The MG Series Encoder system refers to high-precision, dual-encoder configurations built directly into advanced robotic joint actuator modules (such as the OpenELAB MG6010-i6 V3, MG4005E, and MG5010E). These encoders are uniquely engineered to solve the most difficult challenges in robotic joint position tracking—specifically eliminating backlash and dealing with structural deflection in highly dynamic robots like quadrupeds, collaborative arms, and AGVs. Key Structural Innovation: The Dual-Encoder System
Traditional robotic tracking relies on a single encoder on the motor shaft. MG Series modules employ a dual-encoder topology to provide true closed-loop feedback at both ends of the joint:
Motor-Side Encoder (High Resolution): Typically an 18-bit absolute encoder located directly on the brushless motor rotor. It tracks the motor’s high-speed rotation to ensure ultra-smooth Field-Oriented Control (FOC) commutations.
Reducer/Output-Side Encoder: Typically a 14-bit encoder positioned after the planetary gearbox or reducer. It tracks the absolute physical position of the robot limb or joint output.
[ Brushless Motor ] —> [ 18-bit Encoder ] | [ Planetary Gearbox ] | [ 14-bit Encoder ] —> [ Joint Output Axis ] Why It Matters for Robotic Tracking 1. Eliminating Gear Backlash
All mechanical gears have small gaps between teeth (backlash), which causes the robot arm or leg to drift slightly even if the motor hasn’t moved. By placing the 14-bit encoder on the actual joint output, the robot’s central controller bypasses gearbox errors and tracks the exact, literal angle of the limb. 2. Dynamic Impact & Fall Recovery
For legged robots (quadrupeds), stepping on uneven terrain or jumping subjects the joint to sudden external forces. Because MG Series encoders provide real-time absolute digital positioning, the system can instantly calculate output deviation versus motor position to adapt its compliance or recover from falls without losing its “home” calibration. 3. True Absolute Reference
Upon a power cycle, standard incremental encoders require the robot to “home” itself by moving until it hits a physical limit switch. MG Series absolute tracking reads a unique digital signature for every angle immediately upon booting. The robot knows its exact spatial arrangement even if it was manually moved while powered down. Technical Specifications & Architecture
While exact specs vary by the specific module chosen, the standard baseline for MG Series joint tracking includes: Encoders for a Legged Robot – FLUX GmbH