Stator for an electric machine

  • US 8,922,078 B2
  • Filed: 07/07/2011
  • Issued: 12/30/2014
  • Est. Priority Date: 07/07/2011
  • Status: Active Grant
First Claim
Patent Images

1. Stator for an electric machine which comprises:

  • a stator core having a first and a second face opposite to each other and a circular array of stator slots extended between said faces and distributed around a stator axis; and

    a bar winding comprising a plurality of basic conductors and a plurality of special conductors which are interconnected to form the bar winding;

    wherein the basic conductors each comprise two basic conductor legs and a basic conductor connecting portion between said legs, each leg of basic conductor having an end portion connected to the basic conductor connecting portion and an opposite free end portion;

    wherein the basic conductors are inserted into the stator slots with free end portions projecting from said second face, the free end portions defining a plurality of circular conductor layers concentric to one another comprising a circular layer of radially outer ends and a circular layer of radially inner ends, andwherein the special conductors include a jumper of a first type having a first and a second leg of jumpers connected respectively to two of said free end portions and one jumper connection portion between said legs of jumpers, the jumper connection portion being extended radially outward with respect to said radially outer end layer, or radially inward with respect to said radially inner end layer, to pass around at least one of the free end portions respectively of the radially outer end layer or the radially inner end layer, and,wherein the jumper of said first type is arranged in such a way that;

    the two free end portions to which the first and the second jumper leg are connected belong respectively to two of said conductor layers, each distinct;

    at least one of the first and second legs of jumpers extends in a respective passage defined in said conductor layers to connect to the respective free end portion; and

    wherein said conductor layers include a first set of free end portions bent circumferentially at a first pitch and a second set of free end portions bent circumferentially at a second pitch, different from the first pitch, and wherein at least one of said conductor layers comprises a group of free end portions bent at said first pitch which are arranged in succession and circumferentially adjacent to one another;

    the jumper of said first type going around said group of free end portions, and said free end portions to which the first and the second leg of jumpers are connected, being bent at said second pitch.

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