When observing the hysteresis loop of the sample under different frequency signals, what does the observation result indicate? So as to judge how the hysteresis loss changes when used for signal transmission. Under the same excitation, the higher the frequency, the lower the magnetic inductance and the higher the loss!

Hysteresis loss is the energy consumed by hysteresis phenomenon in the process of repeated magnetization of ferromagnet. Hysteresis means that when the magnetic state of ferromagnetic materials changes, the magnetization lags behind the magnetic field strength, and there is a hysteresis loop relationship between its magnetic flux density B and magnetic field strength H.

After one cycle, the hysteresis loss per unit volume of iron core is proportional to the area of hysteresis loop. This part of energy is converted into heat energy, which makes the equipment heat up and reduces efficiency. It is an integral part of the iron loss of electrical equipment, which is not desirable in AC motors and other equipment.

Extended data:

Reasons for hysteresis loss:

Hysteresis refers to the phenomenon that the magnetization of ferromagnetic materials (such as iron) depends not only on the strength of external magnetic field, but also on the original magnetization during magnetization and demagnetization.

When an external magnetic field acts on ferromagnetic materials, the dipoles of its atoms arrange themselves according to the external magnetic field. Even if the external magnetic field is removed, the partial alignment still exists: at this time, the material is magnetized. Once magnetized, its magnetism will remain unchanged.

To demagnetize, just apply a magnetic field in the opposite direction. This is also the memory operation principle of hard disk.

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