FLAT ELECTRIC MOTOR

摘要

The electric motor comprises a rotor (14) with a flat, permanent magnetic disc (15) which is rotatable about an axis of rotation (10), and an electromagnetic stator (16) with a stack of flat, electrically insulating supporting elements (38) having a first and second principal surfaces on which patterns of conductor tracks (44) are provided in such a manner that there is formed a number of windings consisting of first (46) and second coils (48) which are arranged in a ring about the axis of rotation and which are formed by spirally extending conductor tracks on the first and the second principal surface of each supporting element. The coils (46, 48) which form part of one winding are electrically connected in series via connection tracks (52) which form part of the conductor tracks (44), interconnections (50, 56) which extend between the first and second principal surfaces, and connection elements which connect connection tracks on different supporting elements of the stack to one another. The supporting elements (38) of each stack are formed by successive parts of a support (34) in the form of a strip of an electrically insulating foil, between each pair of successive supporting elements there being provided a folding line (36) which extends transversely of the local longitudinal direction of the strip. In order to form the stack of supporting elements (38), the strip is folded along the folding lines (36) and the connection elements are formed by connection tracks (52a) which cross the folding lines. Very reliable connection elements (52a) are thus formed at hardly any additional cost.