A fan motor housing for a ram air fan, the fan motor housing comprising: an inner housing portion centered on a central axis, the inner housing portion having a first end and a second end positioned axially away from the first end; an outer housing portion centered on the central axis, the outer housing portion having a first end and a second end positioned axially away from the first end, wherein the outer housing portion comprises: a first thickened wall section with a first end and a second end; a stator interface section with a first end connected to the second end of the first thickened wall section and a second end, wherein the stator interface section further comprises: a radially outer surface positioned a first radius R 1 away from the central axis; a first radially inner surface positioned a second radius R 2 away from the central axis; a second radially inner surface positioned a third radius R 3 away from the central axis; and a third radially inner surface positioned the second radius R 2 away from the central axis; and wherein the first radius R 1 is larger than the second radius R 2 and the third radius R 3; and wherein the third radius R 3 is larger than the second radius R 2; and a second thickened wall section with a first end connected to the second end of the stator interface section and a second end; and a disk portion connecting the first end of the outer housing portion to the first end of the inner housing portion. an inner housing portion centered on a central axis, the inner housing portion having a first end and a second end positioned axially away from the first end; an outer housing portion centered on the central axis, the outer housing portion having a first end and a second end positioned axially away from the first end, wherein the outer housing portion comprises: a first thickened wall section with a first end and a second end; a stator interface section with a first end connected to the second end of the first thickened wall section and a second end, wherein the stator interface section further comprises: a radially outer surface positioned a first radius R 1 away from the central axis; a first radially inner surface positioned a second radius R 2 away from the central axis; a second radially inner surface positioned a third radius R 3 away from the central axis; and a third radially inner surface positioned the second radius R 2 away from the central axis; and wherein the first radius R 1 is larger than the second radius R 2 and the third radius R 3; and wherein the third radius R 3 is larger than the second radius R 2; and a second thickened wall section with a first end connected to the second end of the stator interface section and a second end; and a first thickened wall section with a first end and a second end; a stator interface section with a first end connected to the second end of the first thickened wall section and a second end, wherein the stator interface section further comprises: a radially outer surface positioned a first radius R 1 away from the central axis; a first radially inner surface positioned a second radius R 2 away from the central axis; a second radially inner surface positioned a third radius R 3 away from the central axis; and a third radially inner surface positioned the second radius R 2 away from the central axis; and wherein the first radius R 1 is larger than the second radius R 2 and the third radius R 3; and wherein the third radius R 3 is larger than the second radius R 2; and a radially outer surface positioned a first radius R 1 away from the central axis; a first radially inner surface positioned a second radius R 2 away from the central axis; a second radially inner surface positioned a third radius R 3 away from the central axis; and a third radially inner surface positioned the second radius R 2 away from the central axis; and wherein the first radius R 1 is larger than the second radius R 2 and the third radius R 3; and wherein the third radius R 3 is larger than the second radius R 2; and a second thickened wall section with a first end connected to the second end of the stator interface section and a second end; and a disk portion connecting the first end of the outer housing portion to the first end of the inner housing portion.