What are the different methods used for determining BH curve?
What are the different methods used for determining BH curve?
The value of flux density corresponding to this H can be calculated by dividing the flux by the area of the specimen. The above procedure is repeated for various values of H up to the maximum testing point. The B-H curve may be plotted from the measured values of B corresponding to the various values of H.
What is the use of BH curve?
The B-H curve is usually used to describe the magnetization properties of such materials by characterizing the permeability , which is defined as: where and represent the magnetic flux density in tesla (T) and the magnetic field intensity in ampère per meter (A/m), respectively.
What is BH curve in electrical engineering?
The B-H curve (or magnetisation curve) indicates the manner in which the flux density (B) varies with the magnetising force (H). (1) For non-magnetic materials. For non-magnetic materials (e.g. air, copper, rubber, wood etc.), the relation between B and H is given by. figure (a)
Which recorder is used for plotting BH curve for magnetic materials?
Explanation: The fluxmeter is an electronic display instrument used to measure the magnetic flux of permanent magnets hence it can be used to determine B/H characteristics.
How BH curve is drawn in magnetic circuits?
In order to demagnetise the iron bar i.e. to remove the residual magnetism (ob), the magnetising force is reversed by reversing the coil current. When H is gradually increased in the reversed direction, the B-H curve follows the path bc so that when H = oc, the residual magnetism is zero.
Which recorder is used for plotting BH curve?
Why do we use ferromagnetic material in BH curve?
However, soft ferromagnetic materials such as iron or silicon steel have very narrow magnetic hysteresis loops resulting in very small amounts of residual magnetism making them ideal for use in relays, solenoids and transformers as they can be easily magnetised and demagnetised.
What is BH curve for magnetic material?
The B-H curve or magnetisation curve is the graph plotted between magnetic flux density (B) and magnetising force (H). The B-H curve indicates the manner in which the magnetic flux density varies with the change in magnetising force. The following figure shows the general shape of B-H curve of a magnetic material.
What is the unit of reluctance?
The unit for magnetic reluctance is inverse henry, H−1.
How can hysteresis loss be reduced?
How do we Reduce Hysteresis Losses? Hysteresis losses can be reduced by using material that has less area of the hysteresis loop. Hence, high grade or silica steel can be used for designing the core within a transformer because it has extremely less area of the hysteresis loop.
What is XY recorder?
By the term X-Y recorder is meant an instrument that is capable of plotting any two variables against each other, rather than against time. This requires that the recorder be able to plot multiple-valued as well as single-valued curves.