Analysis and Experimental Research on High Frequency Magnetic Energy Loss of Different Magnetostrictive Materials

Advanced soft magnetic materials show high frequency, high magnetic flux density and the coexistence of miniaturization and multi-function development pattern. Some advanced electrical soft magnetic materials have developed rapidly, especially Fe-Co-V, Terfenol-D Magnetostrictive materials represented by Fe-Ga alloys are widely used and have a profound influence on power devices.

Fe-Co-V alloy has extremely high saturation magnetic induction (2.4T), Curie temperature (980~1100℃), large saturation magnetostriction coefficient (60~100×10-6), suitable for light weight and volume Small aviation components (such as relays, electromagnets, micro motors, etc.), but the alloy's resistivity (0.27Ωm) is low, and it is greatly affected by magnetic energy loss when used at high frequencies. Terfenol-D alloy is a magnetostrictive material with large magnetostriction coefficient (2000×10-6), high energy density and fast response speed. It has significant advantages in high-power ultrasound (f ≥20kHz) and sonar However, the alloy material generates hysteresis during high-frequency driving, which affects the energy conversion efficiency of the device.

Fe-Ga alloy has the advantages of high magnetic permeability, high stress sensitivity, and low saturation magnetic field. It is widely used in the field of new sensor devices and vibration power generation. The key index that affects the performance of Fe-Ga alloy devices is the magnetic properties of Fe-Ga alloy. Conductivity and electromagnetic losses [9-10]. Therefore, when three different magnetostrictive materials are used for device design in the high-frequency field, the analysis of high-frequency magnetic energy loss is the basis for the design and application of related alloy device structures.

Some scholars have studied the high-frequency magnetic properties of the ring-shaped Galfenol alloy, focusing on the analysis of the relationship between the magnetic permeability, coercive force, residual magnetic induction strength and loss with frequency.
Some scholars have found that the curve of the electromagnetic loss of Tbdyfe alloy with frequency is parabolic, and the eddy current loss accounts for the main part of the loss. A new type of composite material was prepared using Tbdyfe alloy powder. The electromagnetic loss is not greatly affected by frequency, and the main loss Hysteresis loss.
Some scholars measured the change of magnetic permeability with the strength of the external magnetic field in the FeCoB thin film of soft magnetic materials in the frequency range of 0.2 to 8 GHz.
Some scholars established the magnetic field function of giant magnetostrictive materials under AC excitation, found that the driving frequency will affect the size and hysteresis of the magnetic field, and obtained a mathematical model suitable for the calculation of magnetic energy loss at low and medium frequencies. Complex magnetic permeability, hysteresis characteristics of magnetic field and the influence of magnetic energy loss, but the article does not analyze the electromagnetic characteristics of materials at high frequency.
Some scholars have combined the traditional J-A hysteresis model with the transient eddy current and residual loss models to establish the J-A dynamic hysteresis model. This model requires more parameters and less application in actual engineering.
Some scholars have proposed an improved iron loss calculation model, which can reflect the eddy current skin effect, dynamic hysteresis loop and domain wall movement in the laminated material at high frequency and high magnetic density, and the experimental measurement results and calculation results There is a good correspondence.
Some scholars have improved the Steinmetz loss equation, and proposed a method for predicting the loss of different soft magnetic materials under symmetric and asymmetric magnetic induction waveforms. The experimental measurement and calculation results are compared to prove the engineering practicability of the method.
Some scholars have designed a dual-coil iron-gallium alloy hysteretic telescopic transducer, and analyzed the energy storage, electromagnetic loss, and mechanical energy change laws of the transducer at different magnetic field frequencies using the conversion relationship between magnetic energy and mechanical energy.

Due to the diversity of magnetostrictive materials and the complexity of hysteresis characteristics at high frequencies, there is less comparative analysis of the loss characteristics of different magnetostrictive materials with frequency. Researchers of Hebei University of Technology aim at the material selection problems encountered in the design process of magnetostrictive devices under the same engineering background, from the magnetic permeability, dielectric loss factor, dielectric energy storage and electromagnetic loss of different magnetostrictive materials Contrast and analyze the magnetic energy performance of Fe-Co-V, Terfenol-D and Fe-Ga alloys.

The magnetic energy loss model of the small hysteresis loop is introduced, and the AMH-1M-S type dynamic magnetic property test system is used to measure the typical magnetostrictive materials Fe-Co-V, Terfenol-D and Fe-Ga alloys at different excitation magnetic field frequencies and The dynamic hysteresis loop under the magnetic induction intensity, comparative analysis of the influencing factors of the magnetic energy loss of the three materials under different conditions, provides theoretical and experimental reference for the optimal design and application of new magnetostrictive devices.

Date:2020-06-04 09:53