P21SRXB-LSS-NS-02 Pacific Scientific
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The Pacific Scientific P21SRXB-LSS-NS-02 is part of the POWERMAX II P Motors series and comes in a NEMA 23 frame size with standard construction. This stepper motor features a holding torque of 0.79 Nm, 200 steps per revolution at a step angle of 1.8 degrees, and operates with a rated current of 4.6 A per winding. It is designed for two-phase operation and has an IP23 protection class.
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Product Description:
The P21SRXB-LSS-NS-02 stepper motor is produced by Pacific Scientific as part of the POWERMAX II P Motors series. Designed for incremental positioning in pick-and-place arms, small conveyors, or fluid metering pumps, it converts digital pulse trains into controlled shaft movement without requiring feedback. The motor uses a two-phase winding set and a standard rotor to create discrete steps, and its single-stack construction keeps overall length short while preserving torque density for compact machine frames.
It delivers a static shaft holding capability of 0.79 N·m, which is the maximum load the shaft can resist when the coils are energized. Each command pulse advances the shaft by 1.8 degrees, producing 200 full steps per revolution for precise angular indexing. The housing follows the NEMA 23 frame standard so mounting holes, pilot diameter, and shaft height match common brackets. The motor draws 4.6 A per phase at rated operation, and the IP23 rating indicates that ventilation openings admit only small airborne debris, suiting the motor for cabinet installation with forced airflow. A single laminated stator stack, a B-type winding, and 0.64 Ω resistance balance current response with copper loss.
The residual cogging is limited to 0.03 N·m of detent torque, so low-speed micro-step motion is smooth. Safe service is maintained in ambient temperatures from -20 °C to +40 °C; internally, class B insulation tolerates 130 °C while external surfaces may reach 95 °C at worst-case load. Windings are separated from the frame by 100 Megohms of resistance and withstand up to 340 Vdc without breakdown. An inductance of 1.1 mH moderates current rise time, supporting high pulse rates without excessive ringing. The regular leadwire style terminates in a receptacle for straightforward field wiring, and standard construction keeps the motor compact for typical NEMA 23 installations. Step accuracy remains within ±1.5%, giving predictable positioning.
Frequently Asked Questions about P21SRXB-LSS-NS-02:
Q: What is the holding torque of the P21SRXB-LSS-NS-02 stepper motor?
A: This model has a holding torque of 0.79 N·m, making it suitable for applications requiring reliable holding force.
Q: What connection options are available on the P21SRXB-LSS-NS-02 motor?
A: The P21SRXB-LSS-NS-02 supports a regular leadwire connection style and also includes a receptacle.
Q: What is the protection class rating of the P21SRXB-LSS-NS-02 motor?
A: This stepper motor is built with IP23 protection, providing limited ingress protection against solid objects and dripping water.
Q: What is the step angle and steps per revolution for the P21SRXB-LSS-NS-02?
A: The step angle is 1.8 degrees, giving the motor 200 steps per revolution for precise positioning.
Q: Does the P21SRXB-LSS-NS-02 motor come with an encoder for feedback?
A: No feedback encoder is included on the P21SRXB-LSS-NS-02, as it does not have an encoder option.
