57J18100EC-1000-LS 2.8 Nm Closed Loop Stepper Motor - NEMA 23

The 57J18100EC-1000-LS is a 2.8 Nm Closed Loop Stepper Motor in a NEMA 23 frame, with a 100 mm body and 8 mm shaft, at 4.0 A per phase. It sits at the higher end of the NEMA 23 range, covering desktop CNC and robotic axes that previously needed a larger frame.

closed loop Advantages in Motion Control

Open-loop steppers can lose steps under load without the controller knowing, which is exactly what happens on CNC spindles and robotic joints during rapid acceleration. The integrated 1,000 P/R encoder on this motor reports actual rotor position to the drive. When commanded and measured positions diverge, the drive corrects the error immediately, so the axis maintains its path instead of drifting.

Choosing Torque and Speed

Holding torque is the standstill rating with rated current. Available torque drops as speed rises, limited by winding inductance. For desktop CNC, the closed loop drive also lets the motor run with reduced standing current between moves, keeping the frame cooler than an open-loop unit idling at full current.

Key Specifications

• Frame size: NEMA 23
• Body length: 100 mm
• Phase count: 2-phase
• Phase current: 4.0 A
• Holding torque: 2.8 N·m
• Shaft diameter: 8 mm
• Feedback: integrated 1,000 P/R encoder

Applications

The motor is used in CNC machine tools, packaging machinery, factory automation, precision robotic mechanisms, textile and printing machinery, food processing, and automated handling mechanisms. Its torque and compact size make it a common choice for small machining axes, robotic wrist joints, and indexing mechanisms in production lines.

Selection Considerations

Use a closed loop stepper drive that reads the 1,000 P/R encoder and delivers 4.0 A per phase. For desktop CNC, check the speed-torque curve at your cutting speeds, and for robotics confirm the axis inertia stays within the drive’s control band. The 8 mm shaft and NEMA 23 pattern simplify mounting into existing motion control builds.