How can we reduce hysteresis loss in electrical machines?
When the core of the armature exposed to magnetic field, it undergoes one complete rotation of magnetic reversal. Hysteresis losses can be minimized by using material having least hysteresis loop area. Hence silicon steel or high grade steel is used for manufacturing of core.
How can reduce the losses in transformer?
Due to the constantly changing magnetic fields, there is a loss of current in the core. One easy solution for how to reduce eddy current losses in the transformer is to make the core by stacking thin sheets together. This will decrease the eddy current and hence the losses made by it too.
How do transformers reduce eddy current and hysteresis losses?
Methods to reduce the energy loss in transformer:
- Use of low resistance wire for the winding of the coil.
- Heat loss due to eddy current can be reduced by the lamination of the iron core.
- The heat generated can be kept to a minimum by using a magnetic material which has a low hysteresis loss.
What is hysteresis loss in transformers?
Hysteresis loss in a transformer occurs due to magnetization saturation in the core of the transformer. Magnetic materials in the core will eventually become magnetically saturated when they are placed in a strong magnetic field, such as the magnetic field generated by an AC current.
How can transformers reduce dielectric loss?
The transformer oils are subject to change its parameters such as dielectric strength, tan , moisture, chemical parameters (dissolved impurities – dissolution of copper), physical parameters, etc… Periodic testing of the oil and maintaining the insulation quality is an effective way to reduce dielectric loss.
How do transformers reduce eddy current losses?
Since the Eddy current loss is proportional to the square of the thickness of the lamination. ∴ The eddy current loss in a transformer can be reduced by decreasing the thickness of the laminations.
How do transformers reduce iron losses?
Therefore to reduce the iron losses in a transformer, the core should be made of a material having high permeability and high resistivity since high permeability helps in carrying high magnetic flux and high resistivity helps out by preventing eddy currents by providing low conductivity.
How is hysteresis loss used in transformer construction?
…which is known as the hysteresis loss, in reversing the magnetization of the material is proportional to the area of the hysteresis loop. Therefore, cores of transformers are made of materials with narrow hysteresis loops so that little energy will be wasted in the form of heat.