网上下载了风扇调速电路,里面的电容怎么调速?图有问题?
这个风扇里面的电容怎么调速?网上查了下,启动电容是不起调速作用的,有点搞不懂如L接1 时:启动绕组回路中没有电容联通,即没有启动电容,电机怎么启动呀? 不是有个4uF的电容吗? L接1 时,交流电直接到aux( 启动绕组),4 uf 电容与主绕组连接,也就是说4uf 电容没有通过启动绕组呀? 这是一个依靠电容分压调速的电路。5u比10u阻抗要大,分压也大,所以转速最低。
线路图运行绕组和辅助绕组(也称启动绕组)好像标反了,或者是1的连线应当接到4u电容的另一端,即在4u电容和两个5u电容之间。 电容降压调速,有点怪,好象开关上“1”脚的连线应接到4uF启动电容的左边。那么。
高速:L-1-2-3通,正常运转。
中速:L-2-3通,串入10uF电容运转。
低速:L-3通,串入5uF电容运转。
俺有点想当然。 应该是换档时,原来的主副绕组也发生改变,原主绕组变成副绕组,原副绕组变成主绕组。我不是搞电机的,瞎蒙 工作原理圖: 怎么一会儿主绕组,一会儿又变成副绕组? Most ceiling fans use a type of motor known as a "permanent split capacitor motor". These motors have two coils, a "start" and a "run" winding. A capacitor is connected in series with the start winding to insert a phase shift, but once the motor is up to speed it becomes an auxiliary winding. In order to reverse the motor, the capacitor is applied to the "run" winding which then becomes the "start" winding. In some cases the windings may have taps to provide different speeds, in others the value of the start/run capacitor is lowered to provide lower speeds. Yet other designs will have additional capacitors wired in series with the motor as a whole to regulate speeds.这个应该说明了线圈可变化
页:
[1]