The ornamental design for a portion of a controller primarily intended for an electricmotor, as shown and described.
FIG. 1 is a front elevational view of a portion of a controller primarily
intended for an electric motor showing my new design, the remainder of the
controller shown in broken lines form no part of the claimed design;
FIG. 2 is a left side elevational view thereof;
FIG. 3 is a front, bottom, and left side perspective view thereof;
FIG. 4 is a front, top, and right side perspective view thereof; and,
FIG. 5 is a front, top, and right side perspective view thereof, with a
removable component detached.