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什么是发电机的自励磁?自励磁有何条件?

问答题
2022-01-04 23:50
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正确答案

要使发电机正常的发电,发电机转子磁极必须有一定的磁场强度。但是任何发电机或励磁机在刚启动时,磁极剩磁都很弱,因此在发电机旋转起来以后,其磁场要经过一个由弱变强的过程,才能在空载状态建立额定电压,这个过程就是自励磁过程。能够自励的条件之一是发电机转子转速要达到额定转速,而且要有一定的剩磁,条件之二是流过磁极线圈的电流必须能加强剩磁,而不是削弱它。


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