What is no load excitation current?

The no-load current of a transformer is the vector sum of the exciting current and core loss current of the transformer.

What is excitation current in induction motor?

Excitation current needed for the generator is provided by the excitation system. The excitation power source can be from the exciter, which is either a separate DC or AC generator. The exciter has its field winding (DC current) in the stator and armature winding in the rotor.

What is excitation current?

1 : a current that excites or energizes an electrical apparatus (such as the field magnets of a dynamo) 2 : the current taken by the primary of a transformer on no load.

What is under excitation and over excitation?

The over-excitation limiter protects the generator against over-temperature caused by high field current for long time. Under-excitation limiter prevents the decrease of generator field current to the values lower than the stability margin or the thermal limit of end side of the stator core.

What is full load current and no load current?

Full load current is that which is drawn while the load is operating at full capacity. And no-load current that which is drawn then the load is removed and only the control circuits are drawing current. An HCAC system is a good example. When neither heating or cooling is required the controls draw no-load current.

What is the difference between synchronous AC and induction motors?

In contrast, consider a synchronous motor. Here, the rotor turns at the same rate — that is, in synchronization — as the stator’s magnetic field. Like the induction motor, the synchronous ac motor also contains a stator and a rotor.

How does a non-excited synchronous motor work?

Non-excited synchronous motors have steel rotors. In operation, the rotor is magnetized with the required magnetic poles in a manner analogous to that of an induction motor. But the rotor turns at the same speed and in synch with the stator rotating magnetic field. The reason is there are slots in the rotor.

Is the no load current equal to the excitation current?

The no load current is not equal to the excitation current. The no load current (Io) is equal to the vector sum of the excitation current (Im) and the working current (Iw).

What is an an induction motor?

An Induction Motor is also known as Asynchronous Motor. It is so called because it never runs at synchronous speed. i.e., Ns = 120f/P. The induction motor is most widely used motor in all domestic and commercial motor.