Product Description:

The T21NRLH-LNS-NS-03 is a hybrid stepper motor manufactured by Pacific Scientific as part of the T High Torque Motors series. Designed for precise incremental motion in industrial automation, it converts digital drive pulses into controlled shaft rotation for indexing tables, small gantries, and automated dispensers. Its frame dimensions follow a common mounting standard, allowing straightforward integration into existing mechanical layouts. Because motion is generated in discrete steps, the drive can command repeatable starts, stops, and short indexing moves with simple pulse sequences. The motor also supports static load holding in open-loop systems where repeatable step positioning is more important than continuous servo regulation.

The motor uses a NEMA 23 frame, so the mounting pilot and bolt pattern line up with standard 57 mm square brackets. Each full electrical cycle advances the rotor by 1.8°, giving 200 discrete steps per revolution and allowing fine incremental motion in rotary or linear mechanisms. The winding is arranged in 2 phases, which allows full-step, half-step, or microstep drive methods depending on the balance needed between smoothness and positional accuracy. That flexibility can help reduce resonance and audible vibration at low speed. At a rated excitation of 2.7 A DC per phase, the motor develops a nominal holding torque of 1.27 N·m, which is suitable for maintaining position against moderate static loads without a mechanical brake.

The dynamic behavior is influenced by a rotor inertia of 0.000024 kg·m², which supports quick acceleration while still helping smooth torque ripple from discrete stepping. Electrical response is set by a phase inductance of 4.6 mH, so current rise becomes more gradual as step rates increase, and drive voltage selection remains important for higher-speed operation. In practical use, inertia, inductance, and external load all influence how quickly the motor can accelerate to its target step rate without losing synchronism. The shaft can absorb an axial load up to 111 N and a radial load of 67 N without exceeding rated bearing life. Those load limits allow direct support of couplings, pulleys, or light pinion gears when the motor is integrated into compact motion assemblies.