DC ELECTRIC MACHINE Russian patent published in 2011 - IPC H02K31/02 H02K31/00 

FIELD: electricity.

SUBSTANCE: invention relates to the field of electric engineering, in particular, to electromechanical conversion of electric energy, and may be used in electric engineering and electric machine building industry and on transport as electric drive with low-voltage supply. Technical result of the present invention is increased efficiency of DC electric machine by reduction of electric and magnetic losses, simplified current pickup and reduction of cost. Specified technical result is achieved by the fact that in DC electric machine - unipolar with excitation coaxial coil arranged on stator, with cylindrical hollow or disk anchor made of soft magnetic material, according to invention, to remove current from anchor, double-sided hard ring brushes are used from antifriction material of high conductivity, contacting with both side surfaces of peripheral part of anchor, and excitation coil is arranged of wire of ferromagnetic material. Availability of solid ring brushes in the device from antifriction material of high conductivity simplifies brush device, reduces cost of electric machine and makes it possible to eliminate formation of current cords in machine anchor, developing longitudinal components of anchor magnetomotive force and pulsation of magnetic flow, deteriorating conditions of machine operation and reducing its efficiency, and also makes it possible to increase current in machines with disk anchor, to eliminate deformations of anchor and to reduce diamagnetic gap and to eliminate axial loads at machine shaft.

EFFECT: using ferromagnetic material for excitation winding and anchor reduces cost of electric machine, reduces magnetic flow of excitation winding scattering and magnetic resistance in gap between poles of machine.

2 dwg