What would happen to the DC series wound motor if it is operated at no load?

With no mechanical load on the series motor, the current is low, the counter-EMF produced by the field winding is weak, and so the armature must turn faster to produce sufficient counter-EMF to balance the supply voltage. The motor can be damaged by overspeed. This is called a runaway condition.

What happens if the field winding of the synchronous motor is short circuited?

In the case of an induction motor, the field winding is permanently short-circuited by end rings. In a Synchronous motor, the rotor winding is supplied with DC excitation. Therefore if we short circuit the field winding of a synchronous motor then it will behave as an induction motor.

What will happen if the direction of current at the terminals of a DC motor is reversed?

When both (the direction of the field as well as that of armature current) are reversed the direction of rotation will not change. So in the case of DC shunt motor, if the supply terminals are interchanged, there is no change in the direction of rotation.

What happens if you cut off the field winding of DC motor?

As for shunt motor, speed is inversely proportional to field current, so cutting off the field winding results in dangerously high speed. Thus motor gets damaged. However for series dc motor, cutting off the field winding simply decreases the speed of the motor and the motor stops. Hope this helps:)

What is a field winding opening in a series motor?

In case of a series machine field winding opening means that the motor circuit is open and no current will pass through armature , for operation of machine interaction of two fluxes is necessary thus the machine won’t operate. How this 19-year-old earns an extra $3600 per week.

Why does a DC motor stop working when there is no supply?

When supply is cutoff to the field winding.The DC motor stops running because the torque developed by DC motor is because of interaction of field flux and armature flux.so when there is no supply to field winding,field flux can’t generate and can’t develop torque.Hence it stops working

What happens if you cut off the supply for field winding?

In a DC series motor, if you cut off the supply for the field winding it means you have cut the supply off the motor as the field is in series with the armature. So it will simply come to rest after sometime.