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If a DC motor is connected to AC supply what will happen then?

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+1 vote
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in DC Machines by (506k points)
If a DC motor is connected to AC supply what will happen then?

(a) Not run

(b) Burn

(c) Run at normal speed

(d) Run at extremely low speed

The question was asked in semester exam.

Query is from Construction in division DC Machines of DC Machines

1 Answer

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Right answer is (b) Burn

Easiest explanation: If a DC motor is connected to AC supply, an alternating current pass through the brushes and commutator to the armature winding, while it passes through the commutator it is converted into DC so that the group of conductors under successive field poles carry current in same direction. So, the flux per pole will remain constant and not vary. There will be production of heat due to flow of eddy current in field winding and the motor will be burned.

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