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Most of the magnetizing machines used in loudspeaker production plants need to work continuously. Once damaged, the production will be interrupted. Therefore, it is necessary to magnetize and operate continuously for a long time without damage.

(1) the main reason for the damage of the magnetizer coil is the turn to turn short circuit of the coil:

When the magnetizing machine is used, the coil temperature rises too high, exceeding the maximum allowable operating temperature of the insulating layer of the conductor, and the insulation strength decreases, resulting in an inter turn short circuit after the breakdown of the insulation. Because of the breakdown resistance is greater than the wire resistance, breakdown point will overheat fault of interturn short circuit to expand effective excitation number decreased, magnetizing field decreased.