Product Description:

The M-105-A-21 is a brushless permanent-magnet servo motor built by Kollmorgen for the M Goldline Servo Motors series. In industrial automation, this motor serves as the prime mover in high-speed indexing tables, electronic assembly robots, and packaging spindles that require accurate velocity and torque control. By converting electrical energy from a matched servo drive into controlled mechanical rotation, it provides the responsiveness needed for coordinated multi-axis motion in production cells. Its compact frame allows direct integration into tight enclosures while still delivering continuous torque over the full duty cycle.

Under continuous load, the motor draws 3.0 A RMS and produces a stall torque of 1.64 N-m at 25 °C, providing a baseline for static holding requirements. At the rated operating point of 0.90 kW mechanical output and a shaft speed of 5600 RPM, efficiency is influenced by a DC resistance of 5.30 Ω and an inductance of 28.1 mH that affect current rise time. The motor has a torque constant of 0.51 N-m/A RMS, so each ampere commanded by the drive produces proportional torque. These values support drive sizing, cable selection, and thermal checks during system integration.

Dynamic operation is supported by a peak torque capacity of 4.38 N-m, which can be delivered when the drive supplies up to 9 A RMS for rapid acceleration or disturbance rejection. Back electromotive force is rated at 31 VRMS/kRPM, which provides a basis for voltage sizing in the servo amplifier. The rotor has a moment of inertia of 0.000338 kg-m², enabling fast speed changes with controlled response. Thermal resistance of 1.07 °C/W and a weight of 4.1 kg affect temperature rise and mounting support requirements. A rear shaft extension is available for auxiliary encoders or brakes, and the bayonet connection simplifies attachment without separate plugs.