Product Description:

The M-403-A-21 is a brushless servo motor manufactured by Kollmorgen as part of the M Goldline Servo Motors series. This model is intended for closed-loop industrial drives where accurate torque and speed control are required to position loads, regulate web tension, or synchronize multi-axis assemblies. Integrated thermal sensing and a shaft-end resolver interface allow the motor to be paired with digital amplifiers so that motion controllers can track command profiles without losing positional fidelity during production cycles.

Under continuous operation, the motor can deliver 6.8 N-m of stall torque while limiting the phase current to 3 A RMS, a level suited for medium-inertia loads that must hold steady against process forces. When the stator windings are energized to reach the rated velocity of 1500 RPM, the 0.97 kW power rating is achieved without exceeding a winding temperature rise of 40 °C. The torque constant of 2.51 N-m/A RMS links commanded current to produced torque, simplifying drive tuning because a linear relationship exists across the working range. Electrical responsiveness is influenced by an armature inductance of 220 mH; this comparatively high value filters rapid current spikes, reducing conducted EMI but demanding higher voltage during step changes.

For short transients, the motor withstands a peak stall torque of 19.8 N-m when the drive supplies up to 9.3 A RMS, providing headroom for acceleration or shock loading without saturation. The back-emf coefficient of 136.0 VRMS/kRPM indicates the voltage that the drive must overcome at top speed, a consideration when sizing DC bus supplies. Dynamic behavior is aided by a rotor inertia of 0.00259 kg-m², giving fast response while remaining high enough to damp velocity ripple. A shaft seal rated at IP65 protects the bearings from coolant spray and airborne particulates, while an internal thermostat that opens at 170 °C and recloses at 132 °C provides over-temperature signaling to the drive.