The winding in which voltage is induced is called the armature winding. 產生感應電壓的繞組稱為電樞繞組。
When resonance happens,the induced voltage will reach to its maximum value.Tracking the maximum value can realize the frequency autotracking. 諧振時，感應電壓達到最大值，搜尋感應電壓最大值就能實現頻率自動跟蹤。
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