Cage rotor and bar comprising a notch

  • US 10,033,254 B2
  • Filed: 10/17/2013
  • Issued: 07/24/2018
  • Est. Priority Date: 10/30/2012
  • Status: Active Grant
First Claim
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1. A cage rotor for an electrical machine, comprising:

  • a rotor laminated core having a groove;

    a short-circuiting ring having a first material and cast onto an axial end of the rotor laminated core; and

    a bar constructed from conductor elements having a circular or rectangular cross-section and having a diameter up to 1 millimeter, said bar being arranged in the groove and having a bar end, said bar end penetrating into the first material and having a plurality of notches, said plurality of notches having a penetration depth of at least 60 percent of a height of the bar, wherein the bar has a connection facility on each of the notches in the form of a bracket surrounding the bar or a material configured to at least partly fill up the plurality of notches, to hold the bar when inserted during manufacturing of the cage rotor or the electrical machine, wherein the bar has an outer surface provided with at least one notch, said at least one notch extending in a shape of a wedge from the outer surface into the bar to a notch depth.

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