Product Description:

The M21NRXA-JDS-NS-02 is a hybrid stepper motor produced by Pacific Scientific within the POWERMAX II M Motors series. Built to deliver incremental motion without closed-loop sensors, it uses the manufacturer’s A-code winding in an enhanced single-stack construction. By energizing its windings in sequence, the motor generates discrete rotor positions for pick-and-place heads, small indexing tables, and other automation axes that require repeatable positioning. It is configured for open-loop operation with no integral feedback, while still allowing external couplings or encoders when the application requires them.

Mechanical compliance with the NEMA 23 frame standard gives the motor a front-face size that matches common gearboxes and mounting hardware. Each electrical step advances the rotor by 1.8 degrees, so one full rotation contains 200 addressable positions. The windings use Class B, 130 °C insulation, supported by 100 megohms of resistance and a 340 Vdc dielectric rating to help limit leakage and electrical breakdown. The operating temperature range is -20 °C to +40 °C, which allows installation in non-conditioned cabinets. Its single-stack layout, two-phase design, and A-type winding help keep inductance lower so the rotor can respond quickly to microstep current changes.

Mounting and mechanical alignment are guided by the housing dimensions. The body measures 57.10 mm across the flats, and the pilot diameter is 38.10 mm for accurate centering at the mounting face. Four 5.080 mm holes on a 66.670 mm bolt circle in the NEMA pattern secure the motor to a machine plate, and the 52.3 mm body length helps it fit into compact spaces. A low inertia rotor helps reduce settling time, while step accuracy is rated at ±1.5% for consistent positioning. The motor also uses a double shaft for coupler or handwheel attachment, and regular leadwires exit through a receptacle for straightforward field wiring.