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Kollmorgen AKM31H-SSS22-0

Product Brief Introduction

AKM31H belongs to AKM frame size 3 compact servo motor subgroup, optimized for high acceleration, frequent start-stop short-stroke positioning applications. It adopts rare earth neodymium iron boron surface-mounted permanent magnet rotor, multi-turn SFD smart feedback device, smooth low-cogging stator winding, and standard IEC B5 flange mounting structure.
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Detailed content

Technical Specifications

  1. Electrical Parameters
    • Rated Input Bus Voltage: 320 VDC (240 VAC mains input)
    • Continuous RMS Current: 3.7 A
    • Peak RMS Current: 11.1 A (3x overload, 10s permissible)
    • Rated Continuous Power: 0.82 kW
    • Torque Constant Kt: 0.42 N·m/A rms
    • Back EMF Constant Ke: 0.061 V/RPM
    • Phase Winding Resistance: 3.02 Ω @ 25°C
    • Phase Winding Inductance: 12.7 mH
  2. Mechanical Performance Parameters
    • Continuous Rated Torque: 1.55 N·m
    • Peak Torque: 4.65 N·m
    • Rated Operating Speed: 4000 RPM
    • Maximum Safe Mechanical Speed: 8000 RPM
    • Rotor Mass Inertia: 0.000078 kg·m²
    • Cogging Torque: ≤ 1.1% of continuous rated torque
  3. Feedback System Specs (SSS22 Configuration)
    • Feedback Type: SFD22 Multi-turn Smart Feedback Device
    • Position Resolution: 27-bit absolute position detection
    • Multi-turn Count Capacity: 4096 revolutions absolute tracking
    • Communication Interface: BiSS-C serial differential signal
  4. Environmental & Insulation Specs
    • Insulation Class: F Class (155°C winding maximum temperature)
    • Operating Ambient Temperature: -5°C ~ +40°C (6% torque derate per 1000m altitude)
    • Storage Temperature: -40°C ~ +85°C
    • Protection Rating: IP65 motor housing, IP67 output shaft seal
    • Vibration Compliance: IEC 60034-14 Vibration Grade 1

Functional Features

  • Ultra-low rotor inertia delivers industry-leading acceleration response for high-cycle short stroke motion
  • SFD multi-turn absolute feedback eliminates homing sequence requirement on equipment power-up
  • Seamless plug-and-play auto-parameter identification with all AKD series servo drives
  • Skewed stator slot winding design minimizes cogging torque for ultra-smooth low-speed rotation
  • Non-keyway smooth output shaft (suffix 0) compatible with friction-fit zero-backlash shaft couplings
  • Integrated embedded PTC thermal sensor with 145°C over-temperature trip point
  • All-welded stator winding construction to eliminate loose winding wire failure points

Working Principle

AKD servo drive outputs three-phase sinusoidal variable frequency current to motor stator windings, generating rotating electromagnetic magnetic field. The surface-mounted NdFeB permanent magnet rotor synchronously tracks stator rotating field to produce precise continuous rotary torque. The rear-end SFD absolute feedback sensor captures real-time shaft angular position and multi-turn rotation count, transmitting serial digital position data back to AKD drive to close position, speed and torque control loops. Embedded PTC sensor continuously monitors winding core temperature, transmitting thermal alarm signal to drive upon exceeding threshold for automatic torque derating or safe shutdown.

Material Composition

  • Motor Housing: Extruded 6063-T5 aluminum alloy with black hard anodized anti-corrosion coating
  • Stator Lamination: 0.3mm grain-oriented silicon steel low-loss core stack
  • Rotor Magnets: Grade N38SH neodymium iron boron rare earth permanent magnets with epoxy anti-corrosion encapsulation
  • Output Shaft: 4160 alloy steel, induction hardened, black oxide anti-rust finish
  • Rear Feedback Housing: Glass-filled PA66 UL94-V0 flame retardant plastic
  • Shaft Seal: FKM fluorine rubber high-temperature oil-resistant rotary seal

Structural Characteristics

  • Standard IEC B5 front mounting flange, 80mm flange outer diameter, 4 mounting through holes
  • Smooth cylindrical output shaft diameter 14mm, no keyway, no snap ring groove
  • Rear integrated single cable connector combining three-phase power wiring and SFD feedback signal wiring
  • Natural convection cooling structure without external fan; axial ribbed housing for passive heat dissipation
  • Fully sealed rear feedback compartment to prevent dust, moisture ingress into sensor assembly
  • Single-piece front bearing retainer with double row radial ball bearing support for high-speed stability

Advantage Highlights

  • Minimal rotor inertia enables 0.01s full acceleration from standstill to rated speed
  • 27-bit absolute multi-turn feedback removes power-on homing cycle to reduce machine cycle time
  • Near-zero cogging torque maintains consistent positioning accuracy at 1 RPM ultra-low speed operation
  • Direct automatic parameter matching with Kollmorgen AKD drives cuts servo commissioning time by 70%
  • IP65 full housing protection tolerates moderate airborne coolant mist and industrial dust environments
  • F-class high-temperature insulation allows continuous full torque operation under +40°C ambient conditions
  • Single hybrid power/feedback cable reduces wiring complexity and cabinet cable routing volume

Applicable Industries

Semiconductor wafer handling equipment, electronic PCB assembly machines, high-speed pick-and-place robotics, precision vision inspection positioning stages, pharmaceutical packaging automation, laser cutting auxiliary axes, 3C product testing fixtures

Installation Requirements

  1. Mount flange bolts tightened to 8 N·m torque; mounting surface flatness tolerance ≤ 0.04mm per 100mm
  2. Horizontal shaft mounting is standard; vertical upward shaft installation requires thrust load calculation to avoid bearing premature wear
  3. Maintain minimum 30mm unobstructed clearance around ribbed motor housing for passive convection cooling
  4. Single hybrid cable shielding must be grounded at drive-side terminal only to eliminate ground loop noise
  5. Zero-backlash friction coupling required for smooth shaft; avoid rigid keyed couplings with backlash for precision positioning

Operation Precautions

  • Continuous operation above +40°C ambient requires 18% rated torque derating
  • Do not exceed 8000 RPM maximum mechanical speed to prevent permanent magnet demagnetization
  • Avoid radial shaft load exceeding 120 N at 15mm distance from front bearing face
  • Prevent direct liquid coolant jet spray onto motor housing or rear connector assembly
  • Do not apply mechanical impact to rear feedback connector housing; internal SFD sensor damage voids factory warranty
  • Long-duration stall operation at 100% torque will trigger thermal derating after 90 seconds of continuous stall

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