Blister 3 sides edge hemming machine

　　1. Parameters

　　1) Mechanical resonance frequency (Fs)

　　This refers to the operating frequency of the vibration system, which should be designed as close as possible to the expected value and must be matched with the power supply operating point.

　　2) Dynamic resistance (R1)

　　The smaller the resistance of the piezoelectric oscillator series branch under the same supporting conditions, the better! For cleaning or welding oscillators, it is generally between 5 Ω -20 Ω. If it is too large, there may be problems with the operation of the oscillator or vibration system, such as circuit mismatch or low conversion efficiency, short oscillator life, etc.

　　3) Mechanical quality factor (Qm)

　　Determined by the conductivity curve method, Qm=Fs/(F2-F1), the higher the Qm, the better, because the higher the Qm, the higher the efficiency of the oscillator. But Qm must be matched with the power supply. When the Qm value is too high, the power supply cannot be matched. For cleaning the oscillator, a higher Qm value is better. Generally speaking, the Qm for cleaning the oscillator should be between 500-1000. If it is too low, the oscillator efficiency is low, and if it is too high, the power supply cannot be matched. For ultrasonic welding or processing, the Qm value of the oscillator itself is generally around 50-1000, and the overall system is between 1500-3000. If it is too low, the vibration efficiency is low, but it cannot be too high because the higher the Qm, the narrower the working bandwidth, and the power supply is difficult to match. That is to say, the power supply is difficult to work at the resonant frequency point, and the equipment cannot work normally.

　　4) Free capacitance (CT)

　　The capacitance value of piezoelectric devices at a frequency of 1kHz is consistent with the value measured by a digital capacitance meter. Subtracting the dynamic capacitance C1 from this value yields the true static capacitance C0, which equals CT-C1. When using it, it is necessary to balance C0 with an inductor. In the circuit design of ultrasonic machining machines, correctly balancing C0 can improve the power factor of the power supply. There are two methods for using inductor balancing: parallel tuning and series tuning.

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