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Rexroth MHD041B-144-PG1-UN
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Rexroth MKD071B-035-KG1-KN
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Rexroth MKD025B-144-KG1-UN

Product Name
MKD series digital AC synchronous servo motor with resolver-based absolute feedback, holding brake and plain shaft.
Product Introduction
MKD025B-144-KG1-UN is a Bosch Rexroth Indramat MKD compact servo motor for small industrial axes. The 025 frame, 144 winding, integrated 1 Nm brake and resolver with absolute multiturn evaluation provide precise light-load motion control.
Category:
Description
Technical Specifications
Motor family: MKD digital AC synchronous servo.
Frame size: 025.
Length: B.
Winding code: 144.
Flange size: 54 mm.
Continuous torque at standstill: 0.9 Nm.
Nominal speed: 3000 r/min.
Rated current: 6.0 A.
Shaft: plain shaft with keyway according to DIN 6885-1 and shaft seal.
Holding brake: none.
Feedback: resolver with integrated encoder, absolute position detection over more than 4096 revolutions.
Cooling: natural convection.
Protection class: IP65.
Connection: power and feedback connectors, rotatable within 270°.
Operating temperature: up to 50°C in standard cabinet conditions.
Weight: approximately 2.0 kg depending on connector configuration.
Functional Features
Keyed shaft transmits torque under frequent reversing without slip.
Resolver feedback resists vibration, shock and electrical noise.
Integrated absolute multiturn evaluation removes repeated homing after power recovery.
No holding brake reduces rotating inertia and simplifies light-load dynamics.
IP65 sealed housing supports dusty and splash-prone production areas.
Natural convection eliminates fan maintenance.
Application Scenarios
Packaging machines, labeling systems, printing units, small feeders, electronics assembly, laboratory automation, food-processing auxiliary axes and compact multi-axis stations requiring sub-1-Nm continuous torque.
Performance Parameters
The motor sustains 0.9 Nm continuous standstill torque with 6.0 A drive current. At 3000 r/min nominal speed it supports positioning, constant-speed feeding and light indexing. Absolute resolver feedback maintains repeatable position data through power cycles. IP65 construction preserves performance in contaminated environments.
Material Composition
Aluminum or cast servo housing, copper stator windings, permanent-magnet rotor, steel keyed shaft with seal, resolver and encoder electronics, molded connector inserts, laminated electrical insulation.
Structural Characteristics
Compact 025 cylindrical or square MHD-style body, 54 mm mounting flange, keyway shaft extension, rear dual connector plate for power and feedback, sealed resolver compartment, no brake cartridge.
Working Principle
The servo drive supplies regulated three-phase current to the stator. The permanent-magnet rotor follows the rotating field. The resolver measures rotor angle and speed, and the integrated electronics convert the signal into absolute multiturn position data. The drive adjusts current vectors for torque, speed or position control. Heat is dissipated by natural convection through the housing surface.
Installation Requirements
Mount the motor on a flat 54 mm flange with correct shaft alignment. Use couplings rated for at least 0.9 Nm continuous and transient peak torque. Orient power and resolver connectors within the 270° range for shortest cable routing. Separate power and feedback cables with shielded wiring and proper grounding. Verify drive parameters for 144 winding, resolver absolute feedback and keyed-shaft mechanical data.
Usage Precautions
Confirm the no-brake configuration before using the motor on vertical or fail-safe holding axes. Avoid exceeding rated 6.0 A continuous current without drive thermal derating. Inspect shaft seal and keyway seating during coupling installation. Keep housing surfaces clear for convection cooling. Validate resolver communication after cable replacement.
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