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Kollmorgen S406AM-CA

Product Series: S400 (Compact AC Servo Motor Family)

Product Introduction:
The S406AM-CA is a compact AC servo motor from Kollmorgen’s S400 product line, designed for general-purpose motion control applications requiring high dynamic performance in a small footprint. It features an integrated absolute encoder and is compatible with Kollmorgen AKD, BDS, and AKM series servo drives.

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Detailed content

Model Breakdown:

  • S400 = Product Family (Compact AC Servo Motor)
  • 06 = Frame Size: 60mm (Flange)
  • A = Stack Length Code: Medium Length
  • M = Winding Configuration: Medium Torque / Medium Speed
  • C = Shaft Type: Keyed Shaft with Keyway (DIN 6885-1)
  • A = Feedback: Absolute Encoder (Single-turn, 17-bit BiSS-C)

Technical Specifications:

Parameter Value
Frame Size (Flange) 60mm (NEMA 23 equivalent)
Stack Length Medium (approx. 95mm body length)
Rated Torque (Continuous) 1.27 Nm
Peak Torque 3.81 Nm (3 sec)
Rated Speed 3,000 RPM
Max Speed 4,500 RPM
Torque Constant (Kt) 0.42 Nm/A
Rated Current 6.0A RMS per phase
Peak Current 18A peak (3 sec)
Phase Resistance 1.8 Ω (phase-to-phase, 20°C)
Phase Inductance 2.5 mH
Rotor Inertia 22 g·cm²
Weight 1.1 kg (motor only)
Encoder Type Single-turn Absolute, 17-bit (131,072 counts/rev), BiSS-C
Shaft Type Keyed Shaft (DIN 6885-1, 8mm diameter × 22mm length)
Shaft Extension 22mm from mounting face
Holding Brake No (CA = No Brake)
Insulation Class Class F (155°C)
IP Rating IP65 (with optional seal kit)
Operating Temperature 0°C to +40°C (continuous)
Ambient Humidity 20% to 85% RH (non-condensing)

Functional Features:

  • Single-turn absolute encoder — position known immediately on power-up.
  • High torque-to-inertia ratio: 58:1 — excellent dynamic response.
  • Smooth sinusoidal commutation — low torque ripple (< 3% of rated torque).
  • Wide speed range — operates efficiently from 0 to 4,500 RPM.
  • IP65 protection — suitable for dusty and washdown environments (with seal kit).

Structural Features:

  • Housing: Die-cast aluminum with anodized finish.
  • Stator: M19 silicon steel laminations, Class F insulated windings.
  • Rotor: N42SH NdFeB magnets, carbon-fiber sleeve retention.
  • Bearings: Sealed ball bearings (6000-2RS type), pre-lubricated for life.
  • Shaft: Hardened steel (C45), ground to h6 tolerance.
  • Connector: M23 17-pin (power + encoder) on rear face.

Material Composition:

  • Housing: Die-cast Aluminum ADC12
  • Stator Core: M19 Silicon Steel (0.35mm lamination)
  • Windings: Class F (155°C) Polyester-imide enamel copper
  • Magnets: N42SH Neodymium-Iron-Boron (NdFeB)
  • Shaft: C45 Carbon Steel, induction hardened to 55 HRC
  • Bearings: Chrome steel (AISI 52100), 2RS sealed

Working Principle:
The S406AM-CA is a three-phase permanent magnet synchronous motor (PMSM). The AKD/BDS drive sends sinusoidal currents to the three stator windings, creating a rotating magnetic field. The NdFeB rotor magnets lock to this field and rotate synchronously. The BiSS-C absolute encoder on the shaft provides real-time position feedback (17-bit resolution) to the drive for closed-loop servo control.

Advantages:

  • Compact 60mm flange — fits tight machine envelopes.
  • Absolute feedback — no homing cycle required after power-off.
  • High dynamic response — suitable for high-speed pick-and-place.
  • Low maintenance — sealed bearings, no brushes.

Applicable Industries:

  • Packaging machines
  • 3D printers
  • Small CNC routers
  • Laboratory automation
  • Medical devices
  • Semiconductor handling

Installation Requirements:

  • Mount using 4× M5 mounting holes on 60mm flange (bolt pattern: 50mm × 50mm).
  • Tighten mounting bolts to 2.5 Nm torque in star pattern.
  • Couple to load using flexible coupling — do not exceed 0.1mm misalignment.
  • Ground motor housing to PE terminal — resistance ≤ 0.1Ω.
  • Use shielded cable (CH series recommended) — maximum 15m.

Usage Precautions:

  • Do not exceed 4,500 RPM — risk of bearing failure and magnet delamination.
  • Do not apply axial loads > 50N on shaft — bearings are not rated for thrust.
  • Do not run motor without encoder connected — drive will fault (E-STOP).
  • Derate torque by 15% at 40°C ambient (vs. 20°C rating).
  • Re-grease bearings only if using non-sealed variant — this model uses sealed bearings (no re-grease).

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