Rotor end flange for an electric motor

A cooling system for cooling a coil winding in a rotor, the cooling system including:

• an oil, wherein the oil is inserted into a center of the rotor;
• a rotor end flange, the rotor end flange defining a pole central axis and including:
• a plurality of poles, wherein the plurality of poles extend radially away from a rotational axis;
• pole shoes, wherein the pole shoes are disposed at radial distal ends of the poles;
• slots, wherein adjacent poles and adjacent pole shoes define the slots
• an outer surface,
• wherein the outer surface is disposed on an outer diameter of the rotor end flange, and
• wherein the outer diameter of the rotor end flange is in contact with poles of the rotor;
• an inner surface, wherein a portion of the inner surface is curved and has a radius of curvature (ROC), wherein the ROC directs an oil towards a plurality of grooves;
• a plurality of exit holes radially inward of the inner surface and positioned a distance away from the pole central axis towards a trailing side,
• wherein the trailing side nears the slots opposing a direction of rotation, and
• wherein the oil is released from the rotor into the rotor end flange through the plurality of exit holes,
• wherein the plurality of grooves are disposed on the outer surface and extend through the inner surface to allow the oil to flow from the inner surface to the outer surface, and
• wherein the plurality of grooves extend axially allowing the oil to spread across the coil winding,
• wherein the oil is released from the rotor end flange through the plurality of grooves and spreads across the coil winding.

A rotor end flange for cooling a coil winding in a rotor, the rotor end flange defining a pole central axis and including:

• a plurality of poles, wherein the plurality of poles extend radially away from a rotational axis;
• pole shoes, wherein the pole shoes are disposed at radial distal ends of the poles;
• slots, wherein adjacent poles and adjacent pole shoes define the slots
• an outer surface,
• wherein the outer surface is disposed on an outer diameter of the rotor end flange, and
• wherein the outer diameter of the rotor end flange is in contact with poles of the rotor;
• an inner surface, wherein a portion of the inner surface is curved and has a radius of curvature (ROC),
• wherein the ROC directs an oil towards a plurality of grooves,
• wherein the ROC of the inner surface increases from the pole central axis to a leading side,
• wherein the ROC of the inner surface increases from the pole central axis to a trailing side at a different rate,
• wherein the leading side is opposite of the trailing side and nears the slots facing a direction of rotation, and
• wherein the trailing side nears the slots opposing the direction of rotation;
• and
• a plurality of exit holes radially inward of the inner surface,
• wherein the oil is released from the rotor into the rotor end flange through the plurality of exit holes, and
• wherein the plurality of exit holes is aligned to the pole central axis,
• wherein the plurality of grooves are disposed on the outer surface and extend through the inner surface to allow the oil to flow from the inner surface to the outer surface, and
• wherein the plurality of grooves extend axially allowing the oil to spread across the coil winding.