What types of magnetic encoder?

Core Magnetic Encoder Type Classification

1. Classification by Motion Mode
Rotary Magnetic Encoder
Measures angle and speed by synchronously rotating a magnetic ring with the shaft. Suitable for motors and wind turbine pitch control systems.
Key Structure: Radially magnetized ring magnet, fixed sensor.
Linear Magnetic Encoder
A magnetic scale is laid along a linear track, and a slider equipped with a sensor detects displacement. Suitable for CNC machine tools and precision platforms.
Key Structure: Magnetized stripe scale, moving read head.

2. Classification by Position Feedback Mode
Incremental Magnetic Encoder
Outputs A/B pulse signals with a 90° phase difference, and calculates relative displacement by counting pulses.
Applications: Speed ​​control, continuously rotating equipment (such as conveyor motors).
Absolute Magnetic Encoder
Each position is assigned a unique digital code (such as Gray code), and position is retained even after power failure.
Applications: Safety-critical systems (wind turbine pitch control, robotic arm joints).
Hybrid Magnetic Encoder
Simultaneously outputs absolute position and incremental signals for mutual backup.
Applications: High-reliability applications (rail transportation, metallurgical equipment). 

3. Classification by Sensing Technology
Technology Type Principle Performance Characteristics Typical Applications
Hall Effect Encoder: Magnetic field change → voltage change. Low cost, good temperature resistance. Suitable for general-purpose motors, automotive electronics.
AMR Encoder: Resistance value changes with magnetic field direction. High sensitivity, strong anti-interference. Suitable for industrial servos, precision instruments.
GMR/TMR Encoder: Giant magnetoresistance/tunnel magnetoresistance effect. Ultra-high resolution, excellent temperature stability. Suitable for medical equipment, aerospace.

4. Classification by Mechanical Structure
Shaft Sleeve (Blind Hole)
Sleeve-mounted (sleeve-mounted) and flange-mounted. Suitable for space-constrained applications (such as small servo motors).
Hollow Shaft
Shaft hole-mounted: Directly passes cables or drive shafts, simplifying installation (such as robot joints).
Split Type: The sensor and magnetic target are separated, suitable for extremely large shaft diameters or special installations (such as rolling mill roller tables).

5. Classification by Redundancy Design
Dual-Channel Independent Type: Two sensors independently sample the same magnetic target, cross-checking the data (such as nuclear power valve control).
Dual Target Backup Type: The primary and backup targets are installed separately, with failover in the event of a single target failure (such as aircraft control surface feedback). 

6. Special Environment Adaptation
Explosion-Proof Magnetic Encoder
Fully sealed and flameproof housing, suitable for use in flammable environments such as chemical and mining industries.
Radiation-Resistant Magnetic Encoder
Aerospace-grade materials shield against gamma rays, suitable for use in nuclear power plants and satellite systems.