Cage rotor and bar comprising a notch
First Claim
Patent Images
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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Abstract
A cage rotor for an electrical machine includes a rotor laminated core having a groove, and a short-circuiting ring having a first material and cast onto an axial end of the rotor laminated core. Arranged in the groove is a bar which has a bar end. The bar end penetrates into the first material of the short-circuiting ring and has a plurality of notches to provide the bar end with a greater flexibility.
8 Citations
12 Claims
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1. A cage rotor for an electrical machine, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An electrical machine, comprising a cage rotor including 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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12. A method for manufacturing a cage rotor, comprising:
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casting a short-circuiting ring onto an axial end of a rotor laminated core having a groove; arranging 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 in the groove such that a bar end penetrates a material of the short-circuiting ring; and forming a plurality of notches in the bar end to provide the bar end with a flexibility which is greater than a flexibility of a bar section adjacent to the bar end so that the bar end is able to undergo an elastic or plastic deformation, when the bar end is exposed to forces encountered during shrinkage of the material of the short-circuiting ring, as the short-circuiting ring is cast onto the axial end of the rotor laminated core and the material solidifies, 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 an 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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Specification