Description
Bosch Rexroth MKD090B-047-GP0-KN | Servo Motor
Product Introduction
The Bosch Rexroth Indramat MKD090B-047-GP0-KN is an MKD-series digital AC synchronous servo motor intended for closed-loop machine motion applications. The 090 frame, B-length housing, 047 winding, resolver feedback, keyed output shaft, no-brake configuration, Side-B connection box, and natural-convection design define the complete motor configuration.
For replacement engineering, the GP0 configuration is particularly important because the P shaft designation specifies a keyed shaft with shaft sealing ring rather than the plain shaft used by the GG0 configuration. The MKD090B-047 winding is rated at 4.8 kW, 3,500 RPM, 9.9 Nm, 8.4 A, and 351 V, with a documented 59.4 A peak current and 12.0 Nm continuous standstill torque under the standard 60 K natural-cooling condition.
MKD090B-047-GP0-KN
Key Technical Specifications
- Manufacturer: Bosch Rexroth Indramat
- Model: MKD090B-047-GP0-KN
- Material Number: R911263529
- Motor Family: MKD synchronous motor
- Motor Size: 090
- Motor Length: B
- Winding Code: 047
- Feedback: Resolver
- Position Detection: Relative
- Driven Shaft: Keyed shaft with shaft sealing ring
- Key Standard: DIN 6885-1
- Holding Brake: None
- Rated Speed: 3,500 RPM
- Characteristic Motor Speed: 3,200 RPM
- Maximum Speed: 5,000 RPM
- Rated Torque: 9.9 Nm at the 100 K natural-cooling rating point
- Continuous Standstill Torque: 12.0 Nm at 60 K natural cooling
- Theoretical Maximum Torque: 43.5 Nm
- Rated Current: 8.4 A
- Continuous Standstill Current: 13.3 A at 60 K natural cooling
- Peak Current: 59.4 A
- Rated Voltage: 351 V
- Rated Output: 4.8 kW
- Rated Frequency: 233 Hz
- Torque Constant: 1.05 Nm/A at 20°C
- Voltage Constant: 91 V/1,000 RPM at 20°C
- Winding Resistance: 1.2 ohms at 20°C
- Winding Inductance: 10.1 mH
- Pole Pairs: 4
- Rotor Inertia: 43.0 × 10⁻⁴ kg·m²
- Flange Size: 140 mm
- Centering Diameter: 110 mm
- Protection: IP65
- Insulation Class: F
- Cooling: Natural convection
- Connection: Connection box, Side B
- Motor Mass: Approximately 14 kg
- Condition: Legacy / verify condition
Application Scenarios & Pain Points
CNC and Machine-Tool Axis Drives
The MKD090B-047 can serve as a replacement motor where the original machine uses an appropriately matched Rexroth motion-control system.
Engineering issue: A motor that physically mounts correctly can still be electrically incompatible if the resolver interface, motor data, drive parameter set, or winding configuration does not match.
Packaging and Material-Handling Machinery
The 9.9 Nm rated torque and 3,500 RPM rated speed provide a useful combination for rotary positioning, indexing, and coordinated machine axes.
Engineering issue: The absence of a holding brake must be accounted for when an axis can move or back-drive after servo power is removed.
Legacy Rexroth Servo-System Replacement
The exact MKD090B-047-GP0-KN type code is useful when replacing an aging motor without changing the mechanical interface.
Engineering issue: The keyed shaft is not interchangeable from a mechanical perspective with a plain-shaft MKD090B-047-GG0-KN installation without checking the coupling and shaft arrangement.
High-Acceleration Motion
The motor has a documented 59.4 A peak-current rating and 43.5 Nm theoretical maximum torque, making drive-current configuration an important part of commissioning.
Engineering issue: Peak motor current capability does not mean the connected drive can supply that current. Drive sizing and motor parameterization must be checked together.
QA & Live Testing SOP
- Identity Verification
- Confirm the nameplate reads MKD090B-047-GP0-KN.
- Verify material/order number R911263529 where present.
