Rexroth MKD041B-144-KG1-KN

Core Technical Specifications

• Frame Size: 041, Length Code B
• Continuous Standstill Torque: 2.7 Nm
• Integrated Holding Brake: 2.2 Nm holding torque, 24VDC electromagnetic release
• Shaft Design: Plain solid shaft with standard shaft sealing ring
• Feedback Code KG1: Resolver + multi-turn absolute encoder composite feedback
• Winding Code 144: Medium speed high dynamic winding design
• Flange Size: 82 mm, Centering Diameter 50 mm
• Rotor Moment of Inertia: 0.72 kg·cm² ultra-low inertia
• Rated Operating Speed: 4500 rpm; Max transient speed: 6000 rpm
• Peak Current: 34 A for rapid acceleration and deceleration
• Protection Grade: IP65 full housing sealing
• Cooling Mode: Natural convection surface cooling
• Motor Weight: 3.2 kg
• Insulation Class: F
• Operating Ambient Temperature: 0°C ~ +40°C

Function Features

1. Ultra-low rotor inertia, ultra-high acceleration capacity for high-speed short-stroke reciprocating motion
2. Composite resolver + absolute encoder feedback, both high-speed dynamic response and power-off position memory
3. Built-in 2.2Nm holding brake, lock small vertical axis load after power failure to prevent falling
4. Compact 82mm flange miniaturized structure, suitable for narrow machine frame installation space
5. IP65 dust and water splash resistance, adapt to packaging, electronic assembly workshop environment
6. Side B connector layout, flexible cable routing direction for compact equipment layout
7. KTY temperature sensor embedded inside stator, real-time overheat protection linkage with Rexroth servo drives
8. Standard DIN flange mounting, directly matched with Rexroth miniature planetary reducers

Working Principle

Material & Structural Characteristics

• Motor Housing: Thin-wall die-cast aluminum alloy with black anti-corrosion coating, compact heat dissipation rib structure
• Rotor: Small-diameter solid steel shaft + mini neodymium iron boron permanent magnet, ultra-low inertia design
• Bearing Set: Miniature high-speed precision rolling bearings with long-life high-temperature grease
• Shaft Seal: Single-layer nitrile rubber rotary seal ring, block fine dust and water mist
• Brake Module: Mini dry friction disc brake assembly integrated at rear end cap
• Encoder End Cap: Sealed aluminum alloy cover with multi-pin waterproof aviation connector

Installation Requirements

1. 82mm standard four-hole flange mounting, fixing bolt torque 8 Nm
2. Shaft coupling coaxiality error ≤0.02 mm to reduce high-speed bearing vibration
3. Horizontal or vertical installation allowed; vertical axis must enable brake function
4. Use original Rexroth miniature shielded servo power and encoder cables
5. Reserve ≥20 mm heat dissipation gap around motor housing, avoid enclosed narrow installation cavity
6. Cabinet earth bar ground wire connected to motor mounting plate for EMC anti-interference

Application Scenarios

• Electronic assembly machine small Z-axis lifting positioning
• High-speed labeling machine horizontal reciprocating feed axis
• Desktop small CNC engraving machine auxiliary feed servo
• Automated testing equipment probe precise positioning axis
• Small packaging machine cutter and film stretching servo axes
• Semiconductor wafer transfer small high-speed handling axes

Operation & Maintenance Notes

1. Do not operate motor without brake power supply when installed on vertical load axes
2. Avoid continuous long-time operation at 6000 rpm maximum speed to extend bearing service life
3. Clean motor housing dust and oil mist every 3 months to maintain heat dissipation
4. Do not disassemble rear encoder end cap without professional tools, absolute position data will be lost
5. Regularly check connector sealing ring aging condition to prevent moisture entering internal circuit
6. If abnormal vibration occurs during operation, recheck shaft coupling coaxiality and mounting bolt tightness