| 摘要 |
2075801 9211682 PCTABS00014 An electronically switched d.c. machine, in particular a d.c. motor, has a permanent magnet rotor with a substantially cylindrical annular gap (35) having a homogeneous magnetic field with rectilinear, radially extending lines of electric flux and a constantly variable polarity. A sinuous stator arrangement has rectilinear sections (44, 48) that extend back and forth within the annular gap (35). Each rectilinear section (44, 48) of the sinuous arrangement is composed of a plurality of geometrically parallel, mutually spaced conductive sections (44', 44", 44'", 44""; 48', 48", 48'", 48"") having a substantially rectangular cross section. In order to reduce as much as possible eddy current losses even with a considerable current conduction, each conductive section (44', 44", 44'", 44""; 48', 48", 48'", 48"") is arranged within the annular gap (35) in such a way that the longer side of the conductive cross section extends parallel to the orientation of the lines of electric flux (37). In addition, a fan that is independently driven from a second driving stage can be arranged within the motor housing. The fan generates a stream of cooling air that can be introduced into the magnetically active annular gap (35) to cool therein the conductive sections (44', 44", 44'", 44""; 48', 48", 48'", 48"").
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