P21NSSD-JSS-NS-02 Pacific Scientific
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The Pacific Scientific P21NSSD-JSS-NS-02 is a stepper motor in the POWERMAX II P Motors series with a NEMA 23 frame size and standard construction, featuring a 1.8 degree step angle and 200 steps per revolution. It has Class B insulation rated for 130°C and an operating temperature range from -20°C to +40°C. The motor uses a low inertia rotor, supports two phases, and offers a mounting style with four mounting holes on a 66.67 mm bolt circle.
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Product Description:
The P21NSSD-JSS-NS-02 is a two-phase hybrid stepper motor manufactured by Pacific Scientific within the POWERMAX II P Motors series. In automated equipment, this motor transforms pulse sequences from a drive into incremental shaft movement, providing controlled positioning for feeders, small gantries, and indexing tables where brushed servomotors are unnecessary. Its compact body simplifies machine layouts in multi-axis systems while preserving space for nearby components and wiring.
It uses the industry-standard NEMA 23 frame, so it fits directly onto modular gearboxes and mounting plates without custom adapters. Each command pulse advances the rotor by 1.8 degrees, producing 200 full steps per revolution for straightforward microstepping ratios. The single-stack magnetic circuit and low-mass rotor yield an inertia of only 0.000008 kg·m², allowing fast acceleration with limited drive current. Positional repeatability is maintained within ± 1.5%, which is adequate for pick-and-place payloads and light conveyors. The stator phases are driven in sequence according to winding code D to create the rotating field pattern. No feedback device is present, so the controller must keep commanded motion within the motor’s available torque limits to prevent missed steps.
Thermal and dielectric margins support operation at ambient temperatures from -20 °C to +40 °C, while the windings use Class B insulation rated for 130 °C to tolerate internal temperature rise during continuous operation. The coil system withstands line-to-case potentials up to 340 VDC and exhibits an insulation resistance of 100 MΩ, helping control leakage between energized windings and the housing. A four-hole NEMA flange has a bolt-circle diameter of 66.67 mm and uses holes measuring 5.08 mm in diameter, allowing the motor to be secured to panels or actuators without additional brackets.
