What is the principle of piezoelectric ultrasonic transducer?

1. Ultrasonic transducer is a component that converts electrical energy into mechanical vibration and amplifies the amplitude, mainly including ultrasonic transducer, ultrasonic amplitude transformer and ultrasonic welding head. The working principle of ultrasonic transducer on ultrasonic plastic welding machine is to use the inverse piezoelectric effect of piezoelectric ceramic material to generate vibration.
2. Place a piezoelectric crystal in an external electric field. Under the action of the electric field, the center of gravity of positive and negative charges inside the crystal moves. This polarization displacement causes the crystal to deform. This is called the inverse piezoelectric effect.