Product Description:

The H21NRFA-LNN-NS-00 is a hybrid stepper motor manufactured by Kollmorgen as part of the H Hybrid Motors series. It delivers incremental motion for positioning jigs, light conveyors, and small actuators where closed-loop feedback is not required. This type of motor is commonly paired with open-loop drive electronics that command movement by counting input pulses. Electrical connections use a regular lead-wire connection style, and the motor has no internal feedback device, which keeps the control interface simple. Standard construction combines a NEMA mounting flange with a single-stack laminated rotor, giving the motor a familiar footprint for compact machine layouts. A smooth shaft is provided without a shaft seal, so external guarding is advisable where airborne contaminants or liquids are present.

The motor has a frame diameter of 2.25 in and matches the widely used NEMA 23 frame size found in laboratory and light-industrial equipment. Windings are insulated to Class B 130 °C, supporting stable thermal operation when ambient conditions vary during normal use. Electrical insulation is supported by an insulation resistance of 100 Megohms and a voltage rating of 340 Vdc, which helps limit leakage current when the drive uses a higher DC bus. Eight lead wires exit the housing so the windings can be connected in series or parallel. That flexibility lets the motor support applications that favor either stronger low-speed torque or improved high-speed winding behavior. The lead-wire format also supports straightforward integration with common stepper drive connections.

A basic step angle of 1.8 degrees produces 200 discrete steps per shaft turn, enabling accurate indexing without optical encoders. Positioning repeatability remains within ± 1.5 % of a commanded move, which suits feeders, small gantries, and other axes that rely on repeatable incremental positioning. The step format supports straightforward indexing, dwell positioning, and short transfer motions in compact automation assemblies. Continuous service is supported across an ambient range of -20 °C to +40 °C, so the motor can operate in chilled areas as well as moderately heated enclosures. This operating profile is appropriate for general-purpose motion tasks that need predictable step response rather than integrated feedback hardware.