6.8 Nm Closed Loop Stepper Motor NEMA 34 3-Phase with 17-bit Encoder

6.8 Nm Closed Loop Stepper Motor for Mid-Range NEMA 34 Duty

The 86J12126EC-17BC is a 6.8 Nm Closed Loop Stepper Motor in a NEMA 34 frame, with a 126 mm body, 3.0 A phase current, and 14 mm shaft. It delivers 6.8 N·m holding torque and covers the middle of the NEMA 34 range, suited to machinery that needs repeatable positioning without the cost of a servo axis.

closed loop Control in Three-Phase Format

The motor combines a three-phase winding with an integrated 17-bit encoder. The drive reads real rotor position and corrects any difference from the commanded step position, so missed steps do not turn into accumulated positioning error. This is particularly valuable on printing and packaging machines where registration must hold across long production runs.

Performance Boundaries

Holding torque is the standstill value with rated current. At speed, torque declines as winding inductance limits current build-up. The 3.0 A rating defines the thermal budget; closed loop current management reduces standing current when the axis is at rest, helping keep the motor within its temperature limits.

Specifications

• Frame size: NEMA 34
• Body length: 126 mm
• Phase count: 3-phase
• Phase current: 3.0 A
• Holding torque: 6.8 N·m
• Shaft diameter: 14 mm
• Feedback: integrated 17-bit encoder

Applications and Selection

Applications include CNC machine tools, packaging machinery, factory automation, precision robotic mechanisms, textile and printing machinery, food processing, and automated handling mechanisms. The 6.8 N·m rating supports conveying, feeding, and indexing duties in industrial production equipment. Lyenwsin can pair this 6.8 Nm Closed Loop Stepper Motor with a compatible drive and provide the torque-speed data you need for sizing.

Ordering Support

Share your operating speed, load inertia, and duty cycle with our engineering team, and we will recommend the correct drive current and encoder cable length. Because the 126 mm body saves axial space, this motor is a frequent choice for machines with short axis compartments or limited cabinet clearance.