57 mm closed loop Stepper Motor with 3.0 N·m Torque

The iESS57-36-30-17BC-RC is a 57 mm closed loop Stepper Motor with 3.0 N·m holding torque and 4.0 A phase current, powered from 36 VDC and controlled over RS485+CAN. A 17-bit absolute encoder closes the loop around the rotor position, and the drive is integrated into the motor body. The unit is supplied as a complete axis for robotics, desktop CNC, and compact industrial automation.

Frame Size and Torque

The 57 mm frame is a middle ground between the 42 mm and 60 mm sizes. Delivering 3.0 N·m from this frame requires the full 4.0 A winding current, which the integrated drive supplies directly at the motor.

closed loop Operation

The absolute encoder reports position without a reference run, and the closed loop corrects load-induced step loss. This keeps positioning repeatable on axes with variable friction or load.

Specifications

• Frame size: 57 mm
• Holding torque: 3.0 N·m
• Supply voltage: 36 VDC
• Rated current: 4.0 A
• Fieldbus: RS485 + CAN
• Encoder: 17-bit absolute
• Control: closed loop

Thermal Behavior

At 4.0 A the winding loss is moderate, but the integrated drive raises the housing temperature during continuous use. Provide airflow and a metal mounting path, and treat 3.0 N·m as the static limit for thermal design. For longer production runs, derate the torque or increase airflow to keep the winding temperature within the continuous-duty limit.

Applications

• Industrial automation
• Packaging machinery
• Robotics
• CNC machine tools

Selection Notes

Confirm the 36 VDC supply is sized for the 4.0 A peak current and that the RS485 or CAN bus is terminated and addressed correctly. The closed loop maintains position during load changes, which suits robotic gripper and desktop CNC axes. The 57 mm frame also bridges the gap between the 42 mm and 60 mm sizes, which helps when the mounting envelope is tight but torque demand is above the smaller frame’s rating. Contact Lyenwsin for the torque-speed curve and RS485 addressing guide.