Transformer and Motor Windings

The answer is within question.Why?

Transformers are not supposed to be connected to DC.

There's clearly something wrong with the design if the transformer has been installed, let alone if it has burnt!

When DC source is applied to DC motor, the rotor starts rotating and the rotating field creates a counter voltage called 'Back emf' (E_b) in the stator winding. This Back emf prevents the motor winding to be short circuited. See these sites for DC motor theory:

http://electricalandelectronics.org/2009/09/04/back-or-counter-e-m-f

http://www.emailschool.com/Services/Courses/The_DC_Motor.pdf

http://www.pc-control.co.uk/dc-motors.htm

http://www.animations.physics.unsw.edu.au/jw/electricmotors.html

For the case of transformer, there is no Back emf and the windings are almost short circuited when DC is applied.

- MS

Dear Guest,

Your question is like this- There are two persons . One can take sugar and

there is no ill effect. The other person can also take sugar but will suffer with

adverse reactions / ill effects. Why ? This depends upon their conditions as between

a Transformer & a motor when both are fed in a similar manner. source-DC

Kindly let us use our brains & do post some good problems . People here

are not expected to answer any INTERVIEW Questions !!

Manroop.Chennai.