As an example, consider a person riding a bicycle, with the individual acting like the electric motor. If see your face 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 allow them to climb the hill. However, if indeed they shift the bike’s gears into a rate that will produce a higher rpm, the rider will have
a much easier 
time of it. A continuous force can be applied with simple rotation being supplied. 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 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 are trying to move. Utilizing a gearhead to raised match the inertia of the engine to the inertia of the strain allows for utilizing a smaller engine and results in a more responsive system that is easier to tune. Again, this is achieved through the gearhead’s ratio, where in fact the reflected inertia of the load to the engine is decreased by 1/ratio2.
Recall that inertia may be the measure of an object’s resistance to change 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 object. This implies that when the load inertia is much larger than the engine inertia, sometimes it can cause extreme overshoot or increase settling times. Both conditions can decrease production range throughput.
On the other hand, when the engine inertia is larger than the load inertia, the electric motor will require more power than is otherwise necessary for this application. This boosts costs because it requires spending more for a motor that’s bigger than necessary, and since the increased power consumption requires higher operating costs. The solution is to use a gearhead to complement the inertia of the motor to the inertia of the load.
Would you such as some even more information regarding Servo Gearbox?