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Round Durable Piezo Ceramic Element Testing

  • FT-31T-4.0A1


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Let's first talk about the Piezo ceramic element. ThePiezo ceramic element is made of silver metal, as shown in the physical image below. Some of them do not come with welding cables, and mainly rely on two vibrating plates to convert electrical energy into mechanical energy when powered on, thus making sound.

The principle of the occurrence of the Piezo ceramic element is as follows, with the help of an engineer from FBELE company's explanation:

The sound source of the piezoelectric buzzer sound component mainly comes from the piezoelectric vibration plate. The piezoelectric vibration plate consists of a piezoelectric ceramic plate with electrodes printed on both sides and a metal plate (such as brass or stainless steel). Using adhesive, the piezoelectric vibration plate and metal sheet are bonded together, which is commonly known as the Piezo ceramic element.

piezo element-1

Figure 2 shows the oscillation system of a piezoelectric vibration plate. When a direct current voltage is applied between the two electrodes of a piezoelectric vibration plate, mechanical deformation occurs due to the piezoelectric effect. For piezoelectric components with distorted shapes, their deformation extends in the radiation direction.

The piezoelectric vibration plate bends in the direction shown in Figure 2 (a), while the metal sheets bonded to the piezoelectric vibration plate do not extend. On the contrary, when the piezoelectric component contracts, the piezoelectric vibration plate will bend in the direction shown in Figure 2 (b). Therefore, when the AC voltage passes through the electrode, as shown in Figure 2 (c), the bending shown in Figure 2 (a) and Figure 2 (b) will alternate and repeat, generating sound waves in the air.

Generally speaking, the sound frequency range of a person is approximately between 20Hz and 20kHz. The most audible audio frequency for people is from 2kHz to 4kHz. Therefore, the vast majority of piezoelectric sound components are applied within this audio frequency range. Meanwhile, the resonant frequency (f0) of the buzzer is generally selected within the same range. As shown in Figure 3, the resonant frequency depends on the method used to support the piezoelectric vibration plate. If the shape of the piezoelectric vibration plate is the same, its values will decrease in the order of (a), (b), and (c).


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