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Why does hysteresis loss cause heat and why the heat proportional the area of hysteresis loop?
Hysteresis loss is proportional to the area of the hysteresis loop because it represents the energy that is lost during the process of magnetization and demagnetization of a material. This energy is dissipated in the form of heat, which is directly related to the area of the loop. A larger area means more energy is lost, resulting in a higher hysteresis loss.
The shape of the hysteresis loop directly affects the hysteresis loss. A wider and flatter loop indicates a higher hysteresis loss, while a narrower and taller loop indicates a lower hysteresis loss. This is because a wider loop has a larger area, resulting in more energy being lost during each cycle of magnetization and demagnetization.
No, hysteresis loss varies for different materials. It depends on the composition and properties of the material, such as its magnetic permeability, coercivity, and remanence. Materials with higher magnetic permeability and lower coercivity tend to have lower hysteresis loss, while materials with lower magnetic permeability and higher coercivity tend to have higher hysteresis loss.
Hysteresis loss cannot be completely eliminated, but it can be reduced by using materials with lower coercivity and higher magnetic permeability. Additionally, using laminated cores and applying an alternating current instead of direct current can also help reduce hysteresis loss.
Hysteresis loss is measured by calculating the area of the hysteresis loop on a graph of magnetization vs. magnetic field strength. This can be done using specialized equipment such as a hysteresis loop tracer. The unit of measurement for hysteresis loss is joules per cubic meter (J/m³) or ergs per cubic centimeter (erg/cm³).