Hi $!$ I need to solve this exercise. My problem is that I have problems for calculating the torque needed for the acceleration phase since at exercise $5$ not a single motor fit for my results.

For now for exercise $1,$ I have a torque needed for acceleration phase M$\_$acc about $5\mathrm{.}62$ Nm$.$

For exercise $3,$ for acceleration phase, I have used the following equation : M$\_$gb$=$M$\_$acc$/($N $*$e$)+($J$\_$load$/($N$*$N$)+$J$\_$gb$)*$a$\_$load$*$N$.$

With M$\_$gb the torque needed by the gearbox, N the gear ratio, J$\_$load the inertia of the load $($the system including the belt, the product and the $2$ rollers$),$ J$\_$gb the inertia of the gearbox, a$\_$load the angular acceleration of the load and e the efficiency of the gearbox.

Can you tell me what is wrong with my equation and help me find the solution to this problem please $?$