Through the femtosecond detection, it was found that many electromagnets were found to have serious heating and magnetic force decline during use. The main reasons are as follows:
one
The relation between resistance, voltage and current is U=RI. When the voltage is constant, the smaller the resistance, the greater the current. The higher the current passing through the unit section, the higher the heat of the enamelled wire. The hotter the coil, the higher the resistance and the smaller the current that passes through it. As a result, the attraction of the electromagnet decreases. It will recover when it cools down.
2. Material problem. Usually referred to as enamelled wire refers to copper enamelled wire. Which means the conductor is copper. But copper is divided into new copper and recycled copper. The recovered copper has more impurities, and its electrical conductivity is worse than that of new copper. The heat under the same conditions is also large. There is also a copper-clad aluminum wire, which is worse in tensile and fatigue than copper wire. Impurities and the conductivity of aluminum lead to serious heating.
3, electromagnet mechanism design problems
(1) Charging state, in the charging state, the battery will generate heat, which is a normal phenomenon. It is used when charging for a long time, and the second is the reason for the charger and data cable
(2) Playing large mobile games or applications will take up a lot of CPU resources.
(3) When using the mobile phone under charging state, it is recommended to use it after full charge.
(4) The use of mobile phones in a closed environment, because the mobile phone is in a closed state, the heat does not go out, will lead to serious fever, it is recommended to use in a better ventilated environment.
(5) Using mobile phones for a long time, such as talking for a long time, playing games, etc.
A little heat during charging is normal about charging heat: The charger is equivalent to a small transformer, which converts 220V electricity into the voltage acceptable to your mobile phone. When the primary winding of the transformer is energized, the magnetic flux generated by the coil flows in the core, because the core itself is also a conductor, the potential will be induced on the plane perpendicular to the magnetic force line, and the potential will form a closed loop on the cross section of the core and generate current. It seems that a vortex is called a vortex.
This \"eddy current\" increases the loss of the transformer and increases the temperature rise of the transformer's core heating transformer.