M-205-B-33 Kollmorgen
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The Kollmorgen M-205-B-33 is part of the M Goldline Servo Motors series, delivering a rated torque of 4.24 N-m and a peak stall torque of 14 N-m. This servo motor provides a rated power output of 800 W at 115 Vac and 1600 W at 230 Vac, with maximum speeds of 1800 RPM and 3600 RPM respectively. It features a continuous stall current of 5.8 Arms, a torque constant of 0.848 N-m/Arms, and a rotor inertia of 0.00114 kg-m2.
Internal Product Review
The M-205-B-33 is a Kollmorgen M Goldline servo motor with 4.47 N-m continuous stall torque and 14 N-m peak stall torque. Rated power reaches 1600 W at 230 Vac, and maximum speed extends to 3600 RPM for strong axis performance. Excellent torque density and stable electrical characteristics make this motor a very capable choice for demanding motion applications.
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Product Description:
The M-205-B-33 is a brushless AC servo motor manufactured by Kollmorgen within the M Goldline Servo Motors series. Designed for closed-loop motion systems, this motor converts drive current into tightly regulated shaft torque, allowing packaging machines, gantry axes, and automated assembly stations to position loads with repeatable accuracy. Its electromagnetic design balances continuous torque production with thermal limits, supporting stable, high-performance motion without requiring an oversized drivetrain. It pairs with Kollmorgen drives and settles quickly after command changes.
At standstill, the motor draws a continuous phase current of 5.8 Arms, producing a sustained torque of 4.47 N-m without exceeding its allowable winding temperature. The motor has a torque constant of 0.848 N-m/Arms, which simplifies drive current scaling. Electrical behavior is further characterized by a phase inductance of 38 mH and a DC resistance of 2.48 Ω; together, these parameters determine the electrical time constant and influence servo loop bandwidth. A back-EMF constant of 51.2 Vrms/kRPM indicates the voltage generated per unit of speed. When supplied with 115 VAC, the motor reaches a base speed of 1800 rpm and can deliver 800 W while maintaining a rated torque of 4.24 N-m.
For short-duration events, the winding can tolerate a peak current of 17.4 Arms, resulting in a maximum torque surge of 14 N-m for rapid acceleration or disturbance rejection. Operation with 230 VAC raises the mechanical output capability to 1600 W and increases the top speed to 3600 rpm, extending the usable power band for high-speed indexing. The rotor has a moment of inertia of 0.00114 kg-m², which is low enough to support fast reversals yet high enough to smooth load disturbances. Thermal behavior is characterized by a thermal resistance of 0.73 °C/W and a thermal time constant of 21 minutes. The gradual temperature rise during intermittent overloads allows operating cycles that take advantage of the motor’s short-term stall capabilities.
