【摘要】 针对换能器在加工过程中因温度升高与负载变化导致的谐振频率偏移问题，采用最小阻抗法与相位差控制法相结合的谐振频率识别策略，利用基于DSP控制的恒流超声电源样机测试了电源谐振频率识别的精确性与一致性。结果表明：超声电源识别出的换能器谐振频率与阻抗分析仪测得的谐振频率最大差值为25 Hz、误差小于0.1%；激光测振仪测得振幅最大时的谐振频率与超声电源识别的谐振频率最大相差24 Hz；使用超声电源多次测试三种负载下的换能器，相同负载下识别出的换能器谐振频率波动范围在15 Hz以内。更多还原

【Abstract】 In order to solve the problem that the resonant frequency of transducer is shifted due to temperature rise and load change during processing,this paper uses the resonant frequency identification strategy combining the minimum impedance method and the phase difference control method,and tests the accuracy and consistency of the resonant frequency identification of the power supply by using a constant-current ultrasonic power supply prototype controlled by DSP. The test results show that the maximum difference between the resonant frequency of the transducer identified by the ultrasonic power supply and the resonant frequency measured by the impedance analyzer is 25Hz,and the error is less than 0.1%. The maximum difference between the resonance frequency measured by laser vibrometer and the resonance frequency identified by ultrasonic power supply is 24Hz. The ultrasonic power supply was used to test the transducers under three different loads for many times,and the resonance frequency fluctuation range of the transducers identified under the same load was within 15 Hz.更多还原