MKD090B-047-GG0-KN | 5000 RPM Servo Motor

Description

MKD090B-047-GG0-KN | 5000 RPM Servo Motor

 

Product Introduction

The Bosch Rexroth Indramat MKD090B-047-GG0-KN is a 090B-frame permanent-magnet synchronous servo motor from the MKD family. The 047 winding is paired with resolver feedback, a plain shaft, and no integrated holding brake. This configuration is intended for closed-loop servo applications using compatible Rexroth Indramat drive electronics.

The motor’s natural-convection rating provides 12.0 Nm continuous standstill torque, 6.2 Nm rated torque, and 2.7 kW rated power at 3,500 RPM. The published MKD technical data specifies a 3,200 RPM characteristic speed and 5,000 RPM maximum speed, with a 140 mm mounting flange and 110 mm centering diameter. Cooling method and motor winding temperature directly affect the usable continuous torque envelope.

Key Technical Specifications

• Manufacturer: Bosch Rexroth Indramat
• Model: MKD090B-047-GG0-KN
• Material/Order Number: R911263066
• Series: MKD Synchronous Motors
• Motor Size: 090
• Motor Length: B
• Winding Code: 047
• Product Type: Permanent-magnet synchronous AC servo motor
• Characteristic Motor Speed: 3,200 RPM
• Continuous Standstill Torque: 12.0 Nm at 60 K natural cooling
• Continuous Standstill Current: 13.3 A at 60 K natural cooling
• Continuous Standstill Torque: 13.5 Nm at 100 K natural cooling
• Peak Current: 59.4 A
• Torque Constant at 20°C: 1.05 Nm/A
• Voltage Constant at 20°C: 91 V/1,000 RPM
• Winding Resistance at 20°C: 1.2 ohms
• Winding Inductance: 10.1 mH
• Pole Pairs: 4
• Rated Speed: 3,500 RPM
• Rated Torque: 6.2 Nm at natural cooling / 9.9 Nm at 100 K natural cooling
• Rated Current: 4.8 A at natural cooling / 8.4 A at 100 K natural cooling
• Rated Power: 2.7 kW at natural cooling / 4.8 kW at 100 K natural cooling
• Rated Voltage: 332 V at natural cooling / 351 V at 100 K natural cooling
• Rated Frequency: 233 Hz
• Theoretical Maximum Torque: 43.5 Nm
• Maximum Speed: 5,000 RPM
• Rotor Inertia: 43.0 × 10⁻⁴ kg·m²
• Feedback: Resolver
• Shaft: Plain shaft with shaft sealing ring
• Holding Brake: None
• Connection: Connection/terminal box
• Flange: 140 mm
• Centering Diameter: 110 mm
• Protection Rating: IP65
• Insulation Class: F
• Permissible Ambient Temperature: 0°C to +40°C
• Storage/Transport Temperature: -20°C to +80°C
• Maximum Installation Height: 1,000 m above sea level
• Motor Mass: Approximately 14.0 kg
• Cooling: Natural convection in the standard data set

 

Application Scenarios & Pain Points

1. Legacy Indramat Servo-Axis Replacement

The MKD090B-047-GG0-KN is suitable for replacement applications where the installed machine requires the same 090B frame, 047 winding, resolver feedback, plain shaft, and no-brake configuration.

Pain point: A replacement selected only by MKD090 frame size can have a different winding or feedback arrangement.

2. Machine-Tool Servo Axes

The 3,500 RPM rated speed and 6.2 Nm natural-cooling rated torque make this configuration applicable to machine-tool and positioning systems using compatible Indramat controls.

Pain point: The 047 winding parameters must match the drive configuration. Substituting another MKD090 winding can change voltage, current, torque, and speed behavior.

3. Printing and Paper Machinery

MKD motors were designed for applications including printing and paper machinery, where coordinated servo motion and repeatable speed control are required.

Pain point: Continuous torque depends on cooling and thermal operating conditions. A surface-cooled rating should not automatically be applied to a naturally cooled installation.

4. Packaging and Automated Handling

The MKD090 platform is documented for packaging, handling, and automation applications.

Pain point: The plain shaft requires a compatible coupling, gearbox, or pulley interface. A keyed-shaft MKD090 variant is not mechanically identical.

5. Maintenance Stock for Obsolete Indramat Systems

The model is useful as a maintenance spare for legacy machines where the original servo motor configuration is no longer routinely available through normal production channels.

Pain point: A stored motor needs electrical and mechanical verification before being released for production use.

 

QA & Live Testing SOP

1. Identity Verification

• Photograph the complete motor nameplate.
• Confirm MKD090B-047-GG0-KN.
• Verify material/order number R911263066.
• Confirm the 047 winding code.
• Confirm resolver feedback.
• Confirm plain shaft and absence of a holding brake.
• Record serial number and manufacturing information.

