Outer diameter: 45mm
Inter diameter: 15mm
Application: Ultrasonic welding machine
A large stock
P8 material is necessary for making transducers.
The Qm value as higher as better of the manufactured transducer, but the high Qm is the contribution of the small resonance impedance R, so the effect is good, so the smaller R is the better.
The transducer needs suitable circuit matching. The fixed frequency line must always be excited at the resonance point of the transducer, so that the force of vibration is the largest, and the excitation oscillation impedance that deviates from the resonance frequency point will become larger, and the actual Qm value decreases, and the output will not be good. At the same time, piezoelectric ceramics have frequency and capacitance temperature coefficients.
After the transducer works, the temperature will increase, the frequency of BlackRock P8 ceramic will increase, and the capacitance will also increase, and the capacitor will participate in the circuit to change the capacitance.
The total amount changes the oscillation frequency F0 of the circuit, so the oscillation frequency of the circuit can be excited at the resonant frequency point of the transducer through fine-tuning after dynamic operation or temperature rise, so that the welding machine can ensure a large output, not easy to heat, resistant Hit, such a transducer is of good quality.
There is also the capacitance CT, which cannot be too small, nor too large, too large, indicating that the dielectric constant is large, the dielectric constant is large, the strong field loss will be large, it is easy to generate heat, and the insulation of the heating ceramic will decrease , The applied power and electrical performance will be missed, and the output will be small; if it is too small, the piezoelectric strain constant d33 will be small, the deformation amount under the action of the applied electric field is less, and the energy generated is less, then the Q value puts this The energy sent to the instant will be small, and the welding effect of the welding machine will be not well.