LSM34N-21-602-E2-0KA Kollmorgen
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The Kollmorgen LSM34N-21-602-E2-0KA motor is part of the LSM Brushless Servo Motors series. It delivers a continuous torque of 21 lb-in, a peak torque of 78 lb-in, and can reach speeds up to 6000 rpm. The motor has a steel shaft, weighs 3.1 kg, and features a 2000-line incremental feedback type.
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Product Description:
The LSM34N-21-602-E2-0KA is built by Kollmorgen within the LSM Brushless Servo Motors series. The motor serves as an electromechanical drive element that delivers controlled torque and speed to index tables, Cartesian robots, and other motion axes in industrial automation. The 148 mm body length fits compactly behind machine guards, and the steel shaft transmits torque directly to belt pulleys or couplings.
Under continuous load, the motor sustains 21 lb-in of torque, providing steady rotary force for duty cycles that demand accurate holding and smooth motion. During acceleration, it can generate 78 lb-in of peak output, so bursts of high load do not stall the axis. Shaft velocity rises to 6000 rpm, enabling high throughput when the motor is coupled to low-ratio gearheads. During startup, the drive may draw a peak stall current of 5.5 A; at maximum output, phase demand can reach 21.6 A peak. An eight-pole rotor and a reflected inertia of 0.000033 kg·m² let the drive respond quickly without overshoot. A 2000-line incremental encoder supplies pulse feedback so the controller can close position and velocity loops with fine resolution.
The stator windings are energized from a 230 VAC bus, and each ampere generates torque according to a constant of 0.42 Nm/A, allowing the controller to predict load response from commanded current. Back EMF rises linearly with speed at 49 V/kRPM, which the drive uses for field-oriented control and overvoltage protection. Magnetic energy storage in the coils is governed by an inductance of 17.9 mH, while the copper resistance is 2.26 ohms; together, these values set electrical time constants and limit ripple current. The assembly weighs 3.1 kg, which simplifies mounting on gantry axes without adding excessive moving mass. All feedback pulses exit through a single connector, minimizing wiring. The motor pairs with Kollmorgen digital amplifiers sized for the stated current and voltage limits.
