Patent ID: 6246146
Filing Date: 2001-06-12
Classification: H02K

Abstract:
An electric direct current machine comprising:a housing comprising two parallel end walls;a rotor, comprising a shaft, rotatably mounted in said housing perpendicular to said end walls;a plurality of electromagnets mounted between said end walls at a predetermined distance from the axis of rotation of said rotor, each of said electromagnets comprising one or more electrical conductors forming a coil winding on a coil core, each electrical conductor comprising at least one connect surface;a plurality of permanent magnets, comprising opposite pole faces, disposed at regular angular distances on said end walls, said pole faces being opposite end faces of said coil core, with each consecutive permanent magnet in the circumferential direction having opposite polarities; anda plurality of contact elements assigned to said permanent magnets, each comprising at least one sliding contact having a contact surface;wherein the ends of the electrical conductors forming the coils of said electromagnets are taken radially inward and connected in an electrically conductive manner with said assigned contact elements, thus forming a commutator, by pressing the sliding contacts of said contact elements onto the connect surfaces of said electrical conductors, said contact elements being held in the housing;wherein said contact elements on one side of said electromagnets, forming the commutator, being for connecting to a source of direct current or to a direct current consumer, and said contact elements on the opposite side of said electromagnets being connected to one another in pairs;wherein each of said electromagnets is held in a hub support, which is connected with the shaft of the rotor so as to insure mutual rotation;wherein each pole face of the permanent magnets overlaps several opposite coil cores; andwherein the contact surfaces of the sliding contacts of the commutator assigned to one of said permanent magnets overlap about half of the contact surfaces of the sliding contacts of the corresponding contact elements assigned to a pole face of a corresponding permanent magnet on the opposite side of the electromagnets, said overlapping opposite contact surfaces being offset to one another.