ELECTRICAL MACHINE ROTOR MAGNETIC SYSTEM Russian patent published in 2018 - IPC H02K1/27 H02K21/14 

FIELD: electricity.

SUBSTANCE: rotor comprises a shaft, a magnetic core made of two concentric shafts of soft magnetic material pieces having no discontinuities in the outer and inner diameters, one of which is rigidly fixed to the shaft, and the second, external, is separated from it by a symmetrical wave-like opening with equal distances between the peaks of the wave crests located near the boring of the rotor and spaced at the same distance from it. In this hole, there are permanent magnets having the same magnetic polarity between each pair of adjacent maxima. This polarity changes to opposite at each passing of a top. The rotor is equipped with bridges connecting the outer and inner parts of the magnetic circuit in the region of the lower wave maxima. The undulating aperture is made by divided bridges into 2p parts, where p is the number of pairs of poles of the electrical machine.

EFFECT: increase of rotor speed and reduction of additional losses in it.

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