P21NSXS-LSS-NS-04 Pacific Scientific
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The Pacific Scientific P21NSXS-LSS-NS-04 is a stepper motor from the POWERMAX II P Motors series featuring a NEMA 23 frame size, standard construction, and a bearing diameter of 30 mm. It offers a step angle of 1.8 degrees with 200 steps per revolution, uses Neodymium-Iron-Boron rotor magnets, and has a phase count of 2. The motor has Class B insulation rated for 130°C and operates between -20°C and +40°C.
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Product Description:
The P21NSXS-LSS-NS-04 is a two-phase stepper motor built by Pacific Scientific for the POWERMAX II P Motors series. The unit converts discrete drive pulses into fixed angular motion, making it suitable for indexing tables, small axis stages, and other industrial automation tasks where reliable incremental positioning is needed. Two motor phases are energized in sequence by the drive through a receptacle on the rear shell.
With a frame size of NEMA 23, the motor uses a common 2.3-inch mounting footprint that simplifies interchangeability with other motion products. Its shaft rides on a 30 mm bearing diameter that supports radial loads and helps maintain concentricity. The rotor advances in fixed increments with a step angle of 1.8 degrees, yielding 200 full steps per revolution, and step accuracy is held to +/- 1.5 %. One stack is used in the magnetic circuit, the construction is standard, and the rotor is the standard type, giving predictable torque curves. The housing measures 2.25 inches across flats, and the NEMA mounting style keeps fastener locations consistent with the frame code.
The stator windings use Class B, 130°C insulation so the motor can withstand elevated internal temperatures while operating in ambient ranges from -20°C to +40°C. Electrical isolation is verified by an insulation resistance of 100 Megohms when tested at an insulation voltage of 340 Vdc, supporting safe operation on typical stepper drives. High-energy neodymium-iron-boron magnets are pressed into the rotor to maximize pull-in torque without increasing stack count. The connector receptacle allows quick cable removal, and the absence of an encoder means position is inferred from commanded steps rather than feedback. Standard construction materials and the 2.25-inch square housing give a compact envelope for tight panel layouts.
