Vector diagram of synchronous motor

We will discuss here the simplest way of drawing the phasor diagram for synchronous motor and we will also discuss advantages of drawing the phasor diagram. Before we draw phasor diagram , let us write the various notations for each quantity at one place. In order to draw the phasor diagram we will use Vt as reference.

Phasor Ef is always ahead of Vt. These two points are necessary for .

It shows Ea, Vphi, IaXs and the angles theta and delta.

Once the terminal voltage is drawn, additional phasors for current, resistive voltage drop, reactance voltage drop and induced voltage can be added .

The shape of the phasor diagram is dependent on the phase of the current relative to . Vector Diagram of the Synchronous Motor. Synchronous (salient pole) Machine phasor diagram - as PDF File (.pdf), Text File (.txt) or read online for free. The complexity of the vector diagram construction is more pronounced in the leading angle power factor than in the lagging mode. Construction of synchronous machines.

The principles of an AC synchronous machine are illustrated with dynamic vectors. This allows for an understanding of the interaction of various machine parameters. This leads to different diagrams for various DC excitations of the field as shown below. Note also that the over-excited machine (generator or motor ) is capacitive and will supply vars to the infinite bus system.

The opposite is true for the under-excited machine. In the vector diagrams the value of a. The steady-state performance characteristics of the synchronous motor may be studied using the equivalent circuit shown in Fig. Lutfi Al-Sharif The University of Jordan 1961 . This video on synchronous generators shows the phasor diagrams for the voltages in the stator (armature) circui.

The phasor diagram for leading power factor is shown below. Effect-of-load-on- Synchronous - Motor -FIG-1. The load on the shaft is increased. In another wor it can be said that even if the rotor is rotating at synchronous spee . Effect of Excitation on Armature Current and Power Factor The value of excitation for which back e.