The working principle of the magnetizer: the capacitor is first charged with DC high voltage, and then discharged through a coil with minimal resistance. The peak value of discharge pulse current can reach tens of thousands of amperes. This current pulse creates a strong magnetic field within the coil, which permanently magnetizes the hard magnetic material placed in the coil.
The demagnetizer is a little more complicated. The demagnetizer, that is, the demagnetizer, can be divided into pulse demagnetizer and AC demagnetizer. The two most important conditions for demagnetization treatment are:
(a) overlap of magnetic poles (Method: alternating current is used for magnetization; Alternately change the direction of direct current; Change the direction of the specimen in the magnetic field)
(b) the magnetic induction intensity decreases (method: the specimen is gradually separated from the magnetic field or the magnetic field is gradually separated from the specimen; Current attenuation or step-down controlled by the power supply)
The principle of adding magnetic field: the magnetic field N-S pole is in series, and the magnetic field accelerates the magnetization. The reason for the magnetic field of the magnet is that the internal magnetic field is arranged orderly in one direction, and the iron is easily magnetized not because of the magnetic field, but because the internal magnetic field is ordered. Therefore, the root cause of magnetic degaussing is the magnetic field direction.
The head of the screwdriver is generally magnetized, and the screw can be attracted for processing when used, but after a long time, the screwdriver will slowly demagnetize.