5 Ways To Get Through To Your piezoelectric plate sensor

     5 Ways To Get Through To Your piezoelectric plate sensor

ultrasonic motor as ultrasonic wave type is currently the most representative and most applied type of ultrasonic motor. Its operating mechanism profoundly reveals the relationship between standing wave and traveling wave of 30khz piezoelectric plate,it is energy conversion and transfer process. The structure diagram of the wave type ultrasonic motor is mainly composed of a stator, a rotor, piezoelectric ceramic has a friction material base. The stator is composed of a piezoelectric ceramic element and an annular elastic body bonded together. When an alternating voltage of 120 kHz or more is used, the inverse piezoelectric effect converts electrical energy into mechanical motion and excites tens of kilohertz of ultrasonic vibration in the elastic body. 

The microscopic vibrations sensor of the piezo sound sensor are formed on the surface of the elastomer (the amplitude is generally several micrometers). The friction PZT material is on the rotor's adhesive layer (friction village book), the use of friction materials is to generate friction to the mechanical energy amplification, the role of the rotor through its own structural deformation on the stator will be subject to the traveling wave propagation direction .The opposite friction of piezoelectric plate energy harvesting ensures good contacting between stator and rotor. In this way, the rotor is continuously rotated in one direction in practical applications, the stator has slots on the surface. It has two functions: One is to amplify the amplitude of vibration sensor generated by the surface of the piezoelectric plate transducer so that it can be transferred to obtain a larger output energy; the other is to introduce friction induced powder into the slot.

The traveling-wave type ultrasonic power relies on the vibration of the stator to drive the movement of the rotor. The stator is composed of a piezoelectric ceramic ring and a metal elastic body. The piezoelectric ceramic ring is divided and polarized to form two left and right phase areas, when frequency and amplitude is applied to them. When the values of piezoelectric plate acoustic sensor are the same and the phases are different by the sine wave electric signal of rd2, the piezo ceramic vibrations in the two phase regions are different by phase, and the elliptic motion in the circumferential direction is formed on the surface of the stator.