As an example, consider a person riding a servo gearbox bicycle, with the person acting like the engine. If see your face tries to ride that bike up a steep hill in a gear that is created for low rpm, she or he will struggle as
they attempt to maintain their balance and achieve an rpm which will permit them to climb the hill. However, if indeed they shift the bike’s gears into a velocity that will produce a higher rpm, the rider will have
a much easier period of it. A constant force can be applied with soft rotation being provided. The same logic applies for industrial applications that require lower speeds while maintaining necessary
torque.
• Inertia matching. Today’s servo motors are producing more torque in accordance with frame size. That’s because of dense copper windings, light-weight materials, and high-energy magnets.
This creates greater inertial mismatches between servo motors and the loads they are trying to move. Utilizing a gearhead to raised match the inertia of the motor to the inertia of the load allows for using a smaller engine and outcomes in a far more responsive system that is simpler to tune. Again, that is accomplished through the gearhead’s ratio, where in fact the reflected inertia of the strain to the engine is decreased by 1/ratio2.
Recall that inertia may be the way of measuring 
an object’s resistance to improve in its movement and its own function of the object’s mass and shape. The greater an object’s inertia, the more torque is required to accelerate or decelerate the object. This implies that when the load inertia is much bigger than the engine inertia, sometimes it could cause extreme overshoot or enhance settling times. Both circumstances can decrease production series throughput.
However, when the motor inertia is bigger than the load inertia, the engine will need more power than is otherwise essential for the particular application. This increases costs because it requires having to pay more for a engine that’s larger than necessary, and because the increased power intake requires higher operating costs. The solution is by using a gearhead to match the inertia of the motor to the inertia of the strain.