TECHSHORE INSPECTION SERVICES : MPT Hysteresis curve

The above figure demonstrates the relationship between flux density-B and magnetization force-H of a ferromagnetic material. initially the material is in its normal state which means its not being magnetized hence B=0 and H=0.we plot the relation between B and H in such a way that X- axis represents the magnetization force(H) and Y-axis represents flux density (B).

So here we study what happens to the flux density in the material if the magnetization force is increased and also decreased. so in the beginning we increase magnetization force to a positive value and hence we can see there is a steep increase in the flux density and further when H is increased the increment in flux density becomes gradually slow that it reaches a saturated state which shows there is no further increment in B(flux density) after a particular level of H is increased. hence the curve Oa represents the saturation level.
now if the magnetization force is reduce flux density is also reduced but when the magnetization force is reduced and reach to 0 level, flux density doesn’t reach to ‘0’ level instead it attains a positive value due to the residual magnetism effect in the ferromagnetic material. hence Ob represents residual magnetism.

Now in order to bring down the flux density in the material to ‘0’ level, magnetization force is reduced. hence ‘Oc’ represents the force required to bring down the attained flux density when the magnetization force is ‘0’ which is called as coercive force. now further if the magnetization force is reduced flux density also reduced but after a further level of decrement in magnetization force flux density won’t reduce any more which means it has reached the saturation state hence ‘Od’ represents saturation level in negative direction.

As we get know any further decrement in magnetization force won’t bring any decrement in flux density we  increase the magnetization force from the negative direction, the flux density increases, and when H becomes ‘0’,then the flux density also should come to ‘0’ level, but instead of ‘0’ value the flux density attains a negative level when the magnetization force is 0.hence ‘Oe’ represents residual magnetism in negative state. further when magnetization force is increased flux density increases and becomes 0.hence ‘Of’ represents coercive force in positive direction further increment in magnetization force increases the flux density hence completes the curve reaching the saturation level. hence the whole curve can be called as hysteresis curve or B-H curve.

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