NSM4220 Kollmorgen
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MPN: M.1015.6960
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The Kollmorgen NSM4220 is a brushless servo motor from the NSM Brushless Servo Motors series. It provides a continuous torque of 2.5 Nm and a peak torque of 7.1 Nm. The motor has a back EMF constant of 34 V per kRPM and weighs 5.9 kilograms with a rotor inertia of 0.00035 kg-m².
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Product Description:
The NSM4220 is a brushless servo motor produced by Kollmorgen within the NSM Brushless Servo Motors series. Designed for closed-loop positioning and velocity tasks, the unit converts drive current into controlled shaft torque for pick-and-place gantries, indexing tables, and similar automation axes. It integrates with Kollmorgen digital amplifiers through resolver feedback, enabling precise motion control in compact machinery. Pairing the motor with a compatible servo drive provides responsive acceleration and accurate regulation of shaft position, speed, and torque. The brushless design eliminates mechanical commutation components, reducing wear during repetitive motion cycles.
The motor provides a continuous stall torque of 2.5 Nm, allowing the shaft to hold a load steadily during dwell periods. For rapid moves, peak torque rises to 7.1 Nm, providing additional capacity for brief acceleration demands before thermal limits are reached. The motor has a torque constant of 0.28 Nm/A, so each ampere delivered by the drive produces slightly more than one-quarter newton-meter of torque. Generated back voltage increases with speed at 34 V/krpm, allowing the drive to account for the required commutation voltage at a given velocity. Copper losses are influenced by a phase resistance of 0.77 Ω, which affects current limiting and heat generation during continuous operation. These electrical characteristics support controlled torque production across changing speed and load conditions.
The phase inductance of 2.9 mH helps filter current ripple, supporting high-bandwidth control without requiring excessive switching frequency. A rotor inertia of 0.00035 kg-m² allows the axis to change speed quickly and respond effectively to drive commands. The bearing design supports radial side loads up to 52 kg at 1,000 rpm, allowing direct connection to suitable belt pulleys or pinions. At 3,000 rpm, the supported radial side load is 36 kg. The motor has a mass of 5.9 kg, balancing thermal capacity with a frame that can be installed on moving carriages. Its mass must be considered when sizing the supporting linear stage and calculating the total moving load of the axis.
