现功率超声技术已被大范围应用, 在实际加工中, 其振动实现器件换能器的工况取决于外接负载阻抗的大小变化以及加工过程中换能器的温度变化;随着负载变化, 换能器的谐振频率也将发生改变, 导致与发生器输出频率不匹配, 从而对换能器的输出振幅及加工效率产生负面影响.为得到规律, 分别使用换能器的理论设计、仿真以及试验方法研究了轻负载下外接电感对换能器谐振频率的影响.结果表明:随着换能器变幅杆伸入水中长度的增加, 换能器的谐振频率呈上升态势;通过外接调谐电感, 换能器谐振频率会得到一定量的补偿, 使其重新回到预先设定的频率值;随着外接电感值的增大, 换能器的谐振频率会下降.可见使用电感负载可以有效解决换能器外接负载导致的频率漂移问题.%The current power ultrasonic technology has been widely applied. In actual machining, the working condition of vibration realization device transducer depends on the magnitude of the external load impedance and the temperature change of the transducer during the machining process. The resonant frequency of the transducer will also change, resulting in a mismatch with the output frequency of the generator, which will have a negative impact on the output amplitude and processing efficiency of the transducer. In order to obtain the rule, design theory of transducers, simulation and test methods were used to investigate the effects of the external inductor at light loads the resonant frequency of the transducer the influence of external inductance on the resonant frequency of the transducer under light load. The results show that the resonant frequency of the transducer increases with the increase of the length of the transducer horn into the water. By switching in a tuning inductor, the resonant frequency of the transducer will be compensated by a certain amount, so that it can be returned back the preset frequency value. As the value of external inductor increases, the resonant frequency of the transducer will decrease. It is concluded that the use of inductive load can effectively solve the frequency drift caused by the external load of the transducer.
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