How does synchronous motor behave at no load?

A synchronous motor running with no load will lead the current i.e. leading power factor like a capacitor. This synchronous motor running without load i.e. over-excited is synchronous condenser.

Can the synchronous condenser be operated at zero PF?

A synchronous condensor operates at nearly zero real power. As the machine passes from underexcited to overexcited, its stator current passes through a minimum.

What is the power factor of a synchronous motor at no load?

unity power factor
If the field current is increased, the pf will become. leading and the current will increase.

What is the purpose of a synchronous condenser?

A synchronous condenser is a conventional solution that has been used for decades for regulating reactive power before there were any power electronics compensation systems. A conventional synchronous condenser is an AC synchronous motor that is not attached to any driven equipment.

Why synchronous motors are not self starting?

Above a certain size, synchronous motors are not self-starting motors. This property is due to the inertia of the rotor; it cannot instantly follow the rotation of the magnetic field of the stator.

Can an induction motor run at synchronous speed?

The Induction Motor cannot run at Synchronous speed because the Slip is never zero in an Induction Motor.

Why a synchronous motor inherently has no starting torque?

Above a certain size, synchronous motors are not self-starting motors. This property is due to the inertia of the rotor; it cannot instantly follow the rotation of the magnetic field of the stator. Because of this action, the rotor will be subjected to an instantaneous torque in an anticlockwise direction.

Why synchronous machine is synchronous condenser?

When the motor is operated at no load with over-excitation, it takes a current that leads the voltage by nearly 90 degrees. Thus, it behaves like a capacitor and under such operating conditions, the synchronous motor is called a synchronous capacitor.

When the motor runs on no load condition what happens to the back emf?

On the other hand, if there is no mechanical load on the motor, it increases its angular velocity until the back emf is nearly equal to the driving emf. Then the motor uses only enough energy to overcome friction. I=V/R=(8.0V)/(0.400Ω)=20A.