M-105-B-21 Kollmorgen
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The Kollmorgen M-105-B-21 is part of the M Goldline Servo Motors series and has a weight of 4.1 kg. It features a continuous stall torque of 1.57 N·m and a peak stall torque of 4.45 N·m. The motor has a back emf constant of 22.5 Vrms per kRPM and a thermal resistance of 1.07 degrees Celsius per Watt.
Internal Product Review
The M-105-B-21 is a Kollmorgen M Goldline servo motor with 1.57 N·m continuous stall torque at 4.2 Arms. A torque constant of 0.37 N·m/Arms and 4.45 N·m peak stall torque support strong dynamic response in precise motion applications. This motor stands out as a well-balanced choice for servo axes requiring stable torque production and dependable tuning characteristics.
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Product Description:
The M-105-B-21 is a brushless servo motor produced by Kollmorgen within the M Goldline Servo Motors series. It functions as an electromechanical actuator that converts regulated current from a matched drive into precise rotary motion, enabling closed-loop control of machine tools, conveyors, and automated handling stations. This model is suitable for applications that require moderate torque, compact frame dimensions, and accurate positioning. Its brushless design supports responsive speed and position control during repetitive industrial motion.
At standstill, the motor can deliver a continuous torque of 1.57 N·m while drawing 4.2 Arms, supporting indefinite holding duty within its thermal limit. When rapid acceleration is needed, current may rise to 12.6 Arms, and torque peaks at 4.45 N·m, allowing short bursts that overcome inertial loads. The back electromotive force constant is 22.5 Vrms/kRPM, so the drive must supply proportionally higher voltage as speed increases to maintain current. Electrical losses are governed by the 2.72 Ω winding resistance, while a static friction value of 0.05 N·m indicates the breakaway threshold. With a four-pole rotor and a torque constant of 0.37 N·m/Arms, commanded current produces predictable shaft output.
Dynamic response is influenced by the stator inductance of 14.4 mH; lower inductance reduces current rise time, so the drive’s PWM frequency must be selected accordingly. The rotor inertia of 0.000338 kg·m² balances quick reversal with load matching, while viscous damping of 0.003 N·m/kRPM adds predictable speed-proportional drag for stable servo loops. Heat generated during operation is removed through a thermal path rated at 1.07 °C/W, and the housing reaches thermal equilibrium in approximately 11 min. These values support overload prediction by the drive during changing duty cycles. The assembly weighs 4.1 kg, providing a favorable torque-to-mass ratio for gantry axes and articulated joints.
