What is the stray load losses?

The stray load loss can be regarded as the difference of the total iron losses and harmonic rotor cage losses between the no load and load conditions. Firstly, the amplitudes and rotation speeds of the main space harmonics of the airgap magnetic flux density are calculated based on the GAFMT.

What do you mean by stray load loss of an alternator?

Stray load losses – These are losses caused by the load current due to changes in the magnetic flux distribution, eddy currents and harmonics. They can be reduced by using better materials and thinner laminations.

What are stray load losses in DC machine?

According to this standard, the stray load losses 1n d.c. machinery are defined as the sum of the following par- tial losses: (1) Additional core loss due to the flux from arma- ture windings excited by load current (2) Eddy currents in the armature windings (3) Short circuit loss of commutation.

What losses are sometimes called stray losses?

Stray losses are also called iron losses. Refer the photo of core assembly figure 6. Leakage field present in the transformer induce eddy currents in conductors, tanks, channels, bolts etc and these eddy currents give rise to stray losses.

Which losses are called stray losses?

What is windage loss?

Windage loss is the reduction in efficiency due to windage forces. For example, electric motors are affected by friction between the rotor and air. Large alternators have significant losses due to windage. There are two causes of windage: The object is moving and being slowed by resistance from the air.

What are stray losses in transformers?

The stray losses in transformer metallic parts are caused by magnetic leakage flux generated basically by the current passing through the windings but also by the high-current loops outside the windings.

What is mechanical loss?

As their name suggests, mechanical losses are caused by movement of the motor. These include the friction in the motor bearings, friction between the brushes and the commutator, and drag on the rotor caused by turbulence of the air around it (sometimes referred to as windage loss).