Kollmorgen AKM31C-RNS2LB03 Servo Motor

Detailed Product Description

1. Model Code Full Definition

Basic Model：AKM31C

• AKM: Kollmorgen AC permanent magnet synchronous servo motor series

• 3: Frame Size 3 — 90mm IEC B5 Round Flange

• 1: Stack Length 1 — Short stator stack, low inertia, high speed version

• C: Winding Grade C — 400~480V AC high voltage winding, 640V DC bus compatible

Configuration Code：RNS2LB

• R: Mounting — Standard IEC B5 90mm round flange

• N: Shaft — Smooth shaft without keyway, with M8 threaded hole at shaft end

• S: Feedback — EnDat 2.2 Multi-turn absolute encoder

• 2: Brake — 24VDC power-off holding brake

• L: Connector — M23 rotatable combined power/feedback connector

• B: Special option — Shaft lip seal, full IP65 protection, enhanced temperature-resistant winding

Suffix：03

2. Electrical Performance Specifications

• Continuous Stall Torque: 6.0 N·m

• Rated Torque: 4.8 N·m

• Peak Torque: 24.0 N·m (4× overload capability)

• Rated Power: 3.0 kW

• Max Speed: 7000 rpm

• Rated Current: 6.8 A RMS

• Peak Current: 27.2 A RMS

• Line Resistance (25℃): 1.05 Ω

• Line Inductance: 4.2 mH

• Rotor Inertia: 1.2 × 10⁻⁴ kg·m²

• Insulation Class: F Class (155℃)

• Compatible Power Supply: 3-phase 400/480V AC, 640V DC bus

3. Feedback System (EnDat 2.2 Absolute)

• Type: Heidenhain EnDat 2.2 Digital Multi-turn Absolute Encoder

• Single-turn Resolution: 24-bit (16,777,216 counts/rev)

• Multi-turn Range: 4096 revolutions (12-bit)

• Communication: High-speed serial EnDat 2.2

• Working Voltage: 5VDC / 180mA

• Key Features:

  • No battery required, absolute position on power-up

  • No homing needed after power cycle

  • Strong anti-interference, support long-distance wiring

  • Automatic motor parameter identification with Kollmorgen drives

  • Compatible with mainstream third-party servo drives

4. Mechanical Structure Specifications

• Mounting Flange: IEC B5 90mm round flange, 6×M6 mounting holes

• Shaft Diameter: φ16mm smooth shaft without keyway

• Shaft Extension: 25mm (custom extended length for -03)

• Shaft End: With M8 mounting threaded hole + shaft lip seal

• Connector: M23 rotatable integrated connector (power + feedback combined)

• Brake Specification: 24VDC, holding torque ≥7.2N·m, power-off self-locking

• Protection Class: IP65 whole body (motor housing + shaft end)

• Overall Weight: Approx 4.2 kg

• Bearing: Heavy-duty double bearing, lifetime lubrication maintenance-free

• Vibration / Shock Resistance: Industrial grade 15g / 75g

5. Environmental Conditions & Certifications

• Operating Temperature: -20℃ ~ +40℃ (no derating)

• Storage Temperature: -30℃ ~ +85℃

• Relative Humidity: 5%~95% RH, non-condensing

• Certifications: CE, UL, cULus, RoHS, CSA

• Working Altitude: ≤1000m without power derating

6. Core Product Features

1. High Voltage 480V Winding

   Directly matches 400/480V industrial three-phase power grid, low line loss, stable long-distance transmission, high system efficiency.
2. Short Stack Low Inertia High Speed

   Short stator stack design realizes low rotor inertia, fast dynamic response, supports 7000rpm high-speed operation for high-precision fast positioning.
3. EnDat 2.2 High Precision Absolute Feedback

   24-bit high resolution + 4096 multi-turn memory; power-on direct position reading, no mechanical homing required, ideal for automated production lines and precision equipment.
4. IEC B5 Standard Flange

   90mm European standard mounting dimension, strong versatility, easy replacement and mechanical matching.
5. Smooth Shaft + IP65 Full Protection

   Smooth shaft suits flexible coupling installation; shaft lip seal achieves full IP65 dustproof and splash-proof, adaptable to harsh industrial workshop environments.
6. 24VDC Power-off Holding Brake

   Power-off self-locking design, effectively prevents vertical axis sliding and falling, safe for lifting, flipping and vertical load mechanisms.
7. Rotatable M23 Connector

   360° arbitrary wiring angle, simplifies on-site cabling, anti-vibration and easy maintenance.
8. -03 Heavy-duty Custom Version

   Reinforced bearing, extended shaft, optimized temperature rise, supports 24-hour continuous heavy-duty operation.

7. Compatible Drives

• Kollmorgen: AKD-P02407, AKD-P03607, AKD2G 480V series

• Third-party: Siemens S210, Beckhoff AX5000, B&R ACOPOS, Rexroth IndraDrive

• Supported Protocols: EnDat 2.2, EtherCAT, PROFIdrive, CANopen

8. Typical Applications

9. Product Summary