The winding in which voltage is induced is called the armature winding. 产生感应电压的绕组称为电枢绕组。
When resonance happens,the induced voltage will reach to its maximum value.Tracking the maximum value can realize the frequency autotracking. 谐振时，感应电压达到最大值，搜寻感应电压最大值就能实现频率自动跟踪。
