Product Description:

The LSM75-21-602-M-OKA is a brushless servo motor manufactured by Kollmorgen as part of the LSM Brushless Servo Motors series. This low-inertia unit is designed to deliver tightly regulated motion in packaging lines, pick-and-place robots, and other closed-loop axes that rely on high-resolution feedback. It uses electronically switched three-phase power to energize the stator windings and generate rotor torque while keeping heat rise manageable for continuous industrial duty.

Its continuous torque output is 2.36 Nm, enabling steady acceleration of moderate loads without thermal derating. When rapid indexing or transient disturbances occur, the motor can reach a peak torque of 8.8 Nm for short intervals. The magnetic circuit uses an eight-pole rotor and supports sinusoidal commutation up to a rated speed of 6000 rpm, after which back EMF limits additional speed range. Supplying that performance requires a drive capable of delivering 21.6 A peak during short bursts, while normal stall conditions draw 5.5 A peak. The motor can also handle up to 24 kg of radial load at full rated speed, which helps protect the shaft and bearings during operation.

The motor’s reflected inertia is only 0.000033 kg-m², allowing high loop bandwidth when paired with stiff mechanics. Electrical response is shaped by a phase inductance of 17.9 mH and a winding resistance of 2.26 Ω at 25 °C, which affects current rise time and drive amplifier selection. In the 230 V class, the windings produce a back EMF of 49 V/kRPM, matching the servo drive voltage margin while maintaining insulation integrity. Each ampere of phase current generates 0.42 Nm/A, so torque can be predicted from current feedback with minimal calibration. A multi-turn high-resolution encoder provides absolute position data to the controller, and the steel shaft transmits motion with minimal torsional compliance.