The ornamental design for a motordrivenriddle, especially for compost, as shown and described.
FIG. 1 is a side view of the motor driven riddle, especially for compost;
FIG. 2 is a view showing the output side; and,
FIG. 3 is a view showing the feeding side.
The broken line showing of the motor driven riddle, especially for compost is included for the purpose of illustrating portions of the motor driven riddle, especially for compost and forms no part of the claimed design.