What is the purpose of the field windings in a generator?

A field winding is the insulated current-carrying coils on a field magnet that produce the magnetic field needed to excite a generator or motor. As each coil is energized in turn, the rotor aligns itself with the magnetic field produced by the energized field winding.

What would happen if you try to start a DC motor without field supply?

The motor will try to speed up to develop a back-emf and with no field it requires a very large armature current. Normally the armature fuses just blow as the current drawn can be very high depending upon the applied armature voltage. In this case the motor will accelerate and run away until the fuses blow.

What will happen if a DC shunt machine is started without field excitation?

Answer: n d.c shunt motor if field winding supply is removed the motor back emf will drop to zero, hence the armature will draw more current to make up the emf. this results in blowing up of fuse.

What is the main purpose of the field windings in a DC motor?

Field Winding of DC Motor The field winding basically form an electromagnet, that produces field flux within which the rotor armature of the DC motor rotates, and results in the effective flux cutting.

What is the role of field winding Mcq?

Explanation: The field winding should be designed for a voltage from 15-20\% less than the exciter voltage. This is because to allow for the drop in voltage between field and exciter and to allow for variations in the reluctance of the magnetic field.

What is generator winding?

A simple generator has two basic parts – field and winding. The field is the magnetic field and the winding is the conductor formed into a coil. The field is connected to a shaft that may be turned. These are two elements. necessary for electromagnetism.

What will happen if the field winding of a running DC motor is opened?

Dc shunt motor consists of armature and field circuit in parallel as shown in fig. As we know, if the field winding of a running shunt motor suddenly breaks open. So, Flux is reduced and speed increase dangerously as flux is inversely proportional to speed.

What happens to the DC motor when it loses its field current?

With field current cut off, a weak field will exist due to residual magnetism. Therefore, motor will overspeed to maintain back emf. However, torque will decrease in the same proportion. So, motor won’t be able to take load and finally come to a standstill, maybe after causing some damage to the motor.

What will happen if field winding of shunt motor got accidently disconnected?

If field winding is disconnected accidentally, the speed would dangerously increase in order to maintain the back emf of the motor.

What will happen if a shunt motor running at no load has its shunt field winding opened accidentally?

Ans: if a shunt motor, running at no load has its shunt field opened or burnt out, the back emf will fall to nearly zero . the armature current will continuously increase the speed of the motor until its parts fly apart.

What is the purpose of a shunt winding?

Main or shunt field windings are used to control the no-load output of a generator. A filter reactor or an inductor is replaced with several turns of series winding on field poles of the rotating generator to provide the inductance that is required for a stable arc.

What happens when a DC motor loses power to its shunt field?

From what I understand the loss of the field current, and thus the field itself, will result in a decrease in back EMF on the armature. This will allow a higher current to flow through the armature, and also cause the motor to speed up.