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1. Basic Definition
A double code magnetic encoder is a position sensor that uses magnetic field induction technology to detect changes in the magnetic field of a magnetic scale or magnetic ring, and output two independent signals for measuring the position, velocity, and direction of rotational or linear motion.
2. Core Features
double channel output: Provides two independent position signals (such as A/B phase incremental signals or double absolute encoding) to enhance system redundancy and anti-interference capability.
Non contact detection: No mechanical wear, avoiding the problem of optical encoder contamination caused by dust and oil stains in traditional photoelectric encoders.
High environmental adaptability: suitable for harsh industrial environments such as dust, oil pollution, vibration, etc., with a protection level usually above IP65.
3. Working principle
Magnetic induction principle: The magnetic field changes of the magnetic scale are detected by Hall elements or magneto resistive sensors and converted into electrical signals.
Double code design:
Double code design:
Incremental: Output A/B pulse signals with a phase difference of 90 °, and calculate displacement through pulse counting and direction discrimination.
Absolute formula: Each position corresponds to a unique encoded value, and the current position can still be remembered even after power failure.
4. Main application scenarios
Main application scenarios**
Industrial automation: servo motors, robotic arm joint positioning.
Wind power variable pitch system: redundant angle feedback to ensure safe control of wind turbines.
Rail transit: Train door position detection, bogie angle monitoring.
Metallurgy and Heavy Machinery: Synchronization of Roller Rollers in Hot Rolling Production Lines and Position Feedback in High Vibration Environments.
5. Advantages compared to traditional encoders
| Feature | Double-Code Magnetic Encoder | Traditional Encoder |
| Environmental Resistance | Immune to dust, oil, moisture (IP65+) | Sensitive to contamination; requires cleaning |
| Mechanical Wear | No contact → No wear | Code wheel/read head can degrade |
| Vibration Tolerance | Stable in high-vibration environments | Prone to misalignment from shocks |
| Power Loss Behavior | Absolute versions retain position | Incremental types need re-homing |
| Installation Flexibility | Works in tight spaces (hollow shaft options) | Requires precise alignment |
| EMI Resistance | Magnetic signals resist interference | Susceptible to electrical noise |
| Temperature Range | Wider operating range (-40°C to +120°C typical) | Limited by optical components |
6. Key factors for selection
Signal type: Choose absolute or incremental based on requirements.
Protection level: The IP level should match the environmental requirements (such as IP67 for outdoor or humid environments).
Mechanical interface: shaft type, flange type or hollow shaft design, suitable for installation space.
Communication protocol: Supports industrial bus protocols such as SSI, BiSS, EtherCAT, etc.
