A key consideration of an electric motor and its basic variables dresses carefully, you can understand a little about the electric motors.

As a conjugate, which can also be called torque or moment is a measure of the effort required to rotate a motor shaft, i.e. strength, and experience and practice it is observed that to lift a weight by a process that is like a shaft, the force must be applied to handle, it must be examined for the length and the greater the crank, the lower force required.

Now if we double the size of the crank, the strength will be reduced by half. https://www.mrosupply.com/motors/ac-motors/inverter-vector-motors/2270345_y525_marathon-electric/

For example, if the bucket weighs 56 N and the average diameter of the drum is 0.20 m, wakes transmit a force of 56 N on the drum surface, this means that 0.10 m from the center axis.

To weigh it against then need 20 N on the handle, if the length is 0.40 m, as if double, moved much.