Rotor structure
A rotor structure comprises core laminations, two ring covers, and a hollow shaft. The core laminations have a horizontal side with multiple equally angled lightening holes. Each ring cover has a horizontal inner surface that contacts the outermost horizontal side of the core lamination. The horizontal inner surface of the ring covers features guiding protrusions corresponding to the lightening holes. The guiding protrusions form grooves at their end surfaces that serve as oil inlets and outlets located along the inner and outer circumferential surfaces of the ring covers, respectively. The core laminations and the ring covers are mounted on the hollow shaft, and the oil inlet of the ring cover is fluidly connected to the oil injection hole of the hollow shaft. The guiding protrusions can slow down the flow velocity centrifugally to ensure the consistency of the oil inlet and outlet.
1 . A rotor structure comprising:
at least one core lamination having a horizontal side and multiple perforations, wherein the perforations consist of multiple lightening holes and multiple magnet mounting holes, and each contour of the lightening holes is identical, equidistant from a center, and arranged at equal angles;
two ring covers each having a horizontal inner surface contacting an outermost horizontal side of the core lamination, the horizontal inner surface having multiple guiding protrusions corresponding to the lightening holes one at a time, with an end surface forming one portion of a groove, some of the grooves having the other portion forming a channel inlet located on an inner circumferential surface of the ring covers, while the other portion of the other grooves forming a channel outlet located on an outer circumferential surface of the ring covers, the channel inlet and the channel outlet being staggered around a circumferential direction; and
a hollow shaft where the core lamination and the two ring covers are mounted on an outside of the hollow shaft, and the channel inlet of the ring covers is fluidly connected to an oil injection hole on the hollow shaft, wherein the guiding protrusions enter an inside of the lightening holes with respect to the horizontal inner surface.
2 . The rotor structure according to claim 1 , wherein an interior of the hollow shaft is provided with an oil duct having multiple oil guide holes distributed along an axial direction.
3 . The rotor structure according to claim 1 , wherein a junction between a side surface and the end surface of the guide protrusions is formed with a rounded chamfer.
4 . The rotor structure according to claim 1 , wherein the outer contour of the guide protrusions is spaced from the contour of the lightening holes.
5 . The rotor structure according to claim 1 , wherein the other portion of the grooves forms a radial groove relative to the horizontal inner surface.
6 . The rotor structure according to claim 5 , wherein the junction between the radial groove and the grooves formed on the guiding protrusions is an arcuate groove.
7 . The rotor structure according to claim 1 , wherein a portion of a side surface of the guiding protrusions facing the hollow shaft has an arc extending in the circumferential direction.