35 N·m 3-Phase closed loop Stepper Motor for Heavy-Duty CNC Axes

The 130J12225EC-17BC is a 35 Nm 3-Phase closed loop Stepper Motor in a NEMA 52 frame, rated 6.8 A per phase with 35 N·m holding torque and a 24 mm shaft. With a 225 mm body, it is designed for heavy-load axes where conventional 2-phase steppers run out of torque.

Three-Phase Drive and 17-Bit Feedback

Three-phase construction produces a smoother torque profile than a comparable 2-phase motor, with lower vibration across the speed range. The integrated 17-bit encoder closes the position loop: the drive knows the actual rotor angle to high resolution and corrects any deviation from the commanded position immediately. On large rotary tables and CNC axes, that means no missed steps even when the load torque varies.

Load and Thermal Considerations

Holding torque is the standstill rating with rated current. At running speed, torque falls as the winding builds current against its inductance; the 6.8 A rating defines the thermal budget. closed loop control reduces standing current during dwell, which limits temperature rise on machines that hold position for long periods between moves.

Key Specifications

• Frame size: NEMA 52
• Body length: 225 mm
• Phase count: 3-phase
• Phase current: 6.8 A
• Holding torque: 35 N·m
• Shaft diameter: 24 mm
• Feedback: integrated 17-bit encoder

Applications

We supply this motor for CNC machine tools, packaging machinery, factory automation, precision robotic mechanisms, textile and printing machinery, food processing, and automated handling mechanisms. Its 35 N·m rating supports heavy machining axes and large indexing loads where a servo would be expensive but an open-loop stepper would be marginal.

Selection Considerations

The 225 mm body and 35 N·m output require a stiff mounting structure and a drive that supports 3-phase closed loop control with 17-bit feedback at 6.8 A per phase. Confirm the speed-torque curve at your working speeds and allow for the motor’s weight and length in the machine layout. For builders pushing the torque limit of stepper technology, this unit bridges the gap to servo-class positioning.