Digital guide
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Kollmorgen B-402-B-21
Product Name: Goldline B-Series Brushless Servo Motor, 402 frame, B winding, 21 = feedback/option code
Product Introduction:
B-402-B-21 is a legacy Goldline permanent-magnet brushless servo motor. “402” = 4-inch-class frame, “B” = winding/stack variant giving mid torque, “21” = feedback and shaft configuration code.
Detailed content
Technical Specifications (EB-402 / B-402 class reference):
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Rated speed: 1500–3000 rpm (B-402-B typical 3000 rpm max)
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Continuous stall torque: ~6.8 N·m (40 °C), ~7.4 N·m (25 °C)
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Rated power: ~2.2 kW
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Voltage class: 230/400 V AC
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Insulation: F (155 °C)
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Feedback: incremental encoder std, resolver optional
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Protection: IP54 (typical Goldline)
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Frame: 4-in NEMA/IEC hybrid flange
Features: High torque at low speed, robust cast housing, thermistor protection, compatible with SERVOSTAR S300/CD drives.
Applications: Material handling, metal forming, extruder auxiliaries, warehouse cranes.
Precautions: Obsolete platform—spares via repair houses; commutation offset must be set when paired with non-Kollmorgen drive.
