R911283876 (MKD112D-027-GP0-BN)

MKD Synchronous Motors

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The R911283876 (MKD112D-027-GP0-BN) is a Bosch Rexroth synchronous servo motor featuring surface and natural cooling, with permissible overtemperature values of 60K and 100K respectively. It operates in ambient temperatures from 0°C to 40°C and allows transport or storage from -20°C to 80°C, with a maximum installation altitude of 1000 m above sea level. Mechanical properties include a shaft with keyway and shaft seal, flange size of 192 mm, centering diameter of 130 mm, and a total weight of 56 kg. Electrical parameters include a continuous torque at standstill of 48 Nm, continuous current from 31.6 to 47.4 A, winding inductivity of 5.65 mH, torque constant of 1.7 Nm/A, voltage constant of 154.5 V, winding resistance of 0.35 Ohms at 20°C, and a rated frequency of 133 Hz. The motor is rated for 15 kW output, 35 A current, 400 V AC supply, includes resolver feedback (RSF) for relative position detection, and complies with IP65 protection class.

Technical Specifications

Cooling
Surface or Natural

Permissible Transport and Storage Temperature
-20 to +800C

Ambient Temperature
00C to 400C

Maximum Set-up Height
1000 MSL

Weight
56kg

Recommended Pole Pairs
4

Winding Inductivity
5.65 Mh

Voltage Constant
154.5 V

Torque Constant
1.7Nm/A

Winding Resistance
0.35 Ohms at 200C

Characteristic Motor Speed
3000 min-1

Rated Speed
2000 min-1

Rated Frequency
133Hz

Frequently Asked Questions

What are the mechanical implications of the keyed shaft per DIN 6885 and shaft seal on the MKD112D-027-GP0-BN for backlash control and ingress resistance in servo gearhead couplings?

The parallel key transmits torque without clamp slippage, maintaining torsional stiffness for precision indexing. The sealing ring reduces lubricant washout and particulates ingress at the bearing journal, extending life in dusty or spray-prone stations.

Under natural convection, what thermal constants and duty assumptions govern the MKD112D-027-GP0-BN’s 48 Nm continuous standstill torque at 35 A, and how do surface cooling or overtemperature allowances shift continuous ratings?

Rexroth characterizes continuous torque with specified housing overtemperature and time constants; MKD112D shows ~90/40-minute thermal constants (natural/surface). Increased cooling or permitted ΔT elevates continuous torque while maintaining insulation limits and resolver stability.

How do the 130 mm centering diameter, 112 frame, and flange mounting of MKD112D-027-GP0-BN influence concentricity, shaft runout, and repeatable alignment when swapping motors on precision fixtures?

The pilot diameter locates the stator concentrically to the machine housing, controlling coaxiality independent of bolt clearance. That geometry stabilizes runout and simplifies repeatable replacement without re-boring adapter plates.

Is the MKD112D-027-GP0-BN’s IP65 protection and ~45 kg mass adequate for washdown-adjacent packaging lines without compromising bearing preload or connector sealing on Side-B terminations?

IP65 withstands dust and water jets, not immersion or caustic washdown; use shields in alkaline foams. Mass and Side-B connectors suit rigid conduit routing; maintain gasket integrity and torque values to preserve enclosure rating.

What cabling and EMC practices are recommended for MKD112D-027-GP0-BN resolver and power leads to minimize conducted emissions and angle noise in high-dI/dt cabinets?

Rexroth supplies pre-qualified cable sets with braided shields grounded 360° at entry to segregate motor/power from encoder routing and maintains minimum bending radii. Its ferrites and cabinet bonding reduce common-mode voltages near drives.

Common Misspellings

Internal Product Review

Bosch Rexroth Indramat produces MKD112D-027-GP0-BN as a servo motor with a 112 frame (length D). It provides 48 Nm standstill torque and 100 Nm of peak at up to 3000 rpm. This motor uses RSF resolver feedback and a keyed, sealed DIN-6885 shaft to ensure precise commutation. It is suits machine tools, packaging lines and printing presses.