Views: 3 Author: Site Editor Publish Time: 2019-07-23 Origin: Site
2. What is the piezoelectric ceramic on the piezo ceramic buzzer sheet? Ferrite core, is it a piezoelectric ceramic material?
Piezoelectric ceramics piezo disks crystal on piezo buzzer sheets, in particular, are made by using ordinary piezoelectric ceramics, but are relatively small in thickness. It is bonded to the metal to form a bending vibration for the purpose of use. As for the ferrite core, it is not a piezoelectric ceramic material. Because of the ferrite core, which is made of a ceramic structural non-metallic magnetic material, it can also be called a soft ferrite.
3. How to use polarized piezoelectric ceramics to become a transmitting transducer and a receiving transducer?
For piezoelectric ceramics that have been polarized, under the excitation of the periodic signal, stretching vibration can be generated to push the surrounding medium motion, thus forming a transmitting transducer. Further, it is driven by the medium, which generates stretching vibrations to generate electrical signals. At this point, it forms a receiving transducer.
This is actually not difficult to consider because of the boost inductor turns ratio for the piezo buzzer, which is highly dependent on the resonant frequency. Moreover, we must also consider the magnetic flux rate and the operating frequency. In addition, one thing to consider is that the higher the frequency, the higher is the inductance ratio. Therefore, these should be considered comprehensively.
The resonant frequency of a piezoelectric discs ceramic transducer sheet is mainly related to the size of the ceramic sheet, such as its thickness, and diameter. If the diameter is 10-25 mm, then the resonant frequency is 15-85 KHz. In addition, when it is connected, there are positive and negative requirements. If it is not noticed, the piezoelectric ceramic piece may not be used normally.
