Overview of frequency tracking control method of ultrasonic welding machine

The transducer of ultrasonic welding machine has a certain impact on the quality of welding. If it vibrates at the resonance frequency without load, it can be regarded as almost pure resistance. However, once under load, the actual working frequency of the ultrasonic automatic welding machine will be different from the resonant frequency of the power supply, and the welding effect will become lower. Different from the hot plate welding machine, the influence of welding frequency on it is relatively direct. Today, let's learn about the frequency tracking control method of ultrasonic welding machine and see how to improve the welding quality.

In order to track and control the frequency of ultrasonic welding machine, the phase detection method should be used to detect the voltage and current of the equipment. We record the corresponding voltage and current data of the transducer in the harmonic state and non harmonic state, and analyze it by phase detection method. Through the relevant data of the above ultrasonic automatic welding machine, we can know the phase difference between the transducer voltage and current and the lag or lead, which are reflected in the relationship between the working frequency and the vibration frequency. Then through the linear analysis of the effect of electric field and magnetic field, it is concluded that by changing the voltage of the coil, changing the magnetic field, so as to change and adjust the working frequency, the frequency of the ultrasonic welding machine can be controlled to return to the resonance point. After checking the direction and size of the phase difference between the voltage and current of the transducer, it can be used as a basis for adjusting the frequency. Although this seems more complex than using the hot plate welding machine, as long as you can master the control of this frequency, the welding effect will be improved.

The above is an overview of the frequency tracking control method of ultrasonic welding machine. Through the analysis of phase detection method and electric and magnetic field effect, we come to the conclusion that the phase difference of the transducer needs to be taken as the basis. By changing the frequency through the control circuit, the transducer of the ultrasonic automatic welding machine can work in a non load state and reduce the damage to the machine, which can be as simple and convenient as using the hot plate welding machine. I hope the above research on the frequency tracking method can give you a reference to continuously optimize the frequency control of ultrasonic welding machine and improve the working efficiency of welding machine.