MOTOR Russian patent published in 2008 - IPC H02K1/27 H02K21/14 

FIELD: electrical engineering, in particular, motors designed for use in the conditions requiring elimination of noise.

SUBSTANCE: in the motor having a rotor core, in which a great number of permanent magnets is built-in the edge section of the peripheral direction of each permanent magnet or of a nonmagnetic layer, continuing or adjoining the edge section of the peripheral direction of each permanent magnet, passes in the vicinity between the poles to the vicinity of the rotor surface, and the second nonmagnetic layer that is provided in the vicinity of the rotor surface in the lateral position of the pole center relative to the edge section of the peripheral direction of each permanent magnet or nonmagnetic layer, continuing or adjoining the edge section of the peripheral direction of each permanent magnet, and in which the nonmagnetic layer continuing or adjoining the edge section of the peripheral direction of each permanent magnet, and the second nonmagnetic layer are positioned so as, to suppress the harmonics of the n-th order of the induced voltage, where n is the odd number exceeding or equal to 3.

EFFECT: attenuated component of the harmonics of the n-th order oft eh wave shape of distribution of the magnetic flux (wave shape of the induced voltage), for example, of the 5-th or order, which leads to prevention of initiation of unnecessary radial and axial forces, and, consequently, to noise reduction and enhancement of the precision of determination of the motor rotor position at a simultaneous maintenance of the sufficient value of magnetic flux.

14 cl, 21 dwg