Digital guide
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Kollmorgen B-204-C-99-S-2-46
Product Introduction: Kollmorgen “B” series frameless brushless motor kits (historically Goldline® BLM / ULT/ULT-true frameless). B-204 = frame size 204 (approx. bore & OD per Kollmorgen frameless dimension tables — typically ~200 mm outer diameter, ~70–100 mm ID depending on exact series). “C” = stator/rotor pair; “99” = custom winding/specification; “S” = shaft/hub config or special; “2-46” = stack length or magnet config. These are component-level kits, not housed motors.
Detailed content
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Key Characteristics (typical for B-204 class):
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Outer Diameter: ~203–210 mm (frame 204)
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Bore (Inner Diameter of Rotor): varies by model (~80–120 mm)
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Continuous Torque: can range 10–40+ Nm depending on stack/winding
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Peak Torque: 2–3× continuous
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Pole Pairs: typically 4–8 (depends on wind)
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Max Speed: 1000–4000 rpm (inverse to torque)
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Winding: Custom — check nameplate for Ke (V/krpm), Rphase, Lphase
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Magnet Material: NdFeB, high-coercivity grade
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Stator: Epoxy-impregnated copper windings, Class H insulation typical
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Working Principle: Three-phase sinusoidal BLDC/PMSM — requires external servo drive (e.g., AKD-P… sized to motor’s Icont/Ipeak and bus voltage) and separate bearings/housing provided by machine builder.
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Installation Requirements: Press-fit rotor magnet ring onto customer-supplied hub/shaft; bolt stator into machine housing; align air gap precisely (typically 0.3–0.8 mm) — misalignment causes cogging/overheating; provide thermal path from stator to machine structure; route phase leads with strain relief; terminate Hall/commutation sensors if equipped.
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Precautions: Frameless motors have NO built-in bearing or cooling — machine structure must support radial/axial loads; never run uncoupled from load-bearing structure; verify phasing with drive before applying full current; handle rotor magnets with care (strong magnetic field — keep ferrous debris away).
