| On-line measurement of electrical variables of the transducer during ultrasonic welding and cutting |
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| 作者姓名： | 闫久春 刘井权 杨士勤 |
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| 作者单位： | State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin ,150001 |
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| 摘 要： |
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| 关 键 词： | 超声波焊接 超声切割 在线测量 电参数 |
On-line measurement of electrical variables of the transducer during ultrasonic welding and cutting |
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| Abstract: | A measurement system for high power electrical variables with ultrasonic frequency was established. It can measure the effective values of the voltage and the current, the active power, the phase difference of voltage and current, the frequency of the transducer during ultrasonic welding and cutting. In sampling circuits of the system, the measured current is sensed by using a no-capacitance and no-inductance precision resistor and is treated with a difference amplifier, the measured voltage is processed by using a proportional amplifier. For achieving good amplitude-frequency characteristics and rapid measurement of high frequency signals, the resistors, capacitors and amplifiers used in the system are rationally selected. Calibrating experiments show that relative errors are less than 1% for voltage and current effective values and less than 2.5% for active power, and absolute errors are ±1 Hz for frequency and ±1.7°for phase difference of voltage and current in the range of 17～23 kHz. |
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| Keywords: | ultrasonic welding ultrasonic cutting on-line measurement electrical variables |
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