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

7.8 Nm Closed Loop Stepper Motor for Textile and Packaging Lines

The 86J12156EC-17BC is a 7.8 Nm Closed Loop Stepper Motor in a NEMA 34 frame, rated 3.0 A per phase with 7.8 N·m holding torque on a 14 mm shaft in a 156 mm body. Three-phase excitation gives it a smoother torque curve than 2-phase equivalents, with lower vibration at moderate speeds and steadier motion under varying web tension.

Encoder Feedback for Industrial Consistency

The integrated 17-bit encoder gives the drive continuous knowledge of rotor position. Commanded and measured positions are compared on every cycle, and any step loss is corrected in real time. In textile and packaging lines that run continuously, this removes the drift that open-loop steppers can accumulate under changing load and friction.

Current and Temperature Behavior

Holding torque is specified at standstill with rated current. Running torque falls as speed rises because the winding builds current more slowly. The 3.0 A rating keeps heat low relative to the torque produced, and closed loop current reduction during idle further limits temperature rise in enclosed cabinets.

Specifications

• Frame size: NEMA 34
• Body length: 156 mm
• Phase count: 3-phase
• Phase current: 3.0 A
• Holding torque: 7.8 N·m
• Shaft diameter: 14 mm
• Feedback: integrated 17-bit encoder

Applications

The motor serves CNC machine tools, packaging machinery, factory automation, precision robotic mechanisms, textile and printing machinery, food processing, and automated handling mechanisms. The 7.8 N·m rating with three-phase smoothness fits textile feeders, printing registration, and food-processing conveyors. Lyenwsin supplies this motor with matched closed loop drives and can help confirm encoder wiring for your controller.

Integration Notes

When the axis is driven at moderate speed for long shifts, confirm that the drive’s current setting matches the 3.0 A rating and that the enclosure allows airflow around the motor. The compact NEMA 34 footprint keeps retrofit work simple, and the same frame pattern is widely used in OEM machine designs.