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

Advantage: A large air gap length results in higher overload capacity, better cooling, reduction in noise and reduction in unbalanced magnetic pull.

Why length of the air gap is kept small in induction motor?

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 the length of air gap in induction motor is kept minimum possible where as in a DC machine it is larger?

An Induction Motor works on the principle of Electromagnetic Induction. Thus, an IM can be treated as a Rotating Transformer as the EMF induced in the rotor is by Mutual Induction. Longer air gap means increased reluctance and leakage flux. Therefore the value of air gap flux reduces.

Why the air gap between stator and rotor of an induction motor is made very small?

Q5. A 3-phase induction motor is wound for 4 poles and is supplied from 50 Hz supply. Calculate the rotor speed if the slip is 4\%.

What is the length of the air gap?

For small PM synchronous motors, the air gap (mechanical clearance) between the stator core and rotor poles or pole shoes should be 0.3 to 1.0 mm [6,8], and can even reach 1.5 mm [9]. The smaller the air gap, the lower the starting current drawn by the motor.

Why do we use damper winding?

Damper windings helps the synchronous motor to start on its own (self starting machine) by providing starting torque. By providing damper windings in the rotor of synchronous motor “Hunting of machine”can be suppressed.

How the air gap of an alternator is measured?

How much air gap is there in the alternator? The measurement is around 1 to 1.5mm. It can be checked by placing a plastic feeler gauge between the two parts. It should be the same all the time.

What happens if the air gap becomes more or less?

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.

How much air gap length should be in alternator?

It can be checked by inserting a plastic feeler gauge between the stator and rotor. It should be uniform all round. Originally Answered: how much air gap length in alternator? It should be as small as possible to reduce the eddy current losses due to leakage flux and large gap will increase the windage losses.

What happens if the air gap of an induction motor is increased?

If the air gap of an induction motor is increased, the following will happen: The permeability of the magnetic circuit rotor-to-stator will decrease. The magnetizing inductance of he motor thus decreases. The magnetizing current will increase. This will cause a poorer power factor at all loads.

Why do we use alternator instead of induction generator?

As the load on the generator increases it is seen that magnitude of negative slip also slowly increases thereby reducing the efficiency of the machine so it is advice able to use alternator (synchronous machine ) instead of induction generator . Induction generator is also an asynchronous machine..

Why is the air gap kept high in synchronous machines?

In Synchronous Machines, air gap is kept higher than Induction Machines to improve stability of the machine. The armature reaction or armature flux will reduce as the air gap increases due to increase in reluctance. If armature flux reduces, the hypothetical armature reaction reactance also reduces.

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