Product Description:

The N12M4LRT is a frameless brush DC motor manufactured by Kollmorgen and supplied under the ServoDisc Pancake DC Motors series. Its thin axial design minimizes shaft length, allowing direct coupling to precision stages, indexing tables, or compact gearheads where space is limited. Within industrial automation, the unit delivers bidirectional torque under closed-loop control, serving positioning axes that require quick speed transitions and repeatable accuracy.

The motor reaches nominal performance when its windings are energized at 23.0 V. At this operating voltage, it draws a steady 15.00 A, yielding a continuous shaft torque of 115 oz-in at the 25 °C reference temperature. Under these conditions, the armature can sustain a running speed of 3000 rpm. Mechanical power output equals 256 W, aligning the device with mid-range servo drives commonly used on pick-and-place gantries. A back electromotive-force constant of 6.60 V/KRPM indicates the feedback voltage produced by the rotating armature, which drive amplifiers use to monitor actual velocity. Terminal resistance is 0.310 Ω, so the controller must accommodate the corresponding current rise during acceleration while observing the thermal resistance at stall of 1.90 °C/W.

Dynamic overload capability includes a peak torque of 1320 oz-in; achieving this level requires momentary currents up to 159 A, giving the axis additional capacity for rapid start-stop cycles or overcoming static friction in vertical loads. The torque constant of 8.90 oz-in/A links the current command directly to magnetic output, simplifying current-mode loop tuning. Fast response is further supported by a mechanical time constant of 7.70 ms, indicating that the rotor accelerates to 63% of a speed step within eight milliseconds, while a low inertia of 0.0260 oz-in-s² limits energy storage and assists in precise trajectory tracking.