What is the significance of V and inverted V curves of synchronous motor?

This is called an inverted V curve of the synchronous motor. From the inverted V – curve, The synchronous motor operates at a lagging power factor when the excitation is under excited. The motor operates at a unity power factor at normal excitation.

What is the V-curve of synchronous motor show relationship between?

Detailed Solution. Synchronous motor: V curves for synchronous motor give the relation between armature current and DC field current.

Why does the V-curve shift upwards?

– Each V-curve is plotted for a particular load on shaft. – If load is increased, the plot shifts upwards, as the armature current increases, to supply more active power.

What is the application of synchronous motor?

Synchronous motors are normally used in applications in which a constant and precise speed is required. Typical applications of these low power motors are positioning machines. They are also used in robot actuators. Synchronous motors are also used in ball mills, watches, record players, and turntables.

What happens to the synchronous motor when the excitation of an unloaded salient pole synchronous motor suddenly gets disconnected?

When the excitation of an unloaded salient pole synchronous motor suddenly gets disconnected the motor run as a variable reluctance motor. Reluctance torque is the torque generated because the motor is moving to a position where the reluctance seen by the armature flux is declining.

When excitation is increased over excitation the synchronous generator operates at?

In synchronous generator, inverted V curve is drawn between field current on X-axis and power factor on Y-axis. At critical excitation the power factor is unity. If excitation is decreased, the generator operates at leading power factor and if excitation is increased, the generator operates at lagging power factor.

What is the significance of V characteristics of synchronous motor?

The V curves are useful in adjusting the field current. Increasing the field current, If beyond the level for minimum armature current results in leading power factor. Similarly decreasing the field current below the minimum armature current results in a lagging power factor.

When excitation is increased the synchronous generator operates at?

What is an inverted V curve?

The Inverted V Curve is a graph showing the relation of power factor as a function of field current.

What is the advantage of synchronous motor?

The advantages of the synchronous motor are the ease with which the power factor can be controlled and the constant rotational speed of the machine, irrespective of the applied load. Synchronous motors, however, are generally more expensive and a d.c. supply is a necessary feature of the rotor excitation.

Why synchronous motor produces torque at synchronous speed?

In the synchronous AC motor, the speed of rotation is synchronized to the frequency of the AC input current. The torque of a synchronous motor is produced by the phase difference between the rotating magnetic field and the rotor.

When V is applied voltage then the breakdown torque of synchronous motor varies as?

Therefore torque T ∝ P As power varies as applied voltage V, torque of synchronous motor is also varies as applied voltage V.