Product Description:

The M-205-A-21 is a servo motor manufactured by Kollmorgen and assigned to the M Goldline Servo Motors series. In automated assembly lines, packaging equipment, and material handling cells, the unit converts commanded electrical current into precise rotary motion for positioning and velocity control. Its design allows direct coupling to screw drives or gear stages, forming the actuating element in closed-loop motion axes controlled by a matching digital amplifier.

At its continuous operating point, the motor delivers 0.82 kW of mechanical power while spinning at 1900 RPM. When the shaft is locked and the winding temperature is 40 °C, it can sustain 4.47 Nm of stall torque without exceeding thermal limits. This capability is associated with a thermal resistance of 0.74 °C/W and a 20-minute thermal time constant that indicates how quickly heat is conducted to the frame. Torque rises in proportion to current, as reflected by the constant of 1.66 Nm/A RMS. For short transients such as indexing moves, the electromagnetic circuit supports a peak output of 13.7 Nm, giving the machine additional torque for rapid acceleration.

The electrical design supports a surge current of 8.7 A RMS for dynamic events, while normal operation draws 2.7 A RMS from the drive. A back electromotive force constant of 100.5 VRMS/kRPM helps determine amplifier voltage margin and works with a winding inductance of 133 mH and a DC resistance of 9.46 Ω to shape current loop response. The windings are insulated for connection to supplies up to 250 VRMS, and the four-pole rotor has an inertia of 0.001143 kg·m², allowing rapid starts without excessive overshoot. Total mass is 7.3 kg, which provides thermal mass for stable running.