8.5 N.m NEMA 34 Closed-Loop Stepper Motor for Industrial Automation

8.5 N.m Closed-Loop Stepper in a 118 mm NEMA 34 Frame

At 118 mm body length, the 86J18118EC-1000-LS is the shorter-stack option in the NEMA 34 family, producing 8.5 N.m holding torque at 6.0 A per phase. The reduced stack keeps moving mass and rotor inertia lower than longer-frame equivalents, which matters on axes that reverse direction frequently or where the motor is mounted on a lightweight bracket.

Position Feedback That Prevents Step Loss

The integrated 1,000 P/R encoder feeds actual rotor position back to the drive. Instead of trusting that every commanded step occurred, the controller compares commanded and measured position continuously. Any divergence from a missed step is corrected immediately, so the axis does not accumulate positioning error across a production cycle.

Thermal Behavior at Continuous Duty

Holding torque is measured at standstill with rated current. During running operation, winding heating depends on duty cycle. Because the closed loop lets the drive reduce current when the rotor is at rest and restore it during motion, the motor runs cooler than an open-loop unit held at full current, which is relevant for enclosed or food-processing environments.

Specifications

• Frame size: NEMA 34
• Body length: 118 mm
• Phase count: 2-phase
• Phase current: 6.0 A
• Holding torque: 8.5 N.m
• Shaft diameter: 14 mm
• Feedback: integrated 1,000 P/R encoder

Applications

The motor is applied in CNC machine tools, packaging machinery, factory automation, precision robotic mechanisms, textile and printing machinery, food processing, and automated handling mechanisms. In printing and textile lines, the 8.5 N.m rating and 14 mm shaft handle web-driven and geared loads that need repeatable registration at moderate speed.