LI Series Magnetic Encoder
BTENLI Series

Hardware Overview & Motion Architecture

LI Series Magnetic Encoder

BTENLI Series — Feedback

The Barronic Technologies LI series is a compact, PCB-form-factor magnetic rotary encoder that mounts directly on the rear of a NEMA stepper motor. An encoder magnet, supplied in the box, is fixed to the end of the motor shaft; the GMR (giant magnetoresistive) sensor on the encoder board reads the magnet's field without contact and produces quadrature incremental signals. With no shaft, bearings or coupling of its own, the encoder adds almost no length to the motor and has no wearing parts. Outputs are RS422 differential line-driver signals (A, B and index), giving reliable transmission over long cable runs in electrically noisy machines.

Key Performance Metrics

Engineering Features & Benefits

• •Non-contact GMR sensing: no optical disc and zero wearing parts
• •Shaftless design: mounts directly behind motor on rear shaft extension (magnet included)
• •4 selectable resolutions: 512, 1024, 2048, and 4096 PPR (9, 10, 11, 12 bit)
• •RS422 differential outputs: A+/A−, B+/B− quadrature and once-per-turn index
• •Speeds up to 9000 rpm, angle error ≤ 1.0° at 25 °C (≤ 1.9° over −40 to +125 °C)
• •Direct mechanical fit for NEMA 11, NEMA 14, NEMA 17, and NEMA 23 stepper motors
• •Single +5 V DC ±10% supply with low power consumption
• •Robust ESD protection compliant with IEC 61000-4-2 Level 4

Typical OEM Applications & Environments

• — Position feedback on NEMA 11, 14, 17 and 23 stepper motors
• — Industrial automation, packaging, and high-speed pick-and-place
• — Medical diagnostics and laboratory liquid handling equipment
• — Motor control, robotics, agricultural and semiconductor equipment