Product Description:

The LSM75-21-602-S-OKA is a brushless servo motor manufactured by Kollmorgen within the LSM Brushless Servo Motors series. Designed for precision motion in assembly stations, robots, and light machining centers, the motor converts drive current to mechanical rotation with minimal cogging. It is supplied without a brake, allowing free back-driving when power is removed, and uses a keyway shaft so couplings can be secured without slip.

Under nominal conditions the motor delivers a continuous torque of 2.36 Nm, giving machines steady force for prolonged duty cycles. During acceleration or rapid indexing it can reach a peak of 8.8 Nm, provided the drive can supply up to 21.6 A of phase current. The winding constant is 0.42 Nm/A, so each ampere contributes proportionally to output torque, while the rated supply of 230 VAC matches common industrial mains. Speed regulation extends to 6000 RPM before mechanical limits are reached; at that top velocity the allowable radial bearing load is 24 kg and no axial load is permitted, protecting the bearing set. A stall current of 5.5 A sets the continuous thermal limit during locked-rotor tests.

Electrical and inertial parameters characterize how the motor interfaces with a servo amplifier. The back-EMF slope is 49 V/kRPM, informing the required DC-bus voltage as speed rises. Coil behavior reflects a phase-to-phase inductance of 17.9 mH and a resistance of 2.26 Ω at 25 °C, values that the drive uses when setting current loops and thermal models. With a rotor inertia of 0.00003 kg·m², the axis can accelerate rapidly and settle quickly, a behavior supported by high-resolution sin/cos feedback that provides fine positional data to the controller. Because the motor lacks an internal brake, holding torque must be provided electrically whenever static positioning is needed.