Kollmorgen AKM21C-ANBNR-00

Product Name AKM21C Low-Inertia Permanent Magnet Synchronous Servo Motor

Product Overview The AKM21C-ANBNR-00 is a compact-frame brushless servo motor from the Kollmorgen AKM family. It combines high torque density, low rotor inertia, and smooth rotation in a 58 mm IEC flange package, suited for high-dynamic positioning and velocity control.

Category:
Description

Technical Specifications Frame Size: AKM2 (58 mm IEC square flange) Stack Length: C (medium stack) Continuous Stall Torque: 0.64 Nm Peak Torque: 1.92 Nm (3 × continuous) Rated Speed: 6000 rpm Maximum Speed: 8000 rpm Continuous Current: 1.42 Arms Peak Current: 4.26 Arms Rotor Inertia: 0.000094 kg·m² Torque Constant: 0.45 Nm/Arms Back-EMF Constant: 43 V/krpm Winding Code: AN (240 V class, standard winding) Feedback: B — Resolver (analog, 2-pole) Shaft: N — Smooth shaft, no keyway, no brake Connector: R — Rotatable right-angle connector Protection: IP54 (suffix 00, standard) Insulation Class: F (155 °C) Ambient Temperature: 0 °C to 40 °C (full torque), derated to 55 °C Storage Temperature: -20 °C to +85 °C Weight: Approximately 1.1 kg

Functional Features High-energy rare-earth neodymium magnets for high torque density Low cogging torque design for smooth low-speed operation Integrated resolver for robust position feedback in harsh environments Rotatable connector allows cable exit orientation adjustment in 90° increments Compatible with Kollmorgen AKD, S300, S700, and SBC drives Plug-and-play motor recognition via feedback memory on supported drives

Application Scenarios Semiconductor handling and wafer processing equipment Packaging machines, labelers, and high-speed pick-and-place Small CNC axes, 3D printers, and laboratory automation Textile and printing machinery requiring precise speed regulation

Material Composition Housing: Aluminum alloy with corrosion-resistant finish Shaft: High-strength alloy steel, ground and polished Magnets: Sintered NdFeB (neodymium-iron-boron), coated for corrosion protection Stator: Silicon-iron laminations with class-F enameled copper winding Bearings: Sealed deep-groove ball bearings, pre-lubricated with lithium grease Resolver: Brushless rotary transformer with copper windings and ferrite core

Structural Features Square IEC flange with four mounting holes, pilot diameter 50 mm Smooth cylindrical shaft, diameter 11 mm, length 24 mm Rear-mounted resolver and rotatable right-angle power/feedback connector Internal thermal protection via PTC thermistor embedded in stator winding Single-side bearing arrangement optimized for radial and axial loads

Working Principle The drive supplies three-phase sinusoidal current to the stator windings; the resolver continuously reports rotor position; the drive commutates current to maintain a 90° electrical angle between stator flux and rotor magnets, producing smooth torque proportional to current magnitude.

Installation Requirements Mount motor on a flat, rigid surface with runout ≤ 0.02 mm Align coupling to shaft within 0.05 mm TIR to avoid bearing overload Use flexible coupling rated for motor peak torque Tighten flange bolts to 6 N·m with medium-strength thread locker Ensure adequate airflow around motor housing; do not cover ventilation paths

Usage Precautions Do not apply axial or radial load beyond bearing ratings (radial ≤ 70 N at mid-shaft) Do not disassemble motor; magnetic components can pinch and demagnetize Avoid impact on shaft; resolver zero position is factory-calibrated Operate within ambient temperature range; derate current above 40 °C Use only Kollmorgen-approved cable assemblies to maintain shielding and safety

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