At present there are two fundamentally different methods of conversion of high-frequency electric oscillations in mechanical ones. The processed is carried out either with piezoceramic or magnetostrictive transducers (emitters).
Piezoceramic transducers are based on the properties of the piezoelectric crystals which change their shape under the influence of an electrical voltage.
The operating principle of magnetostrictive transducers are based on the phenomenon of electromagnetic induction. These devices represent an induction coil within which the moving core is formed. Both types of radiators have their advantages and disadvantages. Hilsonic experts, the company concentrating its effort on ultrasonic cleaner equipment production have worked hard to assess both technologies… and this is why they chose the piezoceramic devices.
Piezoelectric transducers demonstrate unsurpassed effectiveness due to the mechanism of action: electrical energy is converted into mechanical energy directly. The energy loss percentage in the ceramic typically doesn’t exceed 5%. This means that 95% of the electrical energy supplied by the transducer, is to perform a useful function (cleaning). Contemporary ultrasound generators used in conjunction with piezoceramic radiators have an efficiency of at least 70%. Magnetostrictive systems operate on the basis of dual-energy conversion, which inevitably leads to a decrease in efficiency. Electric effect converted into a magnetic field and then to mechanical energy. Energy losses due to the effectiveness of magnetostrictive emitters do not exceed 50%. Generators designed to supply magnetostrictive transducers with power, even with a good tune, basically have an efficiency greater than 70%. (more…)