Piezoelectric ultrasonic transducer (power: cleaning, welding, atomizing)

01

Match the frequency and power to the application

Sonerc's cleaning transducer listing includes these five bolt-clamped examples: 28 kHz at 100 W and 60 W, a dual 28/40 kHz unit at 60 W, and 40 kHz units at 60 W and 50 W, each with a ±1 kHz frequency tolerance. It explains that the power is determined by the size of the piezo ring, so a 60 W unit is smaller than a 100 W unit, and lists applications from heavy-duty parts cleaning and metal degreasing at 28 kHz to circuit board and general cleaning at 40 kHz. [1]

Minyang’s transducer listing includes 15, 20, 28, 35 and 40 kHz welding-transducer models; select the converter and generator as a matched configuration rather than inferring interchangeability from frequency alone. [2]

FBelec lists 20 mm atomizer discs with 108 kHz and 111 kHz descriptions, and 13.8 mm products with 160K and 180K model codes. One row names FBPZT13.8-180K 5UM but its description says 160 kHz; confirm the operating frequency with FBelec before specifying that variant. The listing also uses 4–12 µm product-version labels; confirm whether they describe mesh openings or a defined droplet measurement rather than assuming a mist-size specification. [3]

Give the supplier the application (cleaning, welding or atomizing), frequency and tolerance, power per transducer, the generator model or its output impedance, mounting method (bonding, bolting or horn interface), operating temperature and duty cycle, and for atomizing discs the diameter, frequency, mesh or micron rating and liquid.

02

Check resonant impedance, capacitance, insulation, size and weight

For the five named cleaning examples above, Sonerc lists resonant impedance of ≤15 Ω, capacitance of 9,000 pF ±10% for the 100 W 28 kHz unit, 5,500 pF ±10% for the 60 W units and 4,500 pF ±10% for the 50 W unit, insulation resistance of 5,000 MΩ, weights from 200 g (50 W, 40 kHz) to 730 g (100 W, 28 kHz), and dimensions of 35 × 45 × 51 mm for Q50W-40K and 50 × 69 × 67 mm for Q100W-28K. [1]

Sonerc lists Q100W-28K at 730 g and Q60W-40K at 230 g; its two single-frequency 60 W models, Q60W-28K and Q60W-40K, weigh 450 g and 230 g respectively. These are individual catalogue-model masses; they do not establish installed tank mass or equal cleaning performance at equal nominal power. [1]

Minyang describes its welding transducers as having low resonant impedance, a high mechanical quality factor, high electro-acoustic conversion efficiency and low heating. [2]

Editorial note: transducers are driven at resonance by a matched generator, so ask for impedance and capacitance tolerances and whether units are matched in sets for multi-transducer tanks.

03

Ask how the bolt preload was set

A Kwangwoon University study describes a Langevin transducer designed for 38 kHz, with four PZT-4 rings each 2.5 mm thick, an aluminium front mass and a stainless-steel bolt. Table 3 gives measured resonance/anti-resonance of 37.71/38.83 kHz at 6.0 N·m, 38.32/39.42 kHz at 8.0 N·m and 38.62/39.77 kHz at 10.0 N·m. These are results for the study assembly and test method, not supplier assembly-torque settings. [4]

The Figure 3 discussion reports measured impedance of 35 Ω / 18 kΩ at resonance / anti-resonance for 6.0 N·m. The Figure 4 discussion gives 22 Ω / 33 kΩ for 8.0 N·m and 17 Ω / 34 kΩ for 10.0 N·m. Separately, the Figure 5 discussion describes the endpoints from 6.0 to 10.0 N·m as 36 to 18 Ω at resonance and 19 to 40 kΩ at anti-resonance. Both reported sets are retained here; ask the authors to clarify the measurement/reporting basis before applying these values. [4]

For effective coupling at 8.0 N·m, the Figure 4 discussion gives 0.235 for the equipment test, while Table 3 gives mean 0.238 with standard deviation 0.002. Its later coupling discussion also associates values with Table 2/3 differently from the tables’ simulation/measurement headings. Use the location-specific values and confirm the distinction with the authors. Table 3 means for 6.0 and 10.0 N·m are 0.236 and 0.239 respectively. [4]

The authors identify their smallest model/measurement impedance gap at resonance at 8 N·m and discuss 50 Ω peripheral instruments. They offer possible depolarisation as an explanation for the modelled coupling trend above 8.5 N·m. These statements concern that experimental arrangement; specify bolt-preload method and measured resonance for the actual supplied transducer. [4]

04

Piezo stack, metal masses and generator connections

05

Converter frequency and generator-matching data

06

Send the application, frequency and generator data together

Paste it into your enquiry below or into an email to a maker, then replace every bracket.

Application: [cleaning tank, welding, atomizing]
Frequency: [kHz; tolerance]
Power: [W per unit; units per tank]
Electrical: [impedance; capacitance; insulation; matched sets]
Generator: [model; output]
Mechanical: [size; weight; mounting; horn thread]
Atomizing: [disc diameter; micron rating; liquid; output]
Volume: [quantity]

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