Product Description:

Kollmorgen’s E21NRFT-LNN-NS-00 belongs to the E Hybrid Stepper Motors series and is intended for open-loop positioning in pick-and-place heads, index tables, and light machine axes. The single-stack rotor and SIGMAX magnetic path produce discrete torque pulses each time the stator windings are energized. This allows a motion controller to convert clock signals directly into shaft rotation without requiring feedback devices. The operating method suits applications that need simple drive control and repeatable indexing during low-speed motion.

The motor follows NEMA mounting practice with a frame size of NEMA 23 and a circular housing diameter of 2.25 in. Each electrical pulse advances the laminated rotor by 1.8 degrees, yielding 200 steps per revolution and a positioning tolerance of ± 1.5 %. A single stack keeps the overall length modest while maintaining torque density for low-speed applications. Power is coupled through an 8-lead regular lead-wire harness that supports series or parallel phase hookups, giving flexibility when matching the motor to a suitable drive. The NEMA flange allows straightforward attachment to gearboxes or motor brackets, and mechanical output leaves the housing through a single smooth shaft. No shaft seal is provided, so external protection is required if fluids or dust are present.

An insulation system rated Class B withstands winding temperatures up to 130 °C, backed by an insulation resistance of 100 Megohms when tested at room conditions and a dielectric withstand capability of 340 Vdc. The design is passive, so no feedback sensor is fitted and position is inferred from the commanded step count. Continuous service is supported at ambient temperatures of −20 °C to +40 °C, and beyond this range the thermal rise must be checked against the insulation limit. Regular lead wires carry eight separate coil ends to the drive, and the lack of a shaft seal and feedback device limits the motor to clean, dry environments where enclosure sealing is handled by the host machine.