I'll answer assuming your fan has been used for a long time.
The armature pulls itself towards the magnets but the razors/bushes keep it in the center.
With time, razors or bushes wear out allowing the armature to move sideways.
If razors/bushes are worn out too much, the armature can come into contact with the field magnet, making rotation almost impossible.
This could be what has happened to your fan.
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