Why the no load current of an induction motor is so high as compared to a transformer of identical rating?

To produce a required magnetic field flux density in an Induction motor (which is actually lower than that of a transformer) requires much larger exciting current due to this higher reluctance.

Why is no load current of 3phase induction motor is quite high compared to transformer?

Explain why the no load current of an induction motor is much higher than that of an equivalent transformer. loss, eddy current loss, friction and windage losses. Hence the no load current of induction motor is higher. Starting torque increases with increase in value of rotor resistance.

Why the PF of an induction motor is less than 0.5 on no load?

As the motor is running at no load, the total input power is equal to the constant iron loss, friction, and windage losses of the motor. Since the power factor of the induction motor under no-load condition is generally less than 0.5, thus the Wattmeter reading of one of the Wattmeter will show a negative reading.

Why is the power factor of a 3 phase induction motor low at no toad?

Why is the power factor of a 3-phase induction motor low at no-toad? Because of air-gap, the reluctance of the magnetic circuit of 3-phase induction motor is very high. For this reason, the p.f. of a lightly loaded 3-phase induction motor is very low.

Why no load current is more in induction motor?

As the air gap between the stator field winding and rotor winding is large, the more magnetizing current is needed to create flux which will cut the rotor conductor. So it is an important reason why Induction Motor draws more No Load Current than a transformer.

What is the no load current of induction motor?

The no-load current(Io) is the vector sum of the magnetizing current(Im) and no-load loss components current(Iw). The magnetising current(Im) is drawn by an induction motor to set up the magnetic flux in the air gap. The magnetizing current is responsible for setting up air gap power in induction motor.

What is no load current of induction motor?

The current drawn by the induction motor when it is not coupled to the driven equipment is called no-load current of the motor. The equivalent circuit of an induction motor at no load is as given below. The no-load current produces the magnetic field in the motor. There are two parts of no-load current.

Why no load test is performed in induction motor?

As the name suggest no load test is performed when rotor rotates with synchronous speed and there is no load torque. This test gives the information regarding no-load losses such as core loss, friction loss and windage loss. Rotor copper loss at no load is very less that its value is negligible.

Why does the power factor of an induction motor increases with the load?

The input power factor of the induction increases when the mechanical load increases because in general, the higher the resistance (a load), the higher the power factor. A higher power factor means that there is a tapping of electrical energy in terms of active power.

What is power factor at no load?

When there is no load to consume power, the circuit is almost purely reactive. This means the counter-voltage is at its maximum, the power factor is low, and the current in the primary and secondary are 180° out of phase.

Why no load current is less?

(1) In an Induction motor, the no-load current comprises two parts, one is magnetizing component and another is loss component. So the main point is, more flux production is needed in induction motor than a transformer that is why induction motor draws more No Load current than a transformer.