Design and output characteristics of magnetostrictive displacement sensor with magnetoelectric coupling and small blind area
A high-precision and small-blind magnetostrictive displacement sensor with a magnetoelectric coupling sensor configuration was proposed for the displacement measurement scenarios where the installation space is limited,such as in electro-hydraulic power system,hydraulic cylinder and precision machinery,and where measurement accuracy is required. The signal detection element of the sensor adopts Co70Fe30/PZT-5/Co70Fe30 magnetoelectric composite as the core sensitive material,which operates in a longitudinal magnetization-transverse polarization operating mode. An adjustable experimental platform was set up for pulse current and axial bias magnetic field,using a 0.5 mm diameter Fe46.5Ni48.5Cr2Ti2.5Al0.5 waveguide to verify the accuracy of the model. The optimal excitation pulse current range of the sensor is 15～30 A and the optimal bias magnetic field range is 15～25 kA/m. Using Fe-Ni as waveguide wire material and Co70Fe30/PZT-5/Co70Fe30 magnetoelectric composite material,a prototype magnetoelectric coupling magnetostrictive displacement sensor was designed,and the measurement and calibration platform of the displacement sensor was built. The measurement accuracy of the prototype was±0.02 mm,and the distance of a small blind area was 15 mm. Compared with the traditional coil-sensing magnetostrictive displacement sensor with the same parameters,the precision is increased by 33％,and the blind zone distance is reduced by 85％.
magnetostrictionmagnetoelectric composite materialsdisplacement sensoroutput voltage modelsmall blind area
万方数据
维普
