Product Description:

The E21NRFA-JNN-NS-00 is a hybrid stepper motor produced by Kollmorgen within the E Hybrid Stepper Motors series. This motor combines permanent-magnet and variable-reluctance principles to generate incremental torque for indexers, small gantries, and packaging axes that require open-loop positioning. It follows the NEMA mounting convention, allowing integration into motion frames designed for compatible stepper hardware.

The cylindrical housing measures 2.25 in in diameter and corresponds to a NEMA 23 frame, so the front-face bolt circle matches common stepper gearboxes. Internal torque production is enhanced by SIGMAX construction, which concentrates magnetic flux in the stator teeth. Each electrical pulse advances the shaft by 1.8 degrees, providing a native resolution of 200 steps per revolution for precise incremental moves without microstepping. The design employs a single rotor stack and low-inertia laminations. An eight-lead wiring harness supports either a series or parallel phase connection through the standard lead-wire pigtail. A smooth, ungrooved shaft transmits motion, and the absence of a shaft seal simplifies installation in dry enclosures.

Thermal integrity is maintained by Class B insulation rated to 130 °C, while an insulation resistance of 100 megohms at room temperature limits leakage current between the windings and frame. The windings have a dielectric withstand voltage of up to 340 VDC. The allowable ambient temperature range of -20 °C to +40 °C supports operation in unconditioned machinery spaces. Step accuracy remains within ±1.5%, and the low-inertia rotor minimizes settling time during rapid indexing cycles. Because no encoder is fitted, the motion controller must count commanded pulses to determine the motor’s position. The motor is supplied without a holding brake, so stationary load retention must be provided by phase current or an external mechanism.