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A DC motor starts to over speeding, can you find out the why ?

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Question added by LABIB KOOLI , Director of the Sectoral Center for Training in Hotel Technologies at Southern Hammamet , Tunisian Vocational Training Agency (ATFP)
Date Posted: 2014/10/28

The armature resistance is very low.At the starting of a DC motor since there is no back EMF in the armature,the entire terminal voltage acts across the armature. Hence,the armature draws more current.

Safi Ullah
by Safi Ullah , Electrical Trainee Engineer , PESCO (Peshawar Electric Supply Company)

Supply may increase...................................................

yes, the shunt winding goes open circuit, or the load dissapeared

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