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External magnetic field direction and Curie temperature of permanent magnet motor
Aug 17, 2018

The permanent magnet motor magnetic tile is below the Curie temperature. During the operation, there are many small areas inside the ferromagnetic or ferrimagnetic material which each have a spontaneous magnetic moment and the magnetic moments are paired. The orientation of the magnetic motor of the permanent magnet motor is disordered. If the magnetization is not applied with a magnetic field, the magnetic moment is zero as a whole.

The permanent magnet motor magnetic tile has a strong "exchange coupling" between adjacent electrons. In the absence of an external magnetic field, their spin magnetic moments can "spontaneously" in a small area. A small area that is neatly arranged to form a spontaneous magnetization is called a magnetic tile.

In the unmagnetized ferromagnetic material of the permanent magnet motor, although there is a certain spontaneous magnetization direction inside each magnetic tile, there is a great magnetic force, but the magnetization directions of a large number of magnetic tiles are different, so the whole ferromagnetic mass Not magnetic.

When the ferromagnetic material is in an external magnetic field, the volume of the magnetic tile whose spontaneous magnetization direction and the direction of the external magnetic field are at a small angle expands as the applied magnetic field increases and the magnetization direction of the magnetic tile further turns toward the direction of the external magnetic field.

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