R911284888 (MKD112D-027-KG0-BN)

MKD Synchronous Motors

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The R911284888 (MKD112D-027-KG0-BN) is a Rexroth Bosch synchronous servo motor from the MKD112 series, featuring a stator with windings and a rotor shaft with permanent magnets. This model has a motor size of 112, length D, and winding code 027, delivering a continuous standstill torque of 48.0 Nm and a maximum speed of 4500 RPM. It operates with a voltage constant of 86.2 V/kRPM and a torque constant of 1.43 Nm/A. The motor integrates a plain shaft with a shaft seal, resolver feedback with integrated multiturn absolute position detection (>4096 revolutions), and a motor temperature monitor. The flange size is 192 mm, connection is made via a terminal box at side B, and the unit weighs 45 kg. Protection category is IP65 and cooling is by natural convection. This unit is supplied without a holding brake or additional designs.

Technical Specifications

Motor Installation
Any Orientation

Overload Protection
Yes

Usage
Servo or Main Drive

Motor Size
112

Motor Length
D

Winding Code
027

Encoder
Multiturn Absolute Encoder

Shaft
Plain Shaft with Sealing Ring

Cooling Mode
Natural Convection

Motor Speed
2000min-1

Rotor Inertia
110.0 x 10-4

Continuous Current at standstill
15.9A

Continuous Torque at Standstill
17.0Nm

Peak Current
59.0A

Number of Poles
4

Winding Inductance
14.0mH

Motor Mass
23.0Kg

Storage and Transport Temperature
-20 to 80 degrees

Permissible Temperature
0 to 40 degrees

Protection Category
IP 65

Insulation Class
F

Frequently Asked Questions

How should the 48.0 Nm continuous stall and 180 Nm peak of MKD112D-027-KG0-BN be mapped to duty-cycle limits?

Its thermal modeling in the drive is important to ensure RMS torque and remain within the continuous region while allowing short-term overloads for acceleration. Its repetitive peaks must respect motor time constants and cooling assumptions to prevent cumulative heating.

Which drive-sizing considerations follow from the 40 A rated and 120 A peak current of MKD112D-027-KG0-BN?

The selection of an amplifier whose continuous/peak output envelopes exceed these currents with margin and whose DC-bus voltage matches the EMF constant of winding 027. Its cable ampacity, fusing and bus energy handling for regenerative events is also important.

How does the 130 mm centering (pilot) diameter of MKD112D-027-KG0-BN influence mechanical alignment and runout?

The pilot handles radial location for decoupling alignment from bolt clearance and improving concentricity. Its accurate pilot fits lower synchronous runout to reduce cogging-like ripple in velocity and improving contour fidelity on CNC axes.

How does “absolute (>4096 revs)” interact with the encoder’s multiturn gear and battery life on MKD112D-027-KG0-BN?

The multiturn mechanism counts revolutions mechanically/electronically and preserves count via a battery for maintaining absolute position after outages. Its plan periodic battery replacement (typ. multi-year) to avoid reversion to relative mode and forced re-homing.

What EMC and grounding practices apply to the terminal-box connection used by MKD112D-027-KG0-BN?

Its motor-and-feedback cable shields with 360-degree bonding at entry and provide a short for low-impedance PE connection to the machine ground. It keeps power and feedback routes segregated and minimizes loop areas to reduce common-mode emissions.

Common Misspellings

Internal Product Review

The MKD112D-027-KG0-BN MKD synchronous motor from Bosch Rexroth delivers 48 Nm torque at standstill and 180 Nm peak with 40/120 A current capability. Its resolver with integrated multiturn absolute detection sharpens indexing. This unit has a sealed, plain shaft design and possess 130 mm pilot for simplified alignment in applications such as packaging/printing and automated handling.

1620 Old Apex Road
Cary, NC 27513, USA

Toll Free: 1-888-551-3082
International: 1-919-443-0207

Fax: 1-919-867-6204

[email protected]

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North Carolina Office

Indramat USA
1620 Old Apex Road
Cary, NC 27513
USA

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Toll Free: 1-888-551-3082
International: 1-919-443-0207

Indramat USA sells factory new and pre-owned surplus products and maintains channels to procure supply. Indramat USA is not affiliated with nor an authorized distributor or representative of any manufacturers, brands or products listed. Designated trademarks, brand names, and brands appearing herein are the property of their respective owners.