hysteresis loss

Energy loss of ferromagnetic materials caused by hysteresis during magnetization. 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 equal to the area of hysteresis loop. This part of energy is converted into heat energy, which makes the equipment heat up and reduces the efficiency, which is not desirable in AC motors and other equipment. The hysteresis loop of soft magnetic materials is narrow and the hysteresis loss is relatively small. Silicon steel sheets are widely used in motors, transformers, relays and other equipment.