M21NRXC-JNN-NS-02 Pacific Scientific
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The Pacific Scientific M21NRXC-JNN-NS-02 is part of the POWERMAX II M Motors series and features a NEMA 23 frame size, weighing 1.5 pounds. This enhanced construction stepper motor has a bipolar holding torque of 142 Oz-In, a smooth single shaft, and no feedback encoder. It has a parallel current rating of 3.5 Amps per phase and operates at a step angle of 1.8 degrees with 200 steps per revolution.
Internal Product Review
The M21NRXC-JNN-NS-02 is a Pacific Scientific POWERMAX II M stepper motor with 142 Oz-In bipolar holding torque and a NEMA 23 frame. A low-inertia rotor and 1.8-degree step angle give the motor excellent indexing response and smooth positioning behavior. Class B 130°C insulation and 100 Megohms insulation resistance make this motor a dependable choice for controlled industrial motion.
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Product Description:
The M21NRXC-JNN-NS-02 stepper motor is manufactured by Pacific Scientific as part of the POWERMAX II M Motors series. Designed for incremental motion, it translates incoming pulse trains into discrete shaft movements, letting machine builders position light to medium loads without a closed-loop transducer. Because it has no integrated encoder and uses a simple lead-wire connection, the motor suits indexing tables, small conveyors, and electronic component handlers. Its open-loop operating style makes it suitable for applications where repeatable step response is more important than continuous position feedback.
In bipolar drive mode the motor develops a holding torque of 142 Oz-In, enough to resist back-driving when powered and stationary. The recommended parallel-connected phase current is 3.5 A/Phase. At this setting, the copper windings present a phase resistance of 0.56 Ω and a phase inductance of 2.0 mH, allowing rapid current decay for higher step rates. Each electrical cycle advances the rotor by 1.8 degrees, producing 200 full steps per mechanical revolution. Step accuracy remains within ±1.5 %, helped by the motor’s low-inertia rotor and single-stack construction that reduce overshoot during indexing moves. Two phases and winding code C are supplied through a receptacle-terminated lead-wire harness, while the enhanced construction option increases lamination density for improved torque in the same frame. No feedback devices are fitted, so position verification must come from the host controller.
Mechanically, the motor occupies a NEMA 23 frame and mounts through the standard flange used across many motion platforms. A smooth, single shaft transmits torque to timing pulleys, while the bearing set tolerates up to 20 Lb of radial loading and 13 Lb of axial loading. Continuous operation is permitted from -20 °C to +40 °C ambient, assisted by a thermal resistance of 5.5 °C/W and Class B insulation rated for 130 °C with 340 Vdc withstand and 100 Megohms isolation. At only 1.5 Lb, the unit is light enough for gantry axes that demand low moving mass, and the low-inertia rotor supports quick acceleration with reduced settling time.
