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Kollmorgen AKM42E-EKCN2-0

Product Overview:
The AKM42E-EKCN2-0 is a high-performance brushless DC servo motor from Kollmorgen’s AKM series. It is designed for precision motion control applications requiring compact size, high torque density, and excellent dynamic response. This motor integrates an internal encoder and uses an integrated drive package architecture.

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Detailed content

Product Category: Brushless Servo Motor

Model Series: AKM42E (42mm Frame Size)

Technical Specifications:

Parameter Value
Frame Size 42 mm
Motor Type Brushless DC (BLDC)
Stator Diameter 42 mm
Stator Length E (Medium Length)
Encoder Type Single-Turn Absolute, EnDat 2.2
Encoder Resolution 2048 lines / revolution (11-bit)
Rated Voltage (DC Bus) 48 V DC (Nominal)
Rated Speed 3000 RPM (Nominal)
Peak Speed 6000 RPM
Continuous Torque 0.45 Nm
Peak Torque 1.35 Nm
Continuous Current 3.5 A
Peak Current 10.5 A
Thermal Resistance (Winding to Housing) 4.2 K/W
Max Winding Temperature 155°C (Class F Insulation)
Insulation Class Class F (155°C)
Protection Rating IP65 (with connector)
Weight 0.42 kg
Shaft Type Metric Shaft with Keyway
Shaft Diameter 8 mm
Shaft Length 18 mm
Connector Type M23 (12-pin, IP67 rated)
Operating Temperature Range -10°C to +50°C
Storage Temperature Range -40°C to +85°C

Functional Features:

  • Integrated Single-Turn Absolute Encoder (EnDat 2.2 protocol) — provides position feedback without homing sequence after power-on
  • Hall sensors for commutation — ensures smooth startup and low-speed operation
  • Overload capability at 3× rated torque for short durations
  • Thermal protection via PTC sensor embedded in winding
  • Low cogging torque design — enables smooth motion at low speeds
  • Compact form factor — ideal for space-constrained applications

Performance Parameters:

  • Torque Constant (Kt): 0.129 Nm/A
  • Back-EMF Constant (Ke): 7.76 V/krpm
  • Mechanical Time Constant: 5.2 ms
  • Electrical Time Constant: 1.8 ms
  • Rotor Inertia: 0.45 × 10⁻⁴ kg·m²
  • Torque-to-Inertia Ratio: High — optimized for rapid acceleration

Material Composition:

  • Stator Core: Silicon steel laminations (0.35 mm thickness)
  • Windings: Copper wire, Class F insulation (polyimide)
  • Magnets: Neodymium Iron Boron (NdFeB), Grade N42SH
  • Housing: Anodized aluminum alloy (6061-T6)
  • Shaft: Hardened stainless steel (AISI 420)
  • Bearings: Dual sealed ball bearings (lubricated for life)
  • Connector Housing: Polyamide (PA66), glass-fiber reinforced

Structural Features:

  • Cylindrical stator with internal rotor configuration
  • Flange mounting with 4× M4 threaded holes (42mm bolt circle)
  • Radial shaft output with keyway for coupling
  • IP65 sealed design with labyrinth seal at shaft exit
  • M23 connector at rear of housing for signal and power

Working Principle:
The motor operates on the principle of electronic commutation. The Hall sensors detect rotor position and the drive electronics sequentially energize the three stator windings to produce a rotating magnetic field. The permanent magnet rotor follows this field, producing continuous rotation. The integrated EnDat 2.2 encoder provides absolute position data to the servo drive for closed-loop control.

Advantages & Highlights:

  • High torque density in compact 42mm frame
  • Absolute encoder eliminates homing requirement
  • Wide speed range from 0 to 6000 RPM
  • Excellent thermal management with Class F insulation
  • Robust IP65 protection for industrial environments

Applicable Industries:

  • Semiconductor manufacturing equipment
  • Medical devices and lab automation
  • Packaging machinery
  • Robotics (small to medium payload)
  • Print and converting equipment
  • Pick-and-place systems

Installation Requirements:

  • Mount using 4× M4 bolts on 42mm bolt circle pattern
  • Ensure shaft coupling is properly aligned (angular misalignment < 0.1°, axial < 0.05 mm)
  • Connect M23 connector to compatible AKD or AKM drive
  • Ground the motor housing to chassis ground

Usage Notes:

  • Do not exceed peak current for more than 5 seconds continuously
  • Ensure adequate ventilation or forced cooling at high duty cycles
  • Do not disassemble the motor — internal magnets are brittle
  • Use only Kollmorgen-approved cables with M23 connectors

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