Solution: improved magnetizing machine design, improve the magnetic circuit efficiency of magnetizing machine, reasonable selection of wire coil current density, improve the heat dissipation condition, the magnetizing machine work cycle when meet user needs, not to exceed the maximum working temperature of the coil temperature rise allows wire insulation.

(two) the coil is not fixed. The electromagnetic force acting on the wire is the current through the wire, the flux density at the position of the wire, the length of the wire, the wires that are not fixed, vibrate when they are magnetized, because of the electromagnetic force. The result of vibration will destroy the insulation of the wire, resulting in the turn to turn short of the coil, and decrease the magnetizing field.