COMMUTATOR ELECTRIC MACHINE Russian patent published in 1994 - IPC

FIELD: electric machine engineering. SUBSTANCE: brush unit positioned on support includes brush and two pressure springs, one being pressed against the other one at point of brush attachment. One of pressure springs is manufactured in the form of level which free end carries permanent magnet placed at distance equal to product of initial height of brush by relation of arms of lever from inner surface of steel body of machine. Current lead proper is axis of rotation of lever. Free end of the other pressure spring is anchored in current lead. There is envisaged possibility of making pressure spring on which brush is anchored in the form of hyperbolic spiral and placement of plate produced from magnetically soft material on support. EFFECT: improved stabilization of pressure on brushes during long-term operation. 3 cl, 1 dwg