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.
Frequently Asked Questions about M21NRXC-JNN-NS-00:
Q: What is the maximum axial shaft load for the M21NRXC-JNN-NS-00 motor?
A: This model supports up to 13 lb of axial shaft load, making it suitable for various mechanical setups.
Q: What is the parallel hold torque of the M21NRXC-JNN-NS-00?
A: The M21NRXC-JNN-NS-00 has a parallel hold torque of 142 oz-in, measured under parallel wiring configuration.
Q: How many steps per revolution does the M21NRXC-JNN-NS-00 offer?
A: This motor provides 200 steps per revolution with a step angle of 1.8 degrees, allowing precise positioning.
Q: What is the frame size of the M21NRXC-JNN-NS-00 motor?
A: The M21NRXC-JNN-NS-00 features a NEMA 23 frame size for standardized mounting compatibility.
Q: Does the M21NRXC-JNN-NS-00 motor come with feedback options or encoders?
A: No feedback encoder is included with this model, making it suitable for open-loop control applications.
