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超聲波換能器産品選用說明（一）

返回列表 來源：发布日期： 2021.03.14

衆所周知，超聲波換能器是一种能量转换器件，它的功能是将输入的电功率转换成机械功率（即超聲波）再传递出去，而它自身消耗掉很少的一部分功率（小于10%）。所以，使用超聲波換能器最应考虑的问题就是与输入输出端的匹配，其次是机械安装和配合尺寸。換能器与机器必须良好匹配，发挥最佳性能。

1、谐振频率：f，单位：KHz

該頻率是指用頻率發生器，毫伏表等通過傳輸線路法測得的頻率，或用阻抗特性分析儀等類似儀器測得的頻率。一般通稱小信號頻率。與它相對的是上機頻率，即客戶將換能器通過電纜連到驅動電源上，通電後空載或有載時測得的實際工作頻率。

2、換能器電容量：CT，單位：PF

即換能器自由電容，一般可用電容電橋在400Hz-1000Hz的頻率下測得，也可用阻抗特性分析儀類似儀器。再簡單點，用一般的便攜式電容表測量也可滿足要求。

3、換能器工作方式

因加工方式和要求不同，超聲波換能器的工作方式大致可分为连续工作（花边机，CD套机，拉链机，金属焊接等）和脉冲式工作（如塑焊机），不同的工作方式对換能器的要求是不同的。一般而言，连续式工作几乎没有停顿时间，但工作电流不是很大，脉冲工作是间歇式的，有停顿，但瞬间电流很大。平均而言，两种状态的功率都很大的。

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超聲波換能器産品選用說明（一）

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