As an example, consider a person riding a bicycle, with the individual acting like the motor. If that person tries to trip that bike up a steep hill in a gear that’s designed for low rpm, she or he will struggle as
they try to maintain their stability and achieve an rpm which will allow them to climb the hill. However, if indeed they shift the bike’s gears right into a rate that will create a higher rpm, the rider will have
a much easier period of it. A continuous force could be applied with even rotation being supplied. The same logic applies for industrial applications that require lower speeds while preserving 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 want to move. Using a gearhead to better match the inertia of the electric motor to the inertia of the strain allows for utilizing a smaller engine and outcomes in a more responsive system that’s simpler to tune. Again, that is attained through the gearhead’s ratio, where in fact the reflected inertia of the strain to the motor 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 needed 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 line throughput.