Electric motor having an end frame

1. An electro-dynamic machine comprising:

a rotor shaft extending along an axis;

a bearing rotatably supporting the rotor shaft for rotation about the axis;

an inner housing having an outer surface and defining a bearing bore, the bearing bore receiving and supporting the bearing;

an outer housing surrounding the inner housing;

a plurality of non-radial ribs extending from the outer housing to the inner housing, the non-radial ribs coupled to the inner housing substantially tangential to the outer surface; and

a plurality of radial ribs, wherein a none zero first portion of the radial ribs intersect one of the non-radial ribs, and wherein a none zero second portion of the radial ribs do not intersect any of the non-radial ribs.

2. The electro-dynamic machine of claim 1 , further comprising at least one annular rib disposed between the outer housing and the inner housing.

3. The electro-dynamic machine of claim 1 , wherein at least a portion of the non-radial ribs are arranged in v-shaped pairs, with a vertex of each v-shaped pair adjacent the outer housing.

4. The electro-dynamic machine of claim 3 , wherein the pairs are symmetrically disposed about the axis.

5. The electro-dynamic machine of claim 1 , wherein the non-radial ribs are arranged in three symmetrically disposed, v-shaped pairs, with a vertex of each v-shaped pair adjacent the outer housing.

6. The electro-dynamic machine of claim 1 , wherein the inner housing, the outer housing, and the plurality of non-radial ribs are formed as one-piece.

7. The electro-dynamic machine of claim 1 , further comprising a plurality of annular ribs, wherein the radial ribs, non-radial ribs, and annular ribs form a lattice coupling the outer housing to the inner housing.

8. A motor comprising:

a rotor;

a bearing;

a cylindrical inner housing having an outer surface and an inner bore disposed along an axis and sized to receive and support the bearing;

an annular outer housing disposed concentrically about the inner housing;

a first non-radial rib extending from the outer housing to the inner housing, the first non-radial rib arranged substantially tangentially to the outer surface;

a second non-radial rib extending from the outer housing to the inner housing, the second non-radial rib arranged substantially tangentially to the outer surface, the second non-radial rib cooperating with the first non-radial rib to define a V-shaped rib pair having a vertex adjacent the outer housing;

a first radial rib extending from the outer housing to the inner housing and spaced apart from each of the first non-radial rib and the second non-radial rib; and

a second radial rib extending from the outer housing to the inner housing and intersecting the first non-radial rib in the space between the outer housing and the inner housing.

9. The motor of claim 8 , wherein the V-shaped rib pair is a first V-shaped rib pair, and further comprising a third non-radial rib extending from the outer housing to the inner housing, the third non-radial rib arranged substantially tangentially to the outer surface;

a fourth non-radial rib extending from the outer housing to the inner housing, the fourth non-radial rib arranged substantially tangentially to the outer surface, the fourth non-radial rib arranged substantially tangentially to the outer surface, the fourth non-radial rib cooperating with the third non-radial rib to define a second V-shaped rib pair having a vertex adjacent the outer housing.

10. The motor of claim 9 , further comprising a fifth non-radial rib extending from the outer housing to the inner housing, the fifth non-radial rib arranged substantially tangentially to the outer surface;

a sixth non-radial rib extending from the outer housing to the inner housing, the sixth non-radial rib arranged substantially tangentially to the outer surface, the fifth rib cooperating with the sixth non-radial rib to define a third V-shaped rib pair having a vertex adjacent the outer housing.

11. The motor of claim 10 , wherein the three V-shaped rib pairs are radially symmetrically disposed about the axis.

12. The motor of claim 9 , wherein the first radial rib is disposed between the first V-shaped rib pair and the second V-shaped rib pair.

13. The motor of claim 8 , further comprising at least one annular rib disposed concentrically between the inner housing and the outer housing.