Technical Parameters Basic Information Brand: Kollmorgen (Danaher Motion) Model No.: AKM21G-ENGN2-00 UL File Number: E61960 Motor Type: 3-Phase Permanent Magnet Synchronous Brushless Servo Motor Frame Size: AKM21, 58mm IEC standard flange Winding Code: G (Low voltage winding, max 75 VDC bus) Feedback: ENG = SFD3 inductive single-turn absolute EnDat encoder Shaft Code: 2 = Standard φ16mm keyed shaft, no shaft seal Connector Code: N = Dual rotatable angled M23 SpeedTec connectors Suffix 00: No shaft seal, no holding brake Pole Pairs: 3 Net Weight: 0.92 kg Electrical Performance (75VDC Bus) Rated Continuous Power (Pn): 0.19 kW Rated Continuous Speed (Nn): 4000 rpm Max Mechanical Speed: 8000 rpm Standstill Continuous Stall Torque (Mo): 0.50 N·m Rated Continuous Torque (Mn): 0.46 N·m Standstill RMS Current (Iorms): 4.87 Arms Peak Torque (Mmax): 1.49 N·m Peak RMS Current (Imax): 14.61 Arms Torque Constant (Kt): 0.103 N·m/Arms Back EMF Constant (Ke): 0.051 Vrms/(rad/s) Line-Line Winding Resistance (Rm @25°C): 0.48 Ω Line-Line Inductance (Lm): 0.16 mH Rotor Moment of Inertia (J): 0.0048 kg·cm² Electrical Time Constant: 0.33 ms Mechanical & Environmental Specifications Shaft Dimension: φ16mm keyed shaft, standard DIN keyway Protection Grade: IP65 housing/flange; shaft IP54 (no shaft seal) Insulation Class: Class F, maximum winding temperature 155°C Thermal Protection: Built-in PTC thermal sensor embedded in stator windings Operating Ambient Temperature: -20°C ~ +40°C Storage Temperature: -40°C ~ +85°C Vibration Standard: EN 60034-14 Vibration Class N Mounting Standard: IEC IM B5 flange mounting, j6 pilot tolerance N per DIN42955 Bearing L10 Service Life: 20,000 hours under rated continuous load Certifications: CE, UL Listed (File E61960), EN60034-1, EN60034-5