Product Description:

The T21NRLC-LNN-NS-00 is a two-phase step motor from Pacific Scientific that fits within the T High Torque Motors series. In automated indexers, pick-and-place heads, or small positioning tables, this motor converts digital pulse trains from a drive into incremental shaft rotation and steady holding capacity. Its compact frame allows installation in restricted enclosures while still delivering the step accuracy needed for repeatable motion sequences in industrial automation.

For electrical performance, the phase windings have a resistance of 42.9 ohms, which governs copper loss and influences driver voltage selection. Inductance is specified at 209 mH; this value shapes the current rise time, so it affects how quickly rated torque can be reached after each step command. Static detent torque of 0.021 N·m is present even when coils are unenergized and gives minimal passive holding against back-driving. When the coils are excited at the proper current, the motor develops a holding torque of 1.27 N·m, enabling precise load retention without mechanical brakes. The laminated stator and endbell package results in an overall motor width of 56.9 mm, a dimension important for mounting in linear stages or gantry axes where side-by-side clearance is limited.

Mechanical loading limits include a radial shaft capacity of 67 N and an axial limit of 111 N, allowing the shaft to carry moderate belt tensions or coupler overhangs without premature bearing wear. Each phase draws up to 0.4 A DC, so the drive electronics can be sized for low current outputs that minimize heat in compact control cabinets. Rotor inertia is only 0.000024 kg·m², giving fast acceleration and reduced settling time in high-speed step sequences. With a fundamental step angle of 1.8°, the motor offers 200 full steps per revolution, providing direct fine positioning without secondary gearing.