17-bit NEMA 42 Closed Loop Stepper Motor - 12 N·m

17bit NEMA 42 Closed Loop Stepper for Heavy CNC Axes

The 110J12135EC-17BC is a 17bit NEMA 42 Closed Loop Stepper delivering 12 N·m holding torque from a compact 135 mm body while drawing 4.5 A per phase on a 19 mm shaft. It is the shortest unit in the NEMA 42 series, combining the stiffness of a 110 mm frame with lower rotor inertia for faster cycle times.

Because the encoder is integrated, the drive always knows the real rotor position. Commanded and measured positions are compared on every cycle, and any deviation is corrected before it affects the machined part. This turns the motor into a practical alternative to small servos on axes where the load is heavy but the control system remains stepper-based.

Thermal and Mechanical Notes

Holding torque is the standstill rating. At speed, available torque declines with the winding’s current rise capability, and the 4.5 A rating defines the thermal envelope. The closed loop lowers standing current during dwell, keeping the frame cooler inside enclosed machine housings and reducing heat soak into adjacent components.

Key Specifications

• Frame size: NEMA 42
• Body length: 135 mm
• Phase count: 3-phase
• Phase current: 4.5 A
• Holding torque: 12 N·m
• Shaft diameter: 19 mm
• Feedback: integrated 17-bit encoder

Industrial Applications

This 17bit NEMA 42 Closed Loop Stepper is used in CNC machine tools, packaging machinery, factory automation, precision robotic mechanisms, textile and printing machinery, food processing, and automated handling mechanisms. The 12 N·m rating covers machine tool axes, indexing tables, and heavy material-handling mechanisms. For heavy-load CNC axis feeds and rotary table indexing, the 17-bit feedback keeps every move repeatable and eliminates re-homing after a stall.

Selection Considerations

When selecting a closed loop stepper for this duty, verify the drive can supply 4.5 A per phase and that the encoder interface matches your controller. Check the torque-speed curve at your operating speed, especially for fast accelerations on heavy axes. As a distributor, Lyenwsin can supply the motor with a matched closed loop drive and technical support for sizing and commissioning. For machines that combine several NEMA 42 axes, the moderate current draw also simplifies the control cabinet power budget.