Electrical Engineering ⇒ Topic : Importance of Hysteresis Loop
Importance of Hysteresis Loop
The shape and size of the hysteresis loop *largely depends upon the nature of the material. The choice of a magnetic material for a particular application often depends upon the shape and size of the hysteresis loop. A few cases are discussed below by way of illustration.
(1)The smaller the hysteresis loop area of a magnetic material, the less is the hysteresis loss.The hysteresis loop for silicon steel has a very small area [See Fig. a (i)]. For this reason,silicon steel is widely used for making transformer cores and rotating machines which are subjected to rapid reversals of magnetication.
(2)The hysteresis loop for hard steel [See Fig. a (ii)] indicates that this material has high retentivity and coercivity. Therefore, hard steel is quite suitable for making permanent magnets. But due to the large area of the loop, there is greater hysteresis loss. For this reason, hard steel is not suitable for the construction of electrical machines.
(3) The hysteresis loop for wrought iron [See Fig. a (iii)] shows that this material has fairly good residual magnetism and coercivity. Hence, it is suitable for making cores of electromagnets
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