What is the importance of air gap in induction motor?

What is the importance of air gap in induction motor?

The air gap refers to an actual physical gap in an electric motor that separates the moving rotor and the stator core. This gap is a necessary part of motor design and the size of the air gap is one of the keys to motor performance and reliability.

Why the air gap of an induction motor is made as small as possible?

The smaller the air gap is, the lower that reluctance, and thus the higher the magnetic flux (which is the magnetic analog of current), allowing the motor to work more efficiently and at a higher power.

Why is air gap kept low in rotating machine?

Why Air Gap Length is kept Minimum for Induction Machine? The induced EMF in the rotor winding or rotor bars is due to mutual induction caused from the rotating magnetic field produced by the stator winding. Thus, an IM can be treated as a Rotating Transformer as the EMF induced in the rotor is by Mutual Induction.

What will happen if we increase air gap in the induction motor?

If the air gap of an induction motor increases, 1) The permeability of the magnetic circuit rotor-to-stator will decrease. 2) The magnetizing inductance of the motor thus decreases. 3) The magnetizing current will increase; This will cause a poor power factor at all loads.

What happen if air gap in the induction motor?

What is the function of air gap?

One of main reasons for an Air Gap is to increase the reluctance of the magnetic circuit. The amount of air or another non-magnetic material like a fibre plate or fibre board increases the reluctance of the circuit, thereby increasing the amount of current that we could put in a coil before we reach saturation.

What are the advantages of larger air gap length in an induction motor?

What are the advantages and disadvantages of large air gap length in induction motor? Advantage: A large air gap length results in higher overload capacity, better cooling, reduction in noise and reduction in unbalanced magnetic pull.

What will happen if we increase the air gap in the induction motor Mcq?

Why does an inductor have an air gap?

An inductor is driven in current, and the gap linearizes the inductance and allows room for the current AC component, as the article points out extremely well. It can be said that the magnetic energy stored in the inductor resides in the gap.

When does the efficiency of a motor decrease?

A motor ’s efficiency tends to decrease dramatically below about 50% load. However, the range of good efficiency varies with individual motors and tends to extend over a broader range for larger motors, as shown in Figure 1. A motor is considered underloaded when it is in the range where efficiency drops significantly with decreasing load.

What happens when you increase the air gap?

Remember that increasing the air gap further will reduce the flux density generated by the dc current, but won’t reduce the peak-to-peak ac flux change, as this is a function of the applied voltage.

What is the function of air gap in conduction chokes?

In continuous conduction chokes, flyback “transformers,” and single-ended forward transformers, the function of the air gap is different (flyback transformers are really chokes with extra isolated windings).