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                      电磁蜂鸣器的工作原理是什么北京11选5走势图果?

                      文章出处:汉得利责任编辑:蜂鸣器人气:发表时间:2017-06-15 14:42字体: [ ]

                      蜂鸣器的磁环提供一个永磁场,金属导磁合金膜片置于磁环顶部,磁环内部有绕制在铁芯上的线圈,当交流信号(Vo-p)通过线圈而产生一交变的磁通北京11选5走势图果,交变的磁通和磁环恒定磁通进行叠加,使振动片以给定的交流信号频率振动并配合共振腔发声。

                      无源蜂鸣器工作信号是交变的磁场信号,所以需要的电压也是交变的电压,恒定的直流电信号只能产生一个磁场信号,所以是无法驱动无源蜂鸣器发声的北京11选5走势图果。

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