Rexroth MKD071B-061-KP0-KN

Core Technical & Performance Parameters

• Rated standstill continuous torque: 8.0 N·m (60K temperature rise) / 9.0 N·m (100K temperature rise)
• Peak torque: 36 N·m; Torque constant: 0.77 N·m/A
• Continuous rated current: 11.2 A; Peak current: 50.4 A
• Winding resistance: 1.45 Ω; Winding inductance: 7.2 mH
• Nominal characteristic speed: 4500 rpm
• Flange dimension: 115 mm square flange, centering diameter 95 mm
• Shaft specification: Keyed solid shaft complying with DIN 6885-1, built-in radial shaft sealing ring
• Protection class: IP65 for housing, IP54 for encoder connector
• Insulation class: Class F (max winding operating temperature 150°C)
• Operating ambient temperature: 0°C ~ +40°C; Storage temperature: -25°C ~ +70°C
• Vibration resistance: Class R (ISO 2372); Shock resistance: 10 g, 11 ms pulse

Function Features

1. Resolver feedback system: Analog resolver eliminates signal loss under strong electromagnetic interference, no absolute position loss after power cycle, high durability against dust and vibration compared to optical encoders.
2. Ultra-low inertia rotor design with high-energy rare-earth neodymium magnets, supporting 0–4500 rpm rapid acceleration/deceleration without torque drop.
3. IE4 ultra-high energy efficiency winding structure, reducing continuous operation power loss by 18% vs standard servo motors.
4. Modular split housing structure, separate power connector and feedback connector for independent wiring maintenance.
5. Built-in thermal PTC temperature sensor, overheat protection signal output to servo drive.
6. Fully sealed shaft lip seal prevents coolant, metal powder and oil mist ingress in machine tool environments.

Material Composition & Structural Characteristics

• Stator housing: Die-cast aluminum alloy with black anti-corrosion powder coating, integrated radial cooling fins for natural convection heat dissipation.
• Rotor core: Laminated silicon steel sheet stack bonded with high-temperature epoxy resin; embedded sintered NdFeB permanent magnets fixed by stainless steel retaining sleeves to prevent magnet detachment at high speed.
• Shaft: Medium carbon quenched steel, precision ground surface with anti-wear hard chrome plating; integrated keyway for mechanical coupling connection.
• End caps & mounting flange: Cast aluminum alloy with CNC machined precision mounting holes and centering spigot.
• Internal insulation: Polyimide Class F enameled wire, high-temperature slot wedge and insulating paper resistant to mineral oil and cutting fluid.
• Connector housing: Reinforced glass fiber PA66 plastic, IP65 sealed cable glands with EPDM rubber gaskets.

Working Principle

Installation Requirements

1. Mount via four M8 through holes on the 115mm flange; torque mounting bolts to 12 N·m evenly in diagonal sequence to avoid flange deformation.
2. Mechanical coupling alignment tolerance: Radial runout ≤0.03 mm, angular misalignment ≤0.5°, use flexible bellows coupling to absorb vibration.
3. Cable routing separation: Power cable and resolver feedback cable must be routed in separate cable trays with minimum 15cm distance to avoid EMI interference.
4. Ambient ventilation requirement: Maintain ≥10cm clearance around motor housing for natural convection cooling; install forced air fan if ambient temperature exceeds 35°C.
5. Shaft load limitation: Max radial shaft load 2800 N, max axial load 950 N at shaft end.
6. Grounding: Connect motor housing protective earth terminal to cabinet PE bus with 4mm² copper wire.

Application Scenarios

Operation & Maintenance Precautions

1. Strictly prohibit running the motor without resolver feedback connection; resolver wiring short-circuit will cause drive overcurrent fault and permanent winding damage.
2. Do not expose the motor to direct water jet or continuous oil mist without additional protective cover, IP65 only resists splashing liquid.
3. Regularly inspect shaft seal every 6 months; replace lip seal if oil seepage appears to prevent bearing corrosion.
4. Avoid frequent emergency stop under full peak torque; repeated instantaneous overload accelerates magnet demagnetization.
5. Store spare motors in dry environment with humidity <60%, rotate shaft manually once per month to prevent bearing static corrosion.
6. Do not disassemble resolver rear housing without professional calibration tools; misalignment of resolver stator/rotor will lead to positioning deviation.