12 N·m Integrated Closed-Loop Stepper Motor with 17bit Absolute Encoder (iRSS86-80-120-17BC)

High-Torque Axis with Servo-Style Feedback

The iRSS86-80-120-17BC pairs a 12 N·m stepper with an integrated drive and a 17bit absolute encoder. Position feedback is sampled every 50 μs, and the drive applies real-time error correction instead of relying on open-loop step counting. The result is a unit that behaves more like a servo in terms of response while retaining stepper simplicity and cost.

Application scenarios

Twelve N·m on an 86 mm frame makes this the go-to axis for the heavy positions on machine tools. On CNC machines it drives rotary axes and indexing heads that must hold a heavy table at a commanded angle and return to the same position after power loss, which the absolute encoder handles without a home run. Factory automation uses it on large turntables and pallet changers that rotate under load. Packaging lines use it for big case and drum rotary stations that need firm detents, while robotics relies on it for the base or shoulder rotation joints carrying the arm weight. Because the drive and motor are sealed together in an IP67 body, the unit mounts directly on the process area of washdown or dusty machinery instead of living inside a cabinet.

IP67 Protection for Harsh Environments

The unit carries an IP67 protection rating, so the integrated electronics can be mounted directly on machines exposed to dust, washdown, or particulates. This removes the need to keep the drive inside a sealed cabinet when the motor must sit in a harsh process area.

Thermal and Motion Behavior

Low heat generation and low vibration are listed characteristics of the series. Combined with fast acceleration, the axis maintains smooth motion during rapid start-stop cycles, which is relevant for machines that index quickly under load.

Key Specifications

• Frame size: 86 mm
• Length: 156 mm
• Holding torque: 12 N·m
• Rated current: 6.0 A
• Feedback: 17bit absolute encoder
• Protection: IP67

Engineering and Selection Advice

With 12 N·m at 6.0 A, confirm your control cabling and bus can supply the rated current continuously. The IP67 seal lets you place the unit in the process area, but keep coupling alignment within tolerance so the sealed enclosure is not stressed off-axis. The absolute encoder preserves position across power cycles, so design the machine to use this instead of adding home cams. Account for the 156 mm length and 86 mm frame in the mechanical envelope, especially at the back of the axis.