Kollmorgen AKM54K-ANC2AA00
Kollmorgen AKM54K-ANC2AA00
Kollmorgen AKM54K-ANC2AA00
Kollmorgen AKM54K-ANC2AA00
Kollmorgen AKM54K-ANC2AA00

Kollmorgen AKM54K-ANC2AA00 | 3.87kW High-Torque Servo Motor with 2-Pin Resolver – Field Service Notes

  • Model: AKM54K-ANC2AA00 (AKM Series)
  • Alt. P/N: AKM54K-ANC2R-00 (resolver with brake variant), AKM54K-ACC2C-00 (different connector configuration)
  • Product Series: Kollmorgen AKM Brushless Servomotors
  • Hardware Type: Brushless Permanent Magnet AC Servo Motor
  • Key Feature: 3.87kW rated power with 14.4 Nm stall torque, 640VDC max bus voltage, and 16-bit 2-pin resolver feedback in a 108mm IEC frame
  • Primary Field Use: Heavy material handling, large gantry systems, and high-torque positioning axes requiring significant power density and precise feedback in industrial automation.
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Part number: Kollmorgen AKM54K-ANC2AA00
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Description

Hard-Numbers: Technical Specifications

  • Motor Type: Brushless permanent magnet synchronous servo (3-phase)
  • Frame Size: IEC 108mm square flange (NEMA 42 equivalent)
  • Winding Type: K (optimized for 640VDC bus operation)
  • Rated Speed: 4000 RPM
  • Max Mechanical Speed: 6000 RPM
  • Rated Power: 3.87 kW (5.19 HP) at 640VDC bus
  • Stall Torque: 14.4 Nm (127 lb-in) continuous at 100°C winding ΔT
  • Nominal Torque: 9.25 Nm (82 lb-in) at rated speed
  • Peak Torque: ~38-42 Nm (estimated 3× stall, short-term overload)
  • Rated Current: 9.7 Arms continuous at stall (100°C ΔT)
  • Peak Current: ~29 Arms (estimated, corresponds to peak torque)
  • Voltage Constant (K_E): ~95-105 mV/min (line-to-line back-EMF, estimated for 640V class)
  • Torque Constant (K_T): ~1.48 Nm/A (line-to-line, estimated)
  • Winding Resistance (R_20): ~0.8-1.2 Ω (line-to-line, cold, estimated)
  • Winding Inductance (L): ~8-12 mH (line-to-line, estimated)
  • Rotor Inertia: ~3.5-4.5 × 10⁻⁴ kg·m² (3.5-4.5 kg·cm², without brake)
  • Mechanical Time Constant: ~6-8 ms
  • Thermal Time Constant: 25-30 minutes (winding), 50-60 minutes (housing)
  • Insulation Class: F (155°C) with Class B temperature rise (80K)
  • Protection Class: IP65 (dust-tight, low-pressure water jet protected)
  • Vibration Class: N (per DIN EN 60034-14)
  • Mounting: IEC 108mm square flange, 24mm keyed or smooth shaft (variant dependent)
  • Shaft Load: 1000-1200 N radial (max at shaft end), 400-500 N axial
  • Feedback Device: 16-bit 2-pin resolver (hollow shaft, “AA” suffix indicates specific resolver configuration)
  • Brake Option: Not included in -ANC2AA00 variant (see -ANC2R-00 for brake option)
  • Connectors: 2 × angled rotatable M23 Speed Tec Ready connectors
  • Operating Temperature: 0°C to +40°C (ambient, derate above 40°C)
  • Storage Temperature: -20°C to +70°C
  • Weight: ~12-15 kg (26-33 lbs)
  • Dimensions: 108 × 108 mm flange, ~250-280 mm length
  • Compatible Drives: Kollmorgen AKD series (640V class), S700 series, third-party 640VDC-class servo amplifiersKollmorgen AKM54K-ANC2AA00

