Vane pump rotors

A system, comprising:

• a rotor configured to rotate about a rotor axis within a pump housing, the rotor comprising:
• a first end face configured to interface with a stationary port plate;
• a plurality of vane slots defined in the rotor and arranged circumferentially about the rotor axis, wherein each vane slot of the plurality of vane slots is configured to accept a respective vane therein, wherein each vane slot includes a straight portion and a round portion radially inward of the straight portion, wherein the round portion is configured to hold a fluid during rotation of the rotor;
• a plurality of lands, wherein each land of the plurality of lands extends circumferentially relative to the rotor axis from a leading edge to a trailing edge between two vane slots of the plurality of vane slots, wherein each land includes a portion of the first end face;
• a lubrication pad defined in an outer periphery of the first end face, and extending from the first end face into a land of the plurality of lands, wherein the lubrication pad extends from the leading edge to the trailing edge such that the lubrication pad is fed by the two vane slots to induce buildup of a lubrication film between the first end face and the stationary port plate in the lubrication pad;
• wherein a leading edge depth of the lubrication pad is deeper at or near the leading edge of the land and shallows in a circumferential direction of flow over the lubrication pad to a trailing edge depth, wherein the trailing edge depth is shallower at or near the trailing edge of the land than at the leading edge of the land, and wherein the leading edge depth of the lubrication pad is fluidically connected to the straight portion of a first vane slot of the two vane slots to draw fluid from the straight portion of the first vane slot.