- Record serial number, production information, and visible nameplate markings.
- Mechanical Inspection
- Inspect the 140 mm flange and 110 mm centering diameter.
- Inspect the keyed shaft and keyway for burrs, impact damage, corrosion, or deformation.
- Confirm the shaft seal is intact.
- Rotate the shaft manually and check for abnormal mechanical resistance or bearing noise.
- Feedback Verification
- Confirm resolver feedback hardware is present.
- Inspect resolver wiring and connector/terminal-box condition.
- Perform resolver excitation and feedback checks using compatible Rexroth test equipment or the intended drive system.
- Winding Checks
- Measure phase-to-phase resistance and compare all phases.
- Check insulation resistance with an appropriate test procedure.
- Investigate significant phase imbalance before applying servo power.
- Compare measured characteristics against the documented motor data where practical.
- Controlled Live Test
- Use a compatible Rexroth servo drive and validated motor parameters.
- Start at low speed with controlled current limits.
- Verify correct rotation direction and resolver feedback.
- Monitor phase current, following error, motor temperature, and abnormal vibration.
- Progress toward operating speed only after the low-speed test passes.
- Packaging
- Protect the keyed shaft from impact.
- Use ESD-safe handling for the feedback electronics.
- Prevent moisture and conductive debris from entering the connection box.
- Secure the motor against movement during transport.
Field Engineer’s Pitfall Guide
❗ Do not substitute the shaft configuration casually.
The P in GP0 identifies the keyed shaft configuration with shaft sealing ring. uses a plain shaft. Verify the coupling, keyway, shaft dimensions, and machine drawing before treating these as interchangeable.
❗ GP0 does not mean absolute encoder feedback.
The first character of the GP0 block is G, which identifies resolver feedback. The K designation is used for the resolver configuration with integrated multiturn absolute encoder. Verify the complete feedback architecture before importing parameters from another MKD motor.
❗ No holding brake is included in the 0 position.
The GP0 configuration specifies no holding brake. Do not use this motor as a drop-in replacement for a brake-equipped motor on a vertical axis without an independent load-holding strategy.
❗ Do not size the drive from rated power alone.
The motor’s documented peak current is 59.4 A, while the rated current is 8.4 A. Drive peak-current capability, motor parameters, acceleration profile, and thermal limits must be evaluated together.
❗ Verify the exact winding code.
motors were available with multiple winding codes. A visually similar MKD090 motor is not automatically an electrical substitute for the 047 winding.
Intent-Driven FAQ
Q: What is the exact part number for this motor?
A: The exact type code is MKD090B-047-GP0-KN, with material/order number R911263529.
Q: Wh of es the use?
A: It uses resolver feedback for relative rotor-position detection. It is not the integrated multiturn absolute-encoder version identified by the K feedback designation.
es the have a keyed shaft?
A: Yes. The P shaft designation specifies a shaft with key according to DIN 6885-1 and a shaft sealing ring.
Q: Does this motor include a holding brake?
A: No. The 0 brake designation specifies a motor without a holding brake.
Q: What are the primary rated electrical values?
The winding is documented at 4.8 kW, 3,500 RPM, 9.9 Nm, 8.4 A, 351 V, and 233 Hz at the applicable rated operating point.
Q: What is the continuous standstill torque?
A: The documented continuous standstill torque is 12.0 Nm at 60 K natural cooling. The project-planning data also gives 13.5 Nm at 100 K natural cooling and 15.0 Nm at 60 K surface cooling.
inte with MKD090B-047-GG0-KN?
A: Not mechanically by type code alone. Both use the 047 winding, resolver feedback, no brake, and the same basic frame, but GP0 has a keyed shaft while GG0 has a plain shaft. Coupling and machine-interface requirements must be checked.
Q: What should I verife inlegacy ?
A: Verify the complete type code, material number, resolver configuration, shaft/keyway, brake status, connection-box arrangement, drive compatibility, motor parameters, insulation condition, and mechanical condition before energizing the motor.
