The ornamental design for a motor, as shown and described.
FIG. 1 is a front perspective view of a motor showing my new design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is a is a right side view thereof; and,
FIG. 8 is a left side view thereof.
The uneven-length style broken lines immediately adjacent to the shaded areas define the bounds of the claimed design and form no part thereof. The even length broken lines depicting the remainder of the motor form no part of the claimed design.