As an example, look at a person riding a bicycle, with the individual acting like the electric motor. If that person tries to ride that bike up a steep hill in a gear that’s created for low rpm, she or he will struggle as
they try to maintain their balance and achieve an rpm that will permit them to climb the hill. However, if they shift the bike’s gears right into a velocity that will produce a higher rpm, the rider will have
a much easier time of it. A continuous force could 
be applied with smooth rotation being offered. The same logic applies for commercial applications that require lower speeds while preserving necessary
torque.
• Inertia complementing. Today’s servo motors are producing more torque in servo gearbox accordance with frame size. That’s due to dense copper windings, lightweight materials, and high-energy magnets.
This creates greater inertial mismatches between servo motors and the loads they are trying to move. Using a gearhead to better match the inertia of the motor to the inertia of the load allows for utilizing a smaller electric motor and outcomes in a far more responsive system that is easier to tune. Again, this is attained through the gearhead’s ratio, where in fact the reflected inertia of the strain to the electric motor is decreased by 1/ratio2.
Recall that inertia may be the way of measuring an object’s level of resistance to change in its movement and its own function of the object’s mass and form. The greater an object’s inertia, the more torque is required to accelerate or decelerate the thing. This means that when the strain inertia is much bigger than the engine inertia, sometimes it can cause excessive overshoot or boost settling times. Both conditions can decrease production line throughput.
However, when the motor inertia is bigger than the strain inertia, the engine will require more power than is otherwise essential for the particular application. This improves costs because it requires paying more for a motor that’s larger than necessary, and since the increased power intake requires higher operating costs. The solution is to use a gearhead to match the inertia of the engine to the inertia of the strain.