Views: 5 Author: Site Editor Publish Time: 2018-05-08 Origin: Site
 75khz piezo discs transducer |  piezo discs crystal |  piezo discs transducer |
The PZT polarization piezo ceramics is not well controlled, and it is easy to make the piezoelectric constant and static capacitance of each cell in the area inconsistent,which is making the polarization parameters in the two regions A and B that is not completely symmetrical, and affecting the vibration amplitude of the surface of the stator of the ultrasonic motor. two test of PZT material 75khz piezo discs transducer results in the reverse order. PZT two static capacitance results in the reverse order. Each cell has 3 different piezoelectric films, which the three waves have a maximum error of 4.0% and the four waves have a maximum error of 10.3%, which is related to the manufacturing process of the piezoelectric film, such as a piezoelectric film. Before sintering,it is the uniformity of material mixing, the strength of the electrode polarization voltage and so on.
The static capacitance of each polarization zone of PZT is also not the same, and the static capacitance before and after the piezo-electric plate changes greatly, these piezo discs transducer have a greater impact on the vibration characteristics of the stator of the ultrasonic motor. Piezoelectric chip test results were averaged and the original test values were taken, and the axial amplitude and the maximum tangential velocity of the modal stator teeth are calculated in the finite element model were calculated. The input voltage was 100 V.When the parameters of each pole PZT material piezoceramic rings are not uniform, the axial amplitude and the maximum tangential speed of the stator teeth are also unstable, and the output performance is not optimal. When the stator vibration amplitude and the tangential maximum speed are both uniform, the amplitude decreases.
About 6.4% of the PZT's dielectric loss energy of the motor is operating under high voltage and high frequency conditions above 20 kHz. cheap piezo discs crystal generate much more heat due to dielectric losses. At the same time, the domain wall vibration in the multi-domain piezoelectric body lags microscopically, and the energy is consumed by the frictional compression between the wall, the wall is generated. Finally, it is consumed in the form of heat, and the stator temperature of the motor is increased. The dielectric loss energy of a unit volume of piezo discs matter dispersion driven by high voltage and high frequency. The dielectric loss coefficient of piezoelectric ceramic can be seen in the piezoelectric ceramics. The dielectric loss energy of PZT is not only Its structure size, material properties, but also with the frequency and amplitude of the excitation voltage.
