plurality of offset recesses 36 which comprise a series of spaced notches positioned in a generally circular pattern to respectively receive alternate waves of the wave spring 22 although recesses 34 and 36 are shown in fig3 and 4 in both surfaces 28 and 30 as is preferred in the alternative embodiments recesses may also be provided in just one of the surfaces 28 or 30 the recesses 34 and 36 allow the spring 22 to compress in accordance with the present invention further the recesses 34 and 36 provide further frictional resistance to secure the stator 18 against rotation reducing the axial force that is required to maintain the position of the stator 18 with less axial force required the wave spring 22 can be made of thinner material and the forces on fastener 24 are reduced reducing the cost and effort required for assembly the recesses 34 and 36 can also be used to locate the position of the stator 18 and provide a means for indexing the stator position as more fully discussed below in fig5 the preferred embodiment of the present invention is shown schematically including a wave spring 22 the wave spring 22 is positioned between surface 38 at the end 18a of the stator 18 and a surface 40 of the support chassis 20 the wave spring 22 and surfaces 38 and 40 may be arranged in accordance with the embodiments of fig2 4 in like manner to surfaces 28 and 30 it is understood in accordance with the present invention that wave springs 22 may be employed at both ends of the stator 18 in positions such as shown.