本文目录一览:
- 1、电风扇电容一般多大的?
- 2、如何选择电风扇的电容
- 3、电风扇里的电容有什么作用????
电风扇电容一般多大的?
家用电风扇的启动电容一般1--2μF,多数1.2μF。一般来说,电容感应式电机有两个绕组,即启动绕组和运行绕组,两个绕组在空间上相差90度。
如何选择电风扇的电容
1、因为电风扇也有不同的功率,所以选择的电容大小也不一样。市面上出售的电容型号有很多,如果你家的电风扇功率是40瓦的,可以选择的电容型号在1~1.5uf之间。
2、如果功率稍微大一些,电风扇达到了70瓦左右,电容就要大一些,选择2uf的。还有一种电风扇功率达到了180瓦,可能是吊扇,选择的电容就是3uf。
3、选择的时候一定要注意电容不能够太大,要不然就会损坏电机。但是如果电容太小,又会使得电风扇转动不起来,一般来说,不要超过20%就可以。
4、我们在购买的时候,电容上面会有明显的标志,比如会有cbb61,这就代表的是它的型号,上面还有4.5uf,表示它的容量。加减正负5%,说明是它的容量误差,只要在这个范围之内都是可行的。
从上述内容得知,我们应该按照电风扇的功率来选择不同的电容,选择的时候千万要在合理的范围之内。
电风扇里的电容有什么作用????
风扇电容一般分为启动电容和工作电容两类。启动电容是在电动机启动时辅助电机启动,当电机启动后就不起作用了;工作电容是在辅助电机启动之后仍然协助电机运行,即仍然起作用。电风扇的电容一般是都启动电容。
因为电风扇大多是单相的,而直接用单相电无法产生一个足够的启动磁场,也无法维持良好的运转 。所以这种电动机一般都有两个绕组,就是主绕组和辅助绕组 。主绕组直接并入电路,辅助绕组经过电容器后串入电路 。这样辅助绕组就有一个角度差 。而电容器则起到移相的作用,让相位出现一个偏离,这样相当于获得了2相电,而且相位不同,就可以将转子启动起来,然后主绕组维持磁场让他运转, 辅绕组继续推动,使其不因为外力作用而停下来。
扩展资料:
电容在电路中的作用:
1、耦合:用在耦合电路中的电容称为耦合电容,在阻容耦合放大器和其他电容耦合电路中大量使用这种电容电路,起隔直流通交流作用。
2、滤波:用在滤波电路中的电容器称为滤波电容,在电源滤波和各种滤波器电路中使用这种电容电路,滤波电容将一定频段内的信号从总信号中去除。
3、退耦:用在退耦电路中的电容器称为退耦电容,在多级放大器的直流电压供给电路中使用这种电容电路,退耦电容消除每级放大器之间的有害低频交连。
4、高频消振:用在高频消振电路中的电容称为高频消振电容,在音频负反馈放大器中,为了消振可能出现的高频自激,采用这种电容电路,以消除放大器可能出现的高频啸叫。
5、谐振:用在LC谐振电路中的电容器称为谐振电容,LC并联和串联谐振电路中都需这种电容电路。
6、旁路:用在旁路电路中的电容器称为旁路电容,电路中如果需要从信号中去掉某一频段的信号,可以使用旁路电容电路,根据所去掉信号频率不同,有全频域(所有交流信号)旁路电容电路和高频旁路电容电路。
7、中和:用在中和电路中的电容器称为中和电容。在收音机高频和中频放大器,电视机高频放大器中,采用这种中和电容电路,以消除自激。
8、定时:用在定时电路中的电容器称为定时电容。在需要通过电容充电、放电进行时间控制的电路中使用定时电容电路,电容起控制时间常数大小的作用。
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