Digital guide
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Kollmorgen M-403-A-21
Product Type: Direct-drive rotary (DDR/torque motor) module, M-series frameless/housed
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Product Name: M-403-A-21 direct-drive rotary motor
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Decode: M = direct-drive family, 403 = frame size with large hollow bore, A = winding A (low-voltage high-torque), 21 = stack/config.
Detailed content
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Performance (M403 class):
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Continuous torque 20–40 Nm
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Peak torque 80–120 Nm
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Speed 200–600 rpm
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Hollow shaft 40–50 mm pass-through
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Poles 18–24
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Construction:
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Outer rotor with NdFeB magnets, stator with water-cooling grooves optional
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Frameless version has no bearings; housed version includes bearings and encoder mount
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Lamination stack low-loss steel
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Working Principle: Torque motor eliminates gearbox; drive closes position loop on external encoder mounted to load.
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Application: Rotary index tables, telescope azimuth, test rigs, semiconductor turnstile.
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Install: Stator bolted to subplate, rotor aligned to load <0.05 mm TIR; thermal pad if liquid-cooled.
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Caution: High inertia ratio handled by controller; no mechanical reduction means backlash zero but tuning conservative.
