what will happen if dc supply is given to an ac motor?
the windings will saturate. the dc will act as a brake if motor is already turning if the motor is at a stand still dc will make the motor act like a big magnet until the windings burn out
First of all there are different types of AC motors and so there is no general answer to this question. However if you assume that it is Induction motor,(most widely used type of AC motor), the motor winding gets burnt. Reason being, when a coil is supplied with AC voltage it produces self induced emf (opposing applied voltage) thus limiting the current in the coil. AC motor windings are designed to work with this low currents. If you give same DC volts to the coils due to low resistance and lack of induced emf large currents flow and winding gets burnt. This is true for most of AC motors. But there is one type of motor - DC series motor, that can work on AC voltage also. This is called Universal motor. Home appliances like mixer grinder motors are of this type.
Provided that the level of current is kept within the safe limits for the motor windings you will find that with an induction motor, the shaft becomes very difficult to turn. If the motor was running and the AC supply disconnected and the DC supply connected, it would stop immediately, this is the basis of DC injection braking used widely on radial arm drilling machines.
Smoke Test! Failure, probable. n.b. In the past, back when dinosaurs had D.C. service in their NYC apartments, there were these things called Universal Motors, DC motors that could run on AC as well; I do not miss those suckers, they knocked out all radio reception for dozens of yards whenever they were used.
For an effortless DC (toy) motor with everlasting magnets because of the fact the stator, reversing the outcomes interior the battery ought to opposite the process rotation. employing AC to the motor will opposite polarity (60 cycles in line with 2nd) inflicting the motor to buzz. in particular, extra effective DC autos are extra complicated which includes particularly some shunt windings, etc. To opposite rotation the two the outcomes interior the rotor windings or to the stator windings are reversed (now and returned utilising a reversing swap).yet the two windings are no longer reversed. employing AC to those autos ought to opposite polarity to the two windings which in all probability would not opposite rotation.
