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Kollmorgen B-204-C-31

Product Name:​ GOLDLINE® B-204-C Brushless Rare-Earth Servo Motor
Series:​ GOLDLINE B (Low-Inertia, NEMA/Metric Frame)
B-204 = Frame size 20 (NEMA 42–56 equiv.), stack length 4; C = Winding code; -31 = Option (resolver feedback, standard seals, no brake, metric/NEMA flange)

Detailed content

Technical Data (typical for B-204-C):
  • Continuous (Stall) Torque @ 40 °C:​ ~4.79 Nm (42.4 lb-in)
  • Peak Torque:​ ~19.9 Nm (176 lb-in)
  • Rated Speed @ Rated Power:​ ~6200 rpm (max operating speed)
  • Rated Power:​ ~2.8 kW (3.8 HP @ 6200 rpm)
  • Winding Voltage:​ 230 VAC (320 VDC bus) — “C” winding
  • Continuous Current:​ ~6–7 A RMS (check nameplate)
  • Peak Current:​ ~22 A RMS (short term)
  • Feedback:​ 2-speed resolver (standard for -C-31 config)
  • Insulation:​ Class H (180 °C)
  • Thermostat:​ Normally-closed bi-metallic thermal protector (opens on over-temp)
  • Brake:​ None (unless -B suffix present)
  • Shaft:​ Keyed, diam. typically 14–19 mm (check nameplate)
  • Mounting:​ NEMA face or metric pilot flange
  • Weight:​ ~13.6 kg (29 lb) for B-204-C class
  • Protection:​ IP65 (sealed bearings, shaft seal)
Construction & Materials:
  • Stator: Low-loss silicon steel laminations, Class H magnet wire
  • Rotor: Rare-earth (Samarium-Cobalt or Neodymium) magnets, dynamically balanced
  • Housing: Cast aluminum with fins for natural convection cooling
  • Connector: MS circular or terminal box (per option)
Installation & Notes:
  • Match drive DC bus voltage to motor winding (320 VDC for 230 VAC wound B-series; 565/680 VDC for BH 400 VAC versions).
  • Use resolver compensation tables in drive if using digital drive (S600/S700/AKD).
  • Check direction of rotation and phase matching (U-V-W) during first power-up in “align” or “lock rotor” mode.
  • Periodically inspect shaft seals and bearing lubrication in harsh environments.
Applications:​ Printing, converting, coil winding, packaging, web guiding, machine tool spindle/axis (legacy systems).

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