefore create a disproportionate downtime problem when the OEM replacement channel is no longer practical.
For procurement, matching the complete model string is safer than sourcing by “MDD065D” alone.
Retrofit and Obsolescence Projects
The MDD series remains relevant to brownfield service work because many installed machines still use older Rexroth/Indramat digital motion architectures.
Before ordering, compare the machine’s existing motor nameplate against MDD065D-N-040-N2L-095PB1 / R911256302, not merely against the MDD family designation.
QA & Live Testing SOP
1. Identity Verification
Record the motor nameplate before energization.
Verify:
- MDD065D-N-040-N2L-095PB1
- R911256302
- Motor size and length
- Feedback designation
- Brake configuration
- Connector orientation
- Shaft and mounting condition
The exact order number is independently cataloged as R911256302.
2. Mechanical Inspection
Inspect the shaft, keyway, shaft seal, mounting flange, centering surface, connector, and brake assembly.
Check for:
- Shaft impact or bending
- Damaged keyway
- Bearing noise or roughness
- Oil contamination
- Cracked connector components
- Damaged mounting threads
- Corrosion around the housing
3. Controlled Electrical Test
Use the correct compatible Rexroth digital servo drive and approved motor cable configuration.
Do not connect an unknown MDD motor directly to an arbitrary AC drive simply because the voltage or connector appears compatible.
4. Feedback Verification
Power the motor through a controlled test setup and verify that the drive recognizes the digital servo feedback.
Confirm:
- Feedback initialization
- Motor identification
- Position feedback response
- Drive diagnostic status
- Direction response
- Speed-command response
A valid communication handshake between motor feedback and drive electronics is more meaningful than a simple unloaded rotation test.
5. Brake Test
Verify the 24 VDC holding-brake circuit independently according to the applicable drive/machine procedure.
Confirm that the brake releases correctly when commanded and engages when the drive removes the release condition.
6. Dynamic Test
Run at controlled low speed first, then increase toward the rated operating range as permitted by the test equipment.
Monitor:
- Abnormal vibration
- Bearing noise
- Current behavior
- Feedback stability
- Brake release
- Acceleration/deceleration response
- Drive faults
Package the motor with shaft protection, connector protection, anti-static handling where appropriate, and mechanical cushioning. Do not allow the shaft or feedback connector to carry packaging loads.
Field Engineer’s Pitfall Guide
❗ Do not substitute by motor size alone.
variants exist with different feedback, winding, brake, and shaft configurations. The difference between PB0 and PB1, for example, should be treated as a configuration difference until verified against the machine documentation. The exact model should be matched character-for-character.
❗ Do not assume the 4,000 RPM rating makes every -N-040 interchangeable.
The family contains multiple suffix variants, including different brake and feedback-related configurations.
❗ Verify the brake circuit before commissioning.
This motor’s configuration includes a 24 VDC holding brake. A motor that physically mounts correctly can still be wrong for the machine if the brake wiring, drive configuration, or control sequence does not match.
Intent-Driven FAQ
Q1. What is the ?
It is a Bosch Rexroth/Indramat MDD-series digital AC servo motor for closed-loop industrial motion-control systems.
Q2. What is the Rexroth order number?
The corresponding order number is R911256302.
Q3. What is the rated speed?
The documented nominal speed is 4,000 RPM.
Q4. What is the continuous standstill torque?
The documented nominal continuous standstill torque is 2.7 Nm.
Q5. Does this motor have digital feedback?
Yes. The is identified with digital servo feedback.
Q6. Does it have a holding brake?
Yes. This PB1 configuration is listed with a holding/blocking brake, and the electrical specification reported for the exact order number identifies a 24 VDC brake.
Q7. Can I replace another motor with this one?
Not automatically. Confirm the complete model string, drive family, feedback system, shaft arrangement, mounting dimensions, brake configuration, and machine parameters before installation. variants exist with different suffix configurations.
Procurement Note
For an obsolete-motion replacement, the safest purchasing reference is the cation: , together with R911256302. Do not approve a substitute from “” alone.
