As an example, consider a person riding a bicycle, with the individual acting like the engine. If see your face tries to trip that bike up a steep hill in a gear that’s made for low rpm, he or she will struggle as
they try to maintain their stability and achieve an rpm which will permit them to climb the hill. However, if they shift the bike’s gears right into a quickness that will produce a higher rpm, the rider could have
a much easier period of it. A constant force could be applied with soft rotation being offered. The same logic applies for industrial applications that require lower speeds while keeping necessary
torque.
• Inertia coordinating. Today’s servo motors are generating more torque relative to frame size. That’s due to dense copper windings, light-weight materials, and high-energy magnets.
This creates greater servo gearbox inertial mismatches between servo motors and the loads they want to move. Using a gearhead to raised match the inertia of the electric motor to the inertia of the load allows for utilizing a smaller motor and results in a more responsive system that is easier to tune. Again, that is achieved through the gearhead’s ratio, where the reflected inertia of the load to the engine is decreased by 1/ratio2.
Recall that inertia is the measure of an object’s level of resistance to improve in its motion 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 thing. This implies that when the strain inertia is 
much bigger than the engine inertia, sometimes it could cause excessive overshoot or enhance settling times. Both conditions can decrease production range throughput.
However, when the motor inertia is bigger than the load inertia, the electric motor will require more power than is otherwise essential for this application. This increases costs since it requires spending more for a motor that’s bigger than necessary, and since the increased power consumption requires higher working costs. The solution is by using a gearhead to match the inertia of the motor to the inertia of the strain.