NEMA 17 closed loop stepper servo motors: These have frame size 42-42mm series , equipped with a 1000PPR incremental optical encoder, have great holding torque 0.45Nm, 0.59Nm and 0.75Nm & high speed upto 3000RPM. They 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.

NEMA 17 closed loop stepper servo motor Specification

• Step Angle: 1.8deg
• Bipolar/Unipolar: Bipolar
• Driving Voltage: 12-24VDC
• Insulation Class: B 130°C
• Frame Size: 42x42mm
• Shaft Diameter: Φ5mm
• Shaft Length: 24mm
• Encoder Type: Incremental Optical
• Encoder Resolution: 1000PPR
• 42AI40EC-1000: 0.45Nm, 2.0A, total Length=60mm
• 42AI48EC-1000: 0.59Nm, 2.0A, total Length=68mm
• 42AI60EC-1000: 0.75Nm, 2.1A, total Length=80mm

Overall Size

A small tip:
Microstepping is a way to trick a stepper motor into moving smoother and with higher precision than it normally can. Normally, stepper motors move in discrete steps. Imagine a staircase – each step is a fixed size. A typical stepper motor might have a step angle of 1.8 degrees. So, with each electrical pulse it receives, the motor jumps 1.8 degrees.
This step-by-step movement can be jerky, especially at slow speeds. It’s not ideal for tasks that require smooth, precise control.