The Real-World Problem It Solves

Heavy material handling systems and large gantry robots need motors that can deliver serious torque without requiring oversized gearboxes or liquid cooling. The AKM54K-ANC2AA00 eliminates the “power vs. size” compromise by packing 3.87kW and 14.4 Nm stall torque into a 108mm frame that runs on standard 640VDC industrial bus voltage. It handles the messy reality of palletizing heavy loads, large format cutting machines, and high-inertia positioning systems where you need raw torque and speed without the maintenance headaches of brushed motors or the complexity of hydraulic systems.
Where you’ll typically find it:
  • Heavy palletizing and depalletizing robots handling 50kg+ payloads
  • Large CNC routers and plasma cutting tables with high inertia gantry systems
  • Automated storage and retrieval systems (AS/RS) with high-speed vertical lifts
  • Metal forming and stamping press feed mechanisms requiring precise torque control
This motor keeps your heavy axes moving with authority—no gearboxes to wear out, no hydraulic leaks, just solid-state servo performance with resolver feedback that doesn’t drift.

Hardware Architecture & Under-the-Hood Logic

The AKM54K-ANC2AA00 isn’t just a scaled-up version of smaller AKM motors—it’s a high-mass design optimized for thermal capacity and electromagnetic efficiency at 640V. The “K” winding is specifically wound for high-voltage operation, reducing current requirements for a given power level compared to lower voltage alternatives. The 16-bit 2-pin resolver provides absolute position feedback without the battery backup headaches of encoders, while the hollow shaft design allows for direct coupling or through-shaft applications.
Internal Construction:
  1. Stator Assembly: Heavy-gauge laminated steel core with distributed 3-phase windings, vacuum-pressure impregnated (VPI) for thermal conduction and moisture resistance
  2. Rotor Assembly: High-energy neodymium-iron-boron (NdFeB) magnets on steel hub, balanced for 6000 RPM operation with 1.2× overspeed margin
  3. Resolver Feedback: 16-bit absolute position transducer (2-pole brushless resolver) with hollow shaft configuration for flexible mounting
  4. Bearing System: Oversized sealed ball bearings (greased for life), rated for 25,000+ hours at rated load and speed
  5. Thermal Protection: PTC thermistors embedded in windings (130°C trip) for drive-based overload protection
  6. Connector System: Dual M23 Speed Tec connectors (power and feedback) with rotatable angled exits for flexible cable routing

    Kollmorgen AKM54K-ANC2AA00

    Kollmorgen AKM54K-ANC2AA00

Field Service Pitfalls: What Rookies Get Wrong

Assuming All AKM54K Variants Are Interchangeable
The AKM54K series has multiple winding types (C, E, G, H, K, L, M, etc.) with vastly different voltage and current characteristics. Engineers grab a “K” winding motor to replace a “C” winding and wonder why the drive faults on overvoltage or the motor won’t produce rated torque.
  • Field Rule: The “K” winding is specifically for 640VDC bus operation. Verify your drive’s DC bus voltage before ordering. A “C” winding (320V) motor on a 640V bus will overheat and fail; a “K” winding on a 320V bus will produce only 50% torque. Check the nameplate winding code and drive compatibility chart. If you must substitute, recalculate the torque constant (K_T) and voltage constant (K_E) for the new winding—these change significantly between variants.
Ignoring the 640VDC Bus Voltage Requirement
The AKM54K-ANC2AA00 requires a 640VDC bus (from 480VAC input) to achieve rated performance. Rookies pair this with 400V-class drives (320VDC bus) and wonder why they can’t get 3.87kW or why the motor runs hot at lower speeds.
  • Quick Fix: Verify your drive’s DC bus voltage. The AKM54K-ANC2AA00 requires ~640VDC (from 480VAC input) to achieve rated performance. If you’re using a 400V input drive with ~560VDC bus, you can run the motor but will lose ~15% torque. If you’re using a 230V input drive with ~325VDC bus, you need a different winding variant (C or E). Check the motor nameplate and drive specifications—voltage mismatch is a common cause of poor performance in high-power servo systems. The “K” winding has a high back-EMF constant—running it undervoltage results in weak torque and excessive current draw.

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