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