86 mm closed loop Stepper Motor with 8.5 N·m Holding Torque

The iESS86-80-85-17BC-RC/EC is an 86 mm closed loop Stepper Motor rated at 8.5 N·m holding torque with 6.0 A phase current on an 80 VDC bus. It carries an integrated drive and a 17-bit absolute encoder, with RS485+CAN or EtherCAT fieldbus options. The unit is supplied as a single-axis component for machines that need high torque without a drive module in the control cabinet.

Panel-Free Drive Mounting

Because the drive is attached to the motor, the control cabinet does not need a drive slot or a long motor cable. This is a practical advantage on large machines where the panel is far from the axis, and it shortens the shielded power run that is a common noise source on stepper systems.

Torque at Speed

The 80 VDC bus keeps torque available across a wider speed range than a 36 VDC equivalent. The 8.5 N·m static rating gives margin for direct-drive indexing without a gearbox on moderate loads.

Specifications

• Frame size: 86 mm
• Holding torque: 8.5 N·m
• Supply voltage: 80 VDC
• Rated current: 6.0 A
• Fieldbus: RS485 + CAN / EtherCAT
• Encoder: 17-bit absolute
• Control: closed loop

Installation Notes

Thermal contact between the 86 mm frame and the machine structure is important; the integrated drive adds heat on top of winding loss. Provide ventilation and avoid running at rated current continuously without a heat path.

Applications

• Industrial automation
• Packaging machinery
• Robotics
• CNC machine tools

Selection Guidance

Confirm that the 80 VDC supply is regulated and that the fieldbus variant matches the machine controller. For indexing duties, compare the available torque at speed against the cycle requirement rather than relying on the static rating alone. The integrated construction also simplifies spare parts handling, because one part number covers motor, drive, and encoder for each axis. Ask Lyenwsin for the current profile settings and fieldbus addressing guide.