As an example, consider 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 is designed for low rpm, he or she will struggle as
they attempt to maintain their stability and achieve an rpm that will permit them to climb the hill. However, if indeed they change the bike’s gears right into a speed that will produce a higher rpm, the rider could have
a much easier period of it. A continuous force can be applied with smooth rotation being offered. The same logic applies for commercial applications that require lower speeds while keeping necessary
torque.
• Inertia coordinating. Today’s servo motors are producing more servo gearbox torque in accordance with frame size. That’s due to dense copper windings, light-weight materials, and high-energy magnets.
This creates greater inertial mismatches between servo motors and the loads they want to move. Using a gearhead to raised match the inertia of the engine to the inertia of the strain allows for using a 
smaller electric motor and results in a more responsive system that is simpler to tune. Again, this is attained through the gearhead’s ratio, where the reflected inertia of the strain to the electric motor is decreased by 1/ratio2.
Recall that inertia is the way of measuring an object’s resistance to change in its movement and its own function of the object’s mass and shape. The higher an object’s inertia, the more torque is required to accelerate or decelerate the object. This implies 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 collection throughput.
However, when the engine inertia is bigger than the strain inertia, the engine will require more power than is otherwise necessary for the particular application. This raises costs since it requires paying more for a motor that’s larger than necessary, and since the increased power usage requires higher operating costs. The solution is by using a gearhead to match the inertia of the motor to the inertia of the strain.