Product Description:

The H21NREB-TNN-NS-00 is a hybrid stepper motor from Kollmorgen that belongs to the H Hybrid Motors series. Designed for closed-loop or open-loop positioning, it converts command pulses from a drive into incremental rotary motion for pick-and-place stations, indexing tables, and other industrial automation axes. The device combines the magnetic detent characteristics of permanent-magnet technology with variable-reluctance stepping to provide precise holding at standstill, giving machine builders a compact actuator for standard mounting interfaces.

Mechanical integration centers on the NEMA 23 frame, so the motor shares bolt-circle and pilot dimensions common to many motion platforms. The windings use Class B insulation rated for 130 °C, providing thermal headroom for continuous current without premature dielectric breakdown. Insulation resistance remains above 100 megohms to minimize electrical leakage paths. The insulation system has a dielectric withstand rating of 340 VDC, helping it tolerate voltage spikes that can occur when drives apply rapid current changes. Six conductors exit through a six-lead wire bundle, allowing either unipolar or bipolar drive topologies without internal retermination. The electrical and magnetic laminations are arranged in a single stack, and the standard housing bolts directly to the corresponding machine flange. Continuous operation is permitted from -20 °C to +40 °C, supporting use in unconditioned plant areas while winding temperatures remain within the insulation limit.

The motor advances by 1.8 degrees per full step, yielding 200 discrete positions per shaft revolution for gearless linear stages or directly coupled lead screws. Its shaft has a smooth cylindrical surface that accommodates press-fit or clamp-style hubs without requiring a keyed coupling. Positional accuracy remains within ±1.5% of one full step, helping limit accumulated positioning error over repeated revolutions. Microstepping can provide finer commanded motion when the connected drive supports subdivided current control, while the motor’s holding behavior helps maintain the commanded position when movement stops.