The ornamental design for a motoractuator, as shown and described.
FIG. 1 is a front, bottom and left-side perspective view of a motor actuator showing my new design;
FIG. 2 is a rear, top and left-side perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a left-side elevation view thereof;
FIG. 6 is a right-side elevation view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines depict portions of the motor actuator that form no part of the claimed design. The dot-dash boundary lines define the boundary of the claimed design and form no part of the claimed design.