The measurement principle of a magnetic induction angle encoder is to detect changes in the magnetic field to obtain rotational position information and convert it into an electrical signal output.

The working principle of a magnetic induction angle encoder is as follows:

Magnetic Field Generation: Inside the encoder, one or more permanent magnets generate a stable magnetic field.

Sensor Detection: The sensor section of the encoder typically consists of Hall elements or magnetoresistive elements, which can detect variations in the magnetic field. As the magnet moves relative to the sensor, the strength and direction of the magnetic field change.

Signal Conversion: The sensor converts these changes into electrical signals. For example, Hall effect sensors utilize the Lorentz force acting on charge carriers in a magnetic field to generate a Hall voltage proportional to the magnetic field strength; magnetoresistive sensors exploit the property that the resistivity of magnetoresistive materials varies with the direction of the magnetic field.

Signal Processing: Internal circuitry within the encoder processes these electrical signals into digital signals representing angular or positional information.

The performance of magnetic encoders is determined by two core aspects: first, signal generation—how the magnetic field is established, how magnetic-to-electrical conversion occurs, and how orthogonal analog signals are output; second, signal decoding—how the true angle is reconstructed from noisy, distorted, and offset analog signals. Together, these factors determine the encoder's resolution, accuracy, response speed, and stability.

Advantages of magnetic encoders include stable operation under oily, vibrating, high-temperature, or low-temperature conditions, strong resistance to electromagnetic interference, suitability for use in environments with strong magnetic fields, and the ability to achieve very high precision and resolution.