ELECTRIC MACHINE Russian patent published in 2025 - IPC H02K1/16 H02K1/27 H02K21/14 H02K5/00 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering, in particular to electric machines with permanent magnets on a rotor, and can be used in electric drives and generator plants. Electrical machine comprises a magnetic section of a housing made of solid ferromagnetic material with a laminated stator package installed in it, with p pole winding (p=2, 4, 6, 8 … – an even number) installed in the slots of the stator package. Besides, it comprises magnetically conducting rotor part with toothed section having p/2 teeth arranged opposite the stator stack and cylindrical section. One or two ring coils of excitation winding are fixed on stator in one or two cavities formed by packages of stator and rotor and magnetic section of housing. Permanent magnets are installed in the slots of the toothed section of the rotor, which form only the south or only north poles coming out into the gap. Magnetic section of the stator housing forms a gap with the cylindrical section of the magnetically conductive part of the rotor. Coercive force of magnets is not less than 3 kOe. Surface of the magnet has a section adjoining the bottom of the groove of the rotor package. Permanent magnet has an outer section, which widens towards the bottom of the rotor slot, the radial size of which is not less than 1/4 of the radial size of the magnet, and the angles formed by the tangential planes to the opposite side surfaces are not less than 20°. Distance from the magnet surface facing the stator to the inner surface of the stator package is not more than a tenth of the radial size of the magnet.

EFFECT: increased reliability of the electric machine by reducing the demagnetizing force acting on the magnets, preventing the demagnetisation of the magnets, increase in current load, increase in efficiency and specific power without increase in frequency of supply voltage and power of inverter, reduced weight of magnets, as well as increased maximum permissible speed of rotor rotation, reduced pulsations of moment and distortion of electromotive force.

6 cl, 5 dwg