Method and system for measuring dynamic electromagnetic loss of giant magnetostrictive transducer

Abstract

The invention discloses a method and system for measuring dynamic electromagnetic loss of a giant magnetostrictive transducer. The method includes the following steps that: the driving coil input current measured by a signal measuring unit and an induced voltage signal on a detection coil enter a DSP through the processing of a signal conditioning circuit and AD sampling; the DSP quickly obtains the magnetic field strength peak value and the magnetic induction intensity peak value of a transducer bar during the working process by adopting a continuous comparison window comparison method; the rising edge generated by a zero-crossing capture circuit triggers the DSP interruption to start the timing of a timer to obtain the phase difference between the magnetic field strength and the magneticinduction intensity, so that the amplitude complex permeability of the bar and the electromagnetic loss during the actual working process of the bar can be measured. According to the method for measuring the dynamic electromagnetic loss of the giant magnetostrictive transducer disclosed by the invention, the electromagnetic loss of a broadband giant magnetostrictive transducer during normal working can be simply and quickly measured, and the influence of different driving currents, driving frequencies and prestress on the amplitude permeability and the electromagnetic loss of the transducer can be quickly reflected.

Description

technical field [0001] The invention relates to the measurement field of giant magnetostrictive transducers, in particular to a method and system for measuring dynamic electromagnetic loss of giant magnetostrictive transducers. Background technique [0002] Giant magnetostrictive material has the characteristics of high strain under alternating magnetic field, and it is a new type of vibration basic material. It is widely used in actuators, electroacoustic transducers and other occasions. Due to the relatively low magnetic permeability and electrical conductivity of giant magnetostrictive materials, hysteresis loss, eddy current loss and abnormal loss will occur in the process of AC magnetization, and as the frequency and amplitude of the driving magnetic field increase, the electromagnetic loss The increase will cause the temperature of the transducer to rise and the strain of the rod to decrease, which will seriously affect the output sound power of the transducer, result...

AI Technical Summary

Problems solved by technology

Due to the relatively low magnetic permeability and electrical conductivity of giant magnetostrictive materials, hysteresis loss, eddy current loss and abnormal loss will occur in the process of AC magnetization, and as the frequency and amplitude of the driving magnetic field increase, the electromagnetic loss increase, resulting in an increase in the temperature of the transducer and a decrease in the strain of the bar, which seriously affects the output sound power of the transducer, resulting in low energy conversion efficiency

[0003] With the continuous development of giant magnetostrictive transducers, the requirements for the electromagnetic conversion efficiency of transducers are increasing day by day. The traditional electromagnetic loss measurement method is only for the measurement of magnetostrictive materials at low frequencies, and the measured objects are all ring-shaped. Magnetostrictive materials, and methods such as analog circuits and oscilloscope methods are often used. These methods have high requirements on the RC parameters of analog circuit components, and are greatly affected by system interference. The frequency range of measurement is limited and cannot be calculated in real time. The electromagnetic loss during normal operation of the transducer cannot provide help for the design of high electromagnetic conversion efficiency of the transducer

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