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Electrically motorized wheel assembly

  • US 5,438,228 A
  • Filed: 11/12/1993
  • Issued: 08/01/1995
  • Est. Priority Date: 07/14/1992
  • Status: Expired due to Fees
First Claim
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1. An electrically motorized wheel assembly comprising:

  • a hollow shaft having a first opening at one end thereof and a second opening, said first opening receiving conductors from outside of said assembly;

    a stator coaxial with and fixedly attached to said shaft, said stator being provided with coils, said stator comprising a central portion attached to said shaft, a support provided with openings and extending radially from said central portion, and a peripheral circular pole piece wound with said coils, said pole piece being fixed onto peripheral ends of said support;

    a rotor coaxial with said stator and mounted for rotation about said stator, said rotor comprising a housing having a cylindrical wall having an inner surface provided with a magnetic means surrounding said stator and separated therefrom by an air-gap, said housing comprising an inner wall, on a side of said cylindrical wall, and an outer wall, on the other side of said cylindrical wall, said shaft extending through said inner wall and centrally thereof, said outer wall of said housing comprising convex and concave sections that alternate along circumference direction thereof, in such a manner that, when said rotor is rotating, an air circulation is produced inside said housing by means of said convex sections, and an air circulation is produced along outside portions of said concave sections, whereby an efficient heat exchange can be obtained through said outer wall; and

    converting means for converting an input electrical current to a variable AC electrical current, said converting means including power electronics, input terminals for receiving said input electrical current and output terminals for delivering said variable AC electrical current to said coils of said stator.

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