Comparing Commutation Encoders: Quantum Devices QML35/QM35 vs. Renco RCML15/R35i and CUI AMT312S/AMT312D

Whitepaper Overview

Bearingless encoders containing commutators have become quite popular in a host of industrial applications today. Due to increasing industry demand for smaller high function encoders, manufacturers also need to shrink package sizes. Commutators in modern encoders offer several benefits, including reducing hard motor costs by eliminating the need for hall boards, reducing the magnet volume from the motor, decreasing the motor fabrication time, and reducing the number of cables or conductors mating the motor assembly to the drive.

This Whitepaper outlines the similarities and differences between commutation encoders from leading electronic manufacturers. The products selected are Quantum Devices’ QML35/QM35 and Renco’s RCML15/R35i based on optical transmissive sensing using sealed LEDs, and CUI Devices’ AMT312 series encoders based on capacitive technology.