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

Abstract

The invention discloses a method and system for measuring the dynamic electromagnetic loss of a giant magnetostrictive transducer. The input current of the drive coil and the induced voltage signal on the detection coil measured by the signal measurement unit are sent to the DSP through the signal conditioning circuit and AD sampling. . The DSP adopts the method of continuous comparison window comparison to quickly obtain the peak magnetic field intensity and magnetic induction intensity of the transducer rod during the working process, and the rising edge generated by the zero-crossing capture circuit triggers the DSP interrupt to start the timer to obtain the magnetic field intensity and magnetic induction intensity. The phase difference between them can measure the amplitude complex magnetic permeability and electromagnetic loss of the bar during the actual working process. The method for measuring the dynamic electromagnetic loss of the giant magnetostrictive transducer adopted in the present invention can easily and quickly measure the electromagnetic loss of the broadband giant magnetostrictive transducer when it is actually working normally, and quickly reflect different driving currents, driving frequencies and predicted Effect of stress on transducer amplitude permeability and electromagnetic losses.

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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