? No magnet required, anti stray magnetic field interference ? The design is flexible and can meet the application of various angles and displacements ? High precision, support multi-stage linearization calibration
The eddy current sensor contains a circuit board with a primary excitation coil, a secondary induction coil and a processing chip, which is encapsulated in a plastic shell and cooperates with a moving metal target for external sensing applications to detect the rotation or displacement of the target.
Based on the eddy current effect, the sensor generates high-frequency alternating electromagnetic field from the primary excitation coil etched on the internal circuit board and is coupled to two groups of secondary receiving coils to generate induced voltage. When the moving metal target is in different positions, the induced voltage obtained on the two groups of receiving coils is also different, and the ratio of the two voltages corresponds to the position of the metal target, After the matched integrated chip processing, the specific output signal corresponding to the position can be obtained.
Eddy current sensor can detect angle or displacement by using eddy current effect, metal sheet and reasonable coil design. Therefore, compared with the sensor based on Hall and magnetoresistance principle, it does not need to use a magnet, which can not only be replaced in function, but also has its incomparable ability to resist stray magnetic field interference, which is more in line with the requirements of new energy vehicles for higher magnetic field anti-interference ability. At the same time, due to the flexibility of the design, different coil designs can match different metal sheets to meet the angle measurement or displacement measurement in different ranges, so as to realize the application of various sensors on the vehicle. Such as transmission gear, seat position, steering wheel torque, etc.
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