What is equivalent circuit of synchronous machine?

Thus, the excitation of the synchronous machine is used to control the internally generated voltage. One portion of the equivalent circuit for the synchronous machine is a voltage source that is controlled by the excitation of the field. The remainder of the equivalent circuit is determined by the stator currents.

What is the equivalent circuit of induction motor?

The equivalent circuit of an induction motor is similar to a transformer equivalent circuit because the energy is transferred from stator to rotor is essential as a transformer operation from primary to the secondary winding. An equivalent circuit enables the performance characteristics of the induction motor.

What is the difference between induction and synchronous machine?

The electromagnetic motor which converts electrical energy into mechanical work at variable speed is called as a ‘Induction Motor’. Synchronous motor runs at the synchronous speed. Induction motor runs at the non-synchronous speed. The synchronous motor works on the principle of the ‘Magnetic Locking’.

What is the working principle of synchronous motor?

The principle of operation of a synchronous motor can be understood by considering the stator windings to be connected to a three-phase alternating-current supply. The effect of the stator current is to establish a magnetic field rotating at 120 f/p revolutions per minute for a frequency of f hertz and for p poles.

Which type of induction motor is best for EMF injection method?

10. Which type of Induction motor is best for e.m.f injection method? Explanation: E.M.F injection method is used to control the speed of Induction motor. It is only applicable for WRIM because WRIM rotor consists of copper windings connected in star connection.

What is the main disadvantage of synchronous motors?

Disadvantages or Demerits: Synchronous motors requires dc excitation which must be supplied from external sources. Synchronous motors are inherently not self starting motors and needs some arrangement for its starting and synchronizing. The cost per kW output is generally higher than that of induction motors.

Why can’t an induction motor run at synchronous speed?

The rotor is placed in such a way that this magnetic field induces a current in the rotor. This induced current will flow through the rotor winding causing another flux in the rotor. This flux in the rotor will lag stator flux. So, theoretically, the Induction motor can never run at synchronous speed.

What is the basic principle of synchronous machine?

What are the main parts of synchronous machine?

The stator and rotor are the two main parts of the synchronous motor. The stator is the stationary part, and the rotor is the rotating part of the machine. The three-phase AC supply is given to the stator of the motor.

How is the equivalent circuit of a synchronous machine determined?

One portion of the equivalent circuit for the synchronous machine is a voltage source that is controlled by the excitation of the field. The remainder of the equivalent circuit is determined by the stator currents.

Are there two magnetic fields in an induction machine?

There are still two magnetic fields, one from each of the rotor and stator, but the rotor field is induced by the stator field. Effectively, we can think of the induction machine as a rotating transformer.

Which is better an induction machine or a synchronous machine?

Induction machines, also called ‘ asynchronous machines ‘ are slightly lagging behind the synchronous speed. They operate at a more simplistic principle and they’re also cheaper to manufacture. So, for example, if our turbine turns 50 times per second, the induction machine will generate only 45Hz. We will see why in a bit.

What is the circuit model for an induction machine?

The per-phase equivalent circuit model for an induction machine in steady state operation supplied by a balances three-phase supply is based on the transformer model shown in Fig. 1. We know from the operating principles that induced voltage E R and rotor leakage reactance X R both depend on slip.

What is equivalent circuit of synchronous machine? Thus, the excitation of the synchronous machine is used to control the internally generated voltage. One portion of the equivalent circuit for the synchronous machine is a voltage source that is controlled by the excitation of the field. The remainder of the equivalent circuit is determined by the…