• 3 phase, NEMA34 frame size
• 156 mm long
• 2.8 A phase current
• 7.8 N.m holding torque
• 14 mm shaft size
• Built with high quality materials.High precision, low motor heating, and low vibration。
The 86J12156-328 is a 7.8 N·m 3-Phase Stepper Motor in a NEMA34 (86 mm) frame, engineered for machinery axes that need reliable positioning without the cost and tuning effort of a full servo system. Rated at 2.8 A per phase with a 156 mm body and 14 mm shaft, it delivers steady holding torque in a package that is straightforward to mount and wire.
Three-phase excitation lowers torque ripple at each step, so the axis runs with reduced vibration and audible noise. For packaging and textile equipment, this translates directly into steadier handling and fewer disturbances to the workpiece or web being processed. The winding is also wound to limit resistive heating, which helps position accuracy stay stable over long runs.
The 14 mm shaft connects to standard couplings and timing pulleys used in industrial machinery. As an open-loop motor, it follows step and direction commands with no encoder feedback and no gain tuning, keeping commissioning simple. With only 2.8 A needed per phase, it pairs with a modestly sized 3-phase stepper drive.
This motor is a practical fit for compact CNC equipment, packaging machinery, factory automation, compact robotic mechanisms, textile machinery, printing machinery and food processing lines. Its combination of torque, low vibration and the common NEMA34 footprint makes it a workhorse for continuous-index and intermittent-motion duty in compact automation cells.
Choose a 3-phase drive rated for at least 2.8 A output per phase. Confirm the coupling bore matches the 14 mm shaft and that the axis duty cycle stays within the motor thermal rating. Because open-loop systems do not correct missed steps, verify the load torque at operating speed against the torque-speed curve rather than sizing on the holding value alone. As a distributor, Lyenwsin can supply matching drives, cables and technical support to complete your axis.
| Model | 86J12156-328 |
| Phase | 3 |
| Step Angle（deg） | 1.2 |
| Holding Torque(N·m) | 7.8 |
| Rated Current（A） | 2.8 |
| Phase Resistance(ohm) | 5 |
| Phase Inductance（mH） | 32 |
| Detent Torque（mN·m） | 3000 |
| Rotor inertia（g·cm²） | 4000 |
| Insulation Class | B |
| Number of Leads | 6 |
| Weight（kg） | 5 |
| Length（mm） | 156 |
| Matched Drive | 3DM3422 |
| Frame Size（NEMA） | 34 |
| Shaft Diameter（mm） | 14 |
| Frame Size(mm) | 86 |
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