Product Short Description
Product Series
MRE Contactless Magnetic Rotary Position Encoder Industrial Series
Product Brief
Contactless single-turn absolute magnetic rotary encoder with 256 unique position resolution steps, designed for shaft rotational position feedback on servo actuators, valve actuators and rotating industrial machinery without mechanical gear wear components.
Description
Technical Specifications
- Absolute Position Resolution: 256 single-turn unique position codes (8-bit digital resolution)
- Sensing Technology: Contactless magnetic Hall-effect position detection
- Shaft Diameter Compatibility: 5 mm nominal target shaft size
- Output Interface: SSI synchronous serial digital output
- Operating Supply Voltage: DC 3.3 V to DC 5 V wide range logic supply
- Operating Temperature Range: -40 °C to +125 °C
- Protection Class: IP67 sensor element assembly
- Rotation Speed Limit: Maximum continuous 12,000 RPM mechanical rotational velocity
- Position Repeatability: ±1 LSB single-step repeatability tolerance
Functional Features
- Absolute single-turn position output; no homing sequence required after full power loss cycle
- Contactless magnetic sensing with zero mechanical friction or wear between magnet target and sensor IC
- Wide -40 °C to +125 °C temperature range supporting engine bay and outdoor high-temperature machinery mounting
- SSI serial digital output immune to analog signal attenuation over moderate cable lengths
- Integrated reverse polarity power supply protection and ESD surge protection circuits
- Compact flat PCB form factor for embedded installation inside small servo motor housings
Structural Characteristics
- Sensor core: Surface-mount Hall-effect magnetic sensing integrated circuit on thin FR4 PCB substrate
- Target magnet: Radial polarized high-temperature ferrite ring magnet for shaft mounting
- Outer packaging: Reinforced glass-filled PA66 plastic IP67 sealed housing
- Connector: Miniature 4-pin SSI straight M8 industrial sealed connector
Working Principle
Radial polarized ring magnet fixed to rotating target shaft generates uniform magnetic field across stationary Hall-effect sensor PCB array; multi-channel Hall ICs measure magnetic field vector angle to calculate absolute single-turn rotational position value, transmitting encoded position data via SSI synchronous serial digital communication to controller hardware.
Advantage Highlights
- Contactless magnetic operation eliminates mechanical wear for extended maintenance-free service life
- Absolute position feedback removes requirement for homing routine after power interruption
- Compact flat PCB form factor enables embedded installation within miniature servo motor and valve actuator housings
- IP67 sealed assembly withstands washdown, coolant splash and high-humidity industrial environments
- High +125 °C maximum operating temperature suited for internal combustion engine auxiliary actuators
Applicable Industries
Hydraulic proportional valve position feedback, small servo motor rotational positioning, automotive engine throttle actuator monitoring, packaging machine rotary axis control, agricultural machinery valve position sensing
Installation Requirements
- Mount radial ring magnet concentrically onto 5 mm target shaft with maximum total indicated runout <0.1 mm
- Maintain fixed 1–2 mm air gap between magnet surface and sensor PCB face during permanent mounting
- Limit SSI communication cable total length to maximum 30 m without signal repeater hardware
- Ground sensor housing protective earth terminal to machine main grounding bus bar
Operation Precautions
- Prevent contact between magnet target and high-strength external neodymium magnets causing demagnetization
- Do not scratch or deform sensor PCB front surface; physical damage distorts magnetic field measurement
- Avoid continuous exposure of encoder assembly to temperatures exceeding +125 °C
- Use shielded twisted pair SSI digital cable assemblies to suppress electromagnetic communication noise
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