The longitudinal-torsional composite mode ultrasonic transducer is studied. The transducer consists of the front and back exponential metal horns, and the axially and tangen-tially polarized piezoelectric ceramic pile...The longitudinal-torsional composite mode ultrasonic transducer is studied. The transducer consists of the front and back exponential metal horns, and the axially and tangen-tially polarized piezoelectric ceramic piles. The resonance frequellcy equations fo f the longitu-dinal and torsional vibrations in the transducer are derived. By changing the cross sectional radius decny coefficient of the exponeotial metal horns, the longitudinal and torsional vibrations in the transducer could resonate at the same resonance frequency Experimental results show that the measured resonance frequency is in good agreement with that of theoretical results, and the resonance frequency for the longitudinal vibration is basically the same as that for the torsional vibration in the transducer. This kind of transducer could be used in ultrasonic processing and other high power ultrasonic technologies.展开更多
设计了一种直线压电电机采用一阶纵振工作模态。电机振子由横、纵向杆式振动体正交连接而成,振动体的结构形式为高强度夹心换能器,横向振动体的两个换能器产生反对称振动以增强横向振动输出力。当横、纵向振动体施加相位差为90°的...设计了一种直线压电电机采用一阶纵振工作模态。电机振子由横、纵向杆式振动体正交连接而成,振动体的结构形式为高强度夹心换能器,横向振动体的两个换能器产生反对称振动以增强横向振动输出力。当横、纵向振动体施加相位差为90°的正弦激励信号时,驱动足产生椭圆运动以推动滑条移动。通过扫频实验,测得电机的最佳工作频率为29. 3 k Hz。当给电机施加频率为29. 3 k Hz,峰峰值为250 V的激励信号时,滑条的推动力可达8N,空载移动速度可达150 mm/s。展开更多
文摘The longitudinal-torsional composite mode ultrasonic transducer is studied. The transducer consists of the front and back exponential metal horns, and the axially and tangen-tially polarized piezoelectric ceramic piles. The resonance frequellcy equations fo f the longitu-dinal and torsional vibrations in the transducer are derived. By changing the cross sectional radius decny coefficient of the exponeotial metal horns, the longitudinal and torsional vibrations in the transducer could resonate at the same resonance frequency Experimental results show that the measured resonance frequency is in good agreement with that of theoretical results, and the resonance frequency for the longitudinal vibration is basically the same as that for the torsional vibration in the transducer. This kind of transducer could be used in ultrasonic processing and other high power ultrasonic technologies.
文摘设计了一种直线压电电机采用一阶纵振工作模态。电机振子由横、纵向杆式振动体正交连接而成,振动体的结构形式为高强度夹心换能器,横向振动体的两个换能器产生反对称振动以增强横向振动输出力。当横、纵向振动体施加相位差为90°的正弦激励信号时,驱动足产生椭圆运动以推动滑条移动。通过扫频实验,测得电机的最佳工作频率为29. 3 k Hz。当给电机施加频率为29. 3 k Hz,峰峰值为250 V的激励信号时,滑条的推动力可达8N,空载移动速度可达150 mm/s。
