M21NRXB-LSS-NS-08 Pacific Scientific
Wake Industrial LLC is not an authorized distributor of this product.
The Pacific Scientific M21NRXB-LSS-NS-08 is a stepper motor in the POWERMAX II M Motors series with enhanced construction and a NEMA 23 frame size. It offers a holding torque of 0.97 Newton-meters and operates with 2 phases and a step angle of 1.8 degrees, providing 200 steps per revolution. The motor features a regular leadwire connection style and functions reliably in temperatures ranging from -20°C to +40°C.
Internal Product Review
The M21NRXB-LSS-NS-08 is a Pacific Scientific POWERMAX II M stepper motor with a NEMA 23 frame size and 2-phase design. A 1.8-degree step angle and ±1.5% step accuracy support precise positioning and clean indexing in motion applications. Holding torque of 0.97 N·m gives the motor impressive low-speed authority.
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Product Description:
The M21NRXB-LSS-NS-08 is a stepper motor manufactured by Pacific Scientific for the POWERMAX II M Motors series. It converts pulse commands into fixed angular movement for open-loop positioning in industrial automation. This operating method makes it suitable for indexing, feed control, and other motion tasks that need repeatable movement without a separate feedback device. Because the motor runs without an encoder, the control system relies on commanded steps rather than measured position, which keeps the motion scheme simple.
With a parallel winding, the motor draws 4.6 A DC per phase, while a series connection lowers the current to 2.3 A DC for higher-impedance drives. The rated holding torque of 0.97 N·m supports static loads, and a 0.066 N·m detent torque reduces drag when the motor is de-energized. A NEMA 23 frame with a matching NEMA face mount fits common 57 mm machinery, and each electrical step advances the shaft by 1.8 degrees, which gives 200 positions per revolution. The motor uses a single-stack, two-phase type B winding with a regular lead-wire connection style, and the winding has an inductance of 1.0 mH in parallel and 3.9 mH in series. This arrangement keeps the package compact and supports two-phase operation.
Electrical insulation uses a Class B 130 °C system with 100 megohms of insulation resistance, and the motor withstands 340 Vdc during dielectric testing. The parallel circuit has a resistance of 0.32 Ω, while the series path rises to 1.26 Ω to suit different drive connections. Continuous duty is permitted from −20 °C to +40 °C, and a rear receptacle provides the single detachable connection point for cabling in tighter installations. Standard rotor geometry works with the enhanced stator to keep positional error within a ±1.5 % step accuracy band. These electrical values support stable phase energizing when the motor is matched to the appropriate drive connection.
