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swayam007
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Why is it that the air gap flux density is flat topped at no load. What happens to it's shape when machine is loaded?
Air gap flux density in a DC machine refers to the amount of magnetic flux per unit area that exists in the air gap between the stator and rotor of the machine. It is a measure of the strength of the magnetic field in the air gap.
Air gap flux density plays a crucial role in the functioning of a DC machine. It determines the torque and speed of the machine, as well as the amount of electrical power that can be transferred from the stator to the rotor. It also affects the efficiency and performance of the machine.
Air gap flux density can be calculated by dividing the total magnetic flux that passes through the air gap by the cross-sectional area of the gap. It can also be calculated using the equation B = μ0μrH, where B is the flux density, μ0 is the permeability of free space, μr is the relative permeability of the material in the gap, and H is the magnetic field strength.
The air gap flux density in a DC machine can be influenced by various factors such as the number of turns in the stator winding, the strength of the permanent magnets in the rotor, the speed of the machine, and the size and shape of the air gap. The material used for the stator and rotor also plays a role in determining the air gap flux density.
Air gap flux density can be controlled in a DC machine by altering the design and materials used for the stator and rotor, as well as by adjusting the number of turns in the stator winding. The use of permanent magnets in the rotor can also help to regulate the air gap flux density. Additionally, the speed of the machine can be adjusted to control the flux density.