NEMA 23 closed loop 1-2Nm: This frame size 57-56mm NEMA 23 closed loop stepper motor, equipped with a 1000cpr incremental optical encoder, has a rated current of 3.5A and a holding torque of 1.2Nm. It offers higher accuracy, higher output torque, higher speed, lower motor heating, lower power consumption, and faster response to drive controllers compared to open loop stepper motors. Recommended drive: Leadshine CL57C Closed-Loop Stepper Motor Drive

NEMA 23 closed loop 1-2Nm Specification

• Part Number: 57AI56EC-1000
  Step Angle: 1.8deg
  Bipolar/Unipolar: Bipolar
  Holding Torque: 1.2Nm
  Rated Current/phase: 3.5A
  Driving Voltage: 24-48VDC
  Frame Size: 57x57mm
  Body Length: 79mm
  Shaft Diameter: Φ8mm
  Shaft Length: 21mm
  D-cut Length: 18mm
  Encoder Type: Incremental Optical
  Encoder Resolution: 1000CPR

A small tip:

Unlike open-loop stepper drives, which simply send a certain number of pulses to the motor and assume that it will reach the correct position, closed-loop stepper drives can compensate for errors such as missed steps or motor shaft slippage. This makes them a more reliable option for applications that require high precision.