M21NRXB-LNN-NS-00

M21NRXB-LNN-NS-00 is a Pacific Scientific unit in the POWERMAX II M Motors series. It has an enhanced construction, a standard rotor, one stack, and a NEMA 23 frame with NEMA mounting. The B-type winding supports parallel, series, and unipolar phase currents of 4.6, 2.3, and 3.3 A, respectively. Corresponding phase inductance values are 1.0, 4.0, and 1.0 mH. Holding torque is 137 oz-in in parallel or series operation and 97 oz-in in unipolar operation, while detent torque is 9.4 oz-in.

The motor provides 200 steps per revolution through a 1.8-degree step angle, with step accuracy of ±1.5%. It has no feedback encoder, so external control determines commanded movement without integrated position feedback. The single shaft has a smooth, unmodified surface and a diameter of 0.2500 inches. It supports a maximum axial load of 13 lb and a maximum radial load of 20 lb.

The connection style is regular leadwire, and the connection arrangement uses a receptacle. Class B insulation is rated for 130ºC, while insulation resistance is 100 megohms and the insulation voltage rating is 340 VDC. These electrical insulation characteristics limit leakage and isolate energized windings. The operating temperature range is -20ºC to +40ºC, and thermal resistance is 5.5ºC/W for assessing temperature rise relative to dissipated power.