What Is a Piezoelectric Actuator?

Piezoelectric relay An electrical relay with a piezoelectric effect, that is, the mutual conversion of mechanical energy and electrical energy can be realized. Usually used in automated control circuits, it is actually an "automatic switch" that uses small currents to control high current operations. Therefore, it plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit.

Piezoelectric relays include: relay housings and piezoelectric actuators. By applying a strong enough voltage to the relay to make its polarization direction consistent with the direction of the electric field, when the external electric field is removed, there is still residual polarization in the relay. If the external action can change this polarization intensity, the relay generates voltage. Electrical effect.

Piezoelectric relay is an automatic switching element with isolation function. It is widely used in remote control, telemetry, communication, automatic control, mechatronics and power electronic equipment. It is one of the most important control elements.

Piezo relays can reflect certain input variables (such as current, voltage,

Using the improved PZT piezoelectric ceramic material, a piezoelectric ceramic coupler with a chip structure is developed, and it is used as an isolation device to replace the photoelectric coupler in the traditional solid state relay. It overcomes the problems of traditional MER and SSR. This kind of relay has the characteristics of small size, short on time, high trigger sensitivity, strong anti-interference ability, no electromagnetic radiation, long service life and so on.

The piezoelectric ceramic coupler is made of PZT (PbO ₃ , a PbTjO ₃ ) ceramic material. For the piezoelectric ceramic coupler should have the characteristics of good signal transmission characteristics and large output current, PZT piezoelectric ceramic materials are used to replace multiple An improvement of oxide doping was used to improve the piezoelectricity and dielectric properties of the material, and an improved PZT piezoelectric ceramic material with better performance was studied. ^[1]