When the inner or outer magnetic circuit ring is fixed, when the thickness increases, the air gap decreases and the effective magnetic flux increases. The obvious manifestation is that the no-load speed decreases and the no-load current decreases under the same residual magnetism. The permanent magnet motor’s Maximum efficiency improvement. However, there are also disadvantages, such as the increase in commutation vibration of the permanent magnet motor and the relative steepening of the efficiency curve of the permanent magnet motor. Therefore, the thickness of the permanent magnet motor magnets should be as consistent as possible to reduce vibration.

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