Electric motor rotor
First Claim
1. A rotor assembly for an electric motor, comprising:
- a first plurality of laminations arranged axially with each defining therethrough a first plurality of slots open to an outer periphery thereof;
a second plurality of laminations arranged axially with each defining therethrough a second plurality of slots open to an outer periphery thereof;
a support disk positioned between the first and second plurality of laminations and defining therethrough a plurality of closed slots aligned with the first and second plurality of slots of each of the first and second plurality of laminations respectively, the support disk having an axial thickness greater than axial thicknesses of each lamination in each of the first and second plurality of laminations;
a plurality of rotor bars extending through the aligned plurality of slots of each of the first and second plurality of laminations and the support disk;
a first end ring defining a plurality of apertures engaging first ends of the plurality of rotor bars; and
a second end ring defining a plurality of apertures engaging second ends of the plurality of rotor bars opposite the first ends thereof;
wherein, with the plurality of rotor bars extending through the plurality of closed slots defined therethrough, the support disk minimizes radial expansion of the plurality of rotor bars between the first and second end rings during rotation of the rotor assembly.
3 Assignments
0 Petitions
Accused Products
Abstract
A rotor of an electric machine is disclosed that resists expansion of the rotor components even at high rotational speed. The rotor includes first and second pluralities of laminations having slots to accept rotor bars. A support disk, also having slots, is placed between the laminations. The support disk, into which the rotor bars are slid, restrains the rotor bars from bending outwardly at high rotational speeds of the rotor. The rotor bars are further restrained at the ends by end rings, which have apertures into which ends of the rotor bars are placed. In some embodiments, containment rings are placed over axial extension of the end rings to prevent outward bowing at high speeds. In some embodiments, the rotor includes a stiffener sleeve to provide additional resistance to expansion during high rotational speeds.
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Citations
20 Claims
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1. A rotor assembly for an electric motor, comprising:
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a first plurality of laminations arranged axially with each defining therethrough a first plurality of slots open to an outer periphery thereof; a second plurality of laminations arranged axially with each defining therethrough a second plurality of slots open to an outer periphery thereof; a support disk positioned between the first and second plurality of laminations and defining therethrough a plurality of closed slots aligned with the first and second plurality of slots of each of the first and second plurality of laminations respectively, the support disk having an axial thickness greater than axial thicknesses of each lamination in each of the first and second plurality of laminations; a plurality of rotor bars extending through the aligned plurality of slots of each of the first and second plurality of laminations and the support disk; a first end ring defining a plurality of apertures engaging first ends of the plurality of rotor bars; and a second end ring defining a plurality of apertures engaging second ends of the plurality of rotor bars opposite the first ends thereof; wherein, with the plurality of rotor bars extending through the plurality of closed slots defined therethrough, the support disk minimizes radial expansion of the plurality of rotor bars between the first and second end rings during rotation of the rotor assembly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A rotor assembly for an electric motor, comprising:
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a first plurality of laminations arranged axially with each defining therethrough a first plurality of slots; a second plurality of laminations arranged axially with each defining therethrough a second plurality of slots; a support disk positioned between the first and second plurality of laminations and defining therethrough a plurality of slots aligned with the first and second plurality of slots defined through each of the first and second plurality of laminations respectively; a plurality of rotor bars extending through the aligned plurality of slots defined through each of the first and second plurality of laminations and the support disk; a first end ring defining a plurality of apertures engaging first ends of the plurality of rotor bars; a second end ring defining a plurality of apertures engaging second ends of the plurality of rotor bars opposite the first ends thereof; and a stiffener sleeve extending through the first and second plurality of laminations, the support disk and the first and second end rings; wherein the support disk and the first and second end rings are press fit onto the stiffener sleeve. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A rotor assembly for an electric motor, comprising:
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a first plurality of laminations arranged axially with each defining therethrough a first plurality of slots; a second plurality of laminations arranged axially with each defining therethrough a second plurality of slots; a support disk positioned between the first and second plurality of laminations and defining therethrough a plurality of slots aligned with the first and second plurality of slots defined through each of the first and second plurality of laminations respectively; a plurality of rotor bars extending through the aligned plurality of slots defined through each of the first and second plurality of laminations and the support disk; a first end ring defining a plurality of apertures engaging first ends of the plurality of rotor bars, the first end ring including a first extension extending axially away from the first and second plurality of laminations; a second end ring defining a plurality of apertures engaging second ends of the plurality of rotor bars opposite the first ends thereof, the second end ring including a second extension extending axially away from the first and second plurality of laminations; a stiffener sleeve extending through the first and second plurality of laminations, the support disk, the first and second end rings and the first and second extensions; and first and second containment rings clamped around outer peripheral surfaces of the first and second extensions respectively to secure the first and second extensions to the stiffener sleeve. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification