What happen if AC Supply willl given to a DC Motor ?

Question

If we will supply 220VAC to a DC Motor of rating 220VDC.

Answer 1

it depends on how the DC motor is modulated. Usually a DC motor needs a speed controller to initiate the commutation of the windings because DC doesn't have phases like AC. More than likely, the motor would just buzz or vibrate, but it wouldn't spin. It'd also get pretty hot or it would start arcing across the brushes because the current would have nowhere to go.

Answer 2

It depends on the construction of the motor. If the field winding is connected in series with the armature winding, the motor is like a universal motor and will probably operate normally. If the field winding is connected in parallel with the armature, the motor will not run, but will draw current, make noise and get hot.

Edit 1

Shunt wound DC motors are not suitable for AC operation because the difference in inductance between the armature and the field causes a relative phase shift between the armature current and the field current. For a DC motor to operate with AC current, the armature and field currents must reverse at exactly the same time, as they do when the windings are connected in series. For reasonably good performance, the cores need to be laminated and the brush position needs to be set to 90 degrees.

Answer 3

It will rotate back and forth at 60Hz

Answer 4

A universal motor is a dc motor modified to operate on AC.

There are different types of DC motors. A permanent magnet dc motor will not work with a AC supply.

Both series and parallel wound field dc motors have windings for the field. Since in AC both the armature and the field will change polarity at the same time the motor will turn if AC is applied. The problem with a DC motor not made for AC is that the core of the field may not be made of laminations since there would be no eddy current induced in it when supplied with DC. When AC is applied eddy current would be induced in the core causing power losses and extra heating. A universal motor has a field core with laminations.