M21NRXC-JNN-NS-00 Pacific Scientific
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The Pacific Scientific M21NRXC-JNN-NS-00 is a stepper motor from the POWERMAX II M Motors series. It features a NEMA 23 frame size, has a single smooth shaft with a 6.35 mm diameter, and supports an axial shaft load of 13 pounds. The motor operates at a step angle of 1.8 degrees with 200 steps per revolution and delivers a parallel hold torque of 142 oz-in.
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Product Description:
The M21NRXC-JNN-NS-00 is a two-phase stepper motor built by Pacific Scientific as part of the POWERMAX II M Motors series. It delivers 200 discrete steps per revolution for incremental positioning in pick-and-place stations, light conveyor indexing, and metering pumps. The motor is supplied with a regular leadwire connection style, is mounted to NEMA dimensions, and uses a single receptacle for power. An enhanced construction with a low-inertia rotor minimizes settling time, while a C-type winding and a single magnetic stack support the intended torque profile. No feedback device is fitted, so position verification must be handled by the motion controller. This arrangement is suited to open-loop motion tasks where repeatable indexing is required without a separate motor-mounted feedback channel.
The motor fits the NEMA 23 frame and measures 52.3 mm in body length, making it suitable for compact drive axes. A smooth, single shaft of 6.35 mm diameter aligns with couplings without secondary machining. Each full step spans 1.8 degrees, giving the controller predictable 200-step resolution, and accuracy stays within ±1.5%. Electrically, the parallel winding draws 3.5 A per phase, has 0.56 Ω of resistance, and has 2.0 mH of inductance, which affect current rise time and heat generation. The two phases share a thermal resistance of 5.5 °C/W, helping the stator transfer losses to ambient air during continuous operation.
Under continuous excitation, the parallel circuit develops 142 oz-in of holding torque, while a unipolar drive can obtain 100 oz-in when lower current is preferred. The 6 mm bearings permit a 20 lb radial load and a 13 lb axial load on the shaft, supporting moderate belt tension or gear overhung loads. The permitted ambient range is -20 °C to +40 °C, and the insulation system is rated Class B, 130 °C. Insulation resistance is 100 megohms at 25 °C, and dielectric strength is verified to 340 Vdc. Total mass is 0.68 kg, which helps keep moving loads low in gantry axes and other compact indexing mechanisms.
