What is leakage reactance of induction motor?

Abstract: The leakage reactance of an induction motor that determines the locked-rotor current at full voltage is generally much smaller than the reactance that determines the full-load power factor or the pullout torque.

What is leakage reactance?

Leakage Reactance Transformers provide both transformation and relatively high reactance between the source and the load. They are defined as those providing an artificial leakage flux path between the primary and secondary windings.

What causes leakage reactance?

Leakage Flux in Transformer This flux is called leakage flux which will pass through the winding insulation and transformer insulating oil instead of passing through core. Due to this leakage flux in transformer, both primary and secondary windings have leakage reactance.

What is Armature leakage?

INTRODUCTION. HE ARMATURE leakage may be defined as the reactance due to the difference between the total flux produced by an armature current and the flux in the airgap produced by the same armature current. There are a number of components of stator leakage.

How do you find the leakage reactance?

X1 and X2 = leakage reactance of primary and secondary winding resp. Z1 and Z2 = Primary impedance and secondary impedance resp. Z1 = R1 + jX1 …and Z2 = R2 + jX 2 .

What is the leakage resistance?

[′lēk·ij ri¦zis·təns] (electricity) The resistance of the path over which leakage current flows; it is normally high.

How can leakage reactance be reduced?

Controlling the leakage reactance in power transformer

1. Keeping the spaces between the windings small.
2. Placing the windings as close together as possible.
3. Varying the winding dimensions.

What is armature leakage flux?

Armature Leakage Reactance In an AC electrical machine, the magnetic flux set up by the load current which does not contribute to the useful magnetic flux of the machine is known as leakage flux. This leakage flux sets up a self-induced EMF in the armature winding of the machine.

How do you calculate leakage factor?

Leakage factor in magnetic circuit is defined as:

1. total flux + useful flux.
2. total flux × useful flux.
3. useful flux / total flux.
4. total flux / useful flux.

What is high leakage resistance?

How do you calculate leakage resistance?

3. You need to use the formula; R = rho E/C (it’s the lesson books somewhere!), where E = ErEo. Therefore R = 1014 * 1.062*10^-10/100*10^-12.

How do induction motors reduce leakage flux?

If the air gap of an induction motor is increased, The permeability of the magnetic circuit will decrease. The magnetizing inductance of the motor will decrease. Leakage reactance will increase.