2. Mechanical Inspection

• Verify the 140 mm flange.
• Verify the 110 mm centering diameter.
• Inspect the plain shaft for scoring, corrosion, impact damage, and coupling wear.
• Inspect the shaft sealing ring.
• Rotate the shaft manually.
• Check for bearing roughness, abnormal noise, radial play, and axial play.
• Inspect the connection box for damaged insulation, corrosion, or loose terminals.

3. Winding Test

• Measure phase-to-phase resistance.
• Compare all three phase readings for balance.
• Perform an appropriate insulation-resistance test.
• Check each phase against the motor frame.
• Record resistance and insulation results with ambient temperature.
• Do not connect high-voltage insulation-test equipment to the resolver circuitry.

4. Resolver Test

• Inspect the resolver wiring and terminal connections.
• Check for corrosion, loose connections, or damaged cable insulation.
• Connect only to a compatible Rexroth/Indramat test drive.
• Verify resolver feedback detection.
• Confirm feedback direction at low speed.
• Confirm stable speed and position feedback during controlled rotation.

5. Controlled Rotation Test

• Start at low speed with current limits active.
• Confirm correct rotation direction.
• Monitor motor current and following error.
• Check bearing noise and vibration.
• Verify smooth acceleration and deceleration.
• Increase speed progressively within the limits of the test fixture.
• Do not use 5,000 RPM as a routine incoming-test speed.

6. Brake Configuration Check

This motor has no integrated holding brake.

Verify that:

• The machine does not require a motor-mounted holding brake.
• Any external braking or load-retention system is functional.
• Vertical-axis applications have an independent load-holding method.
• The drive configuration does not expect a brake feedback or brake-control circuit associated with this motor.

7. Final Documentation and Packaging

• Record nameplate photographs and serial number.
• Document winding resistance and insulation results.
• Document resolver test results.
• Record low-speed rotation and vibration observations.
• Protect the plain shaft from impact.
• Protect the terminal/connection box against moisture and mechanical shock.
• Use rigid packaging that prevents shaft loading during transport.

 

Field Engineer’s Pitfall Guide

❗ GG0 is a specific configuration.
The first G identifies resolver feedback, the second G identifies the plain shaft, and 0 identifies the absence of a holding brake. Do not interpret GG0 as a generic MKD090 configuration.

❗ Do not confuse this model with a K-feedback variant.
The G feedback configuration is resolver feedback. The K configuration adds an integrated multiturn absolute encoder. These are not equivalent feedback arrangements.

❗ Do not confuse natural-cooling and surface-cooling ratings.
For MKD090B-047, the documented continuous standstill torque is 12.0 Nm at 60 K natural cooling, 13.5 Nm at 100 K natural cooling, and 15.0 Nm at 60 K surface cooling. The applicable value depends on the actual cooling and thermal conditions.

❗ Rated torque is not standstill torque.
The natural-cooling rated operating point is 6.2 Nm at 3,500 RPM, while continuous standstill torque is 12.0 Nm. These values describe different operating conditions.

❗ No motor brake is included in GG0.
If the original machine used a brake-equipped motor, this configuration requires careful review of the load-retention and drive-control architecture before substitution.

❗ Do not confuse characteristic speed with maximum speed.
The documented values are 3,200 RPM characteristic speed, 3,500 RPM rated speed, and 5,000 RPM maximum speed. They should not be used interchangeably for commissioning limits.

 

Intent-Driven FAQ

What is the Bosch Rexroth MKD090B-047-GG0-KN?

It is a Bosch Rexroth Indramat MKD permanent-magnet synchronous servo motor with a 090B frame, 047 winding, resolver feedback, plain shaft, and no integrated holding brake.

What is the material number?

The documented material/order number is R911263066.

es the have a holding brake?

No. The GG0 configuration has no integrated holding brake.

What feedback does this motor use?

It uses resolver feedback. The G feedback code should not be confused with the K configuration, which includes an integrated multiturn absolute encoder.

Does it have a keyed shaft?

No. The second G in GG0 identifies the plain shaft with shaft sealing ring.

What is the continuous standstill torque?

The natural-cooling value is 12.0 Nm at 60 K motor overtemperature. Higher values are documented for other thermal/cooling conditions.

What is the rated power?

At the natural-cooling 60 K operating point, the rated power is 2.7 kW at 3,500 RPM.

What is the maximum speed?

The published technical data specifies 5,000 RPM maximum speed. The characteristic speed is 3,200 RPM and rated speed is 3,500 RPM.

What are the mounting dimensions?

The motor uses a 140 mm flange and 110 mm centering diameter.