Model Parameters Table

General Specifications

Electromagnetic Induction Encoder | Non‑Contact High‑Precision Position Sensor

Product Overview

The Electromagnetic Induction Encoder is a non‑contact position sensor built upon high‑frequency electromagnetic induction. Through magnetic field coupling between the stator and rotor, it delivers precise absolute or incremental position feedback. It is widely used in servo motors, robotic rotary joint actuators, humanoid robot joints, collaborative robot joints, quadruped robot (robot dog) actuators, and other demanding motion‑control applications.

Working Principle

The encoder consists of two main components:

• Stator Board (stationary): Embedded with precision sensing coils, it generates a high‑frequency alternating magnetic field that serves as the reference signal for position detection.

• Rotor Disc (attached to the rotating shaft): Its specially patterned conductive elements modulate the phase of the magnetic field as the shaft rotates. The stator coils capture the resulting induced signals.

By demodulating the phase difference of these high‑frequency induced signals, the system calculates the absolute angular position or rotational speed in real time with exceptional accuracy.

Key Advantages

• Non‑Contact Operation – Eliminates mechanical friction and wear, ensuring an exceptionally long service life.

• Superior Environmental Robustness – Unaffected by oil, dust, moisture, or condensation; ideal for harsh industrial settings.

• High Interference Immunity – Magnetic coupling provides stable performance against ambient light, vibration, and temperature drift.

• Fast Dynamic Response – High‑frequency excitation enables reliable feedback even at extremely high rotational speeds.

• Compact & Lightweight – PCB‑based coil design allows a slim profile and easy integration into space‑constrained equipment.

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Typical Applications

• Servo motors and direct‑drive (DD) motors

• Humanoid robot joints, collaborative robot joints, and robot dog actuators

• CNC rotary tables and indexing units

• Medical imaging devices and precision turntables