Product Description:

The H21NRFT-LNN-NS-00 is a stepper motor produced by Kollmorgen within the H Hybrid Motors series. Built for open-loop positioning tasks in industrial automation, the unit converts indexed drive signals into repeatable angular increments so that actuators, tables, or meters move to defined points without external feedback. The motor mounts with the NEMA pattern and uses a lead-wire interface, enabling quick wiring to micro-stepping drives in conveyors, filling systems, and small servo presses. This arrangement suits compact machine stations that rely on predictable step counts during repeated indexing.

Its frame size is NEMA 23, giving a 2.3-inch square mounting face, while the laminated stator housing holds a rotor with an outside diameter of 2.25 in. Eight discrete coils terminate in an 8-lead bundle, allowing the windings to be connected in series or parallel for either higher torque or reduced inductance. Each electrical pulse advances the shaft by 1.8 degrees, and a full sequence yields 200 mechanical steps per revolution, a resolution suited for metering valves or print heads that need sub-millimeter repeatability. Step accuracy is held within ±1.5%, and the single-stack construction keeps detent torque moderate for smoother micro-step performance at low speed.

Electrical insulation is rated at 100 megohms to minimize leakage current, and the windings withstand up to 340 VDC without breakdown. The insulation system is rated Class B 130 °C, allowing continuous operation until conductor temperature approaches that limit. Ambient service is permitted from -20 °C to +40 °C, covering most enclosed machines without supplementary cooling. A smooth single shaft eases coupling to belts or gears, and the lack of a shaft seal is acceptable when the motor is installed in clean enclosures. With no encoder feedback, the design remains simple, and its standard construction keeps mass low for rapid acceleration in pick-and-place axes and other light indexing applications.