Principle of transducer

A transducer is an energy converter device that converts input electrical power into mechanical power (i.e. ultrasonic) and transmits it, while consuming a small portion of the power (less than 10%) on its own. So, when using ultrasonic transducers, the consideration should be the matching with the input and output terminals, followed by mechanical installation and matching dimensions. There are various types of ultrasonic machinery on the market, and customers need to provide accurate and reliable indicators to ensure that the transducer products provided by the company can match your company's machines well and perform well. Due to the wide variety of transducers, this article only provides some transducer parameters.
① Resonant frequency:
f. Unit: KHz This frequency refers to the frequency measured using a frequency generator, millivolt meter, or similar instruments such as impedance characteristic analyzers through transmission line methods. Generally known as small signal frequency. The opposite of it is the operating frequency, which is the actual operating frequency measured by the customer when the transducer is connected to the drive power supply through a cable and powered on with no load or on load. Due to the different matching circuits of customers, the frequency displayed by the same transducer with different driving power supplies is different, and such a frequency cannot be used as a basis for ordering.
② Capacitance of transducer:
CT, unit: PF refers to the free capacitance of the transducer, which can generally be measured using a capacitor bridge at a frequency of 400Hz-1000Hz, or an impedance characteristic analyzer or similar instrument. Simply put, measuring with a general portable capacitance meter can also meet the requirements.
③ Working mode of transducer
Due to different processing methods and requirements, the working mode of transducers can be roughly divided into continuous operation (lace machine, CD cover machine, zipper machine, metal welding machine, etc.) and pulse operation (such as plastic welding machine). Different working modes have different requirements for transducers. Generally speaking, continuous work has almost no pause time, but the working current is not very high. Pulse work is intermittent and has pauses, but the instantaneous current is very high. On average, the power of both states is high.
④ Type and high-power of transducer
The manufacturer of the complete machine may have different regulations on the nominal power of machines for different purposes and purposes, in other words, the same transducer used on different machines may have different nominal power. To avoid ambiguity, the customer should provide a detailed explanation of the structural type of the transducer, such as column type, inverted horn type, etc., as well as the diameter and number of piezoelectric ceramic chips.
⑤ Installation and fitting dimensions
Mainly including the material, surface treatment method, and shape of the horn. The connection thread between the transducer and the amplitude converter, the connection thread between the amplitude converter and the mold, and the diameter, thickness, number and position of notches or screw holes at the flange of the amplitude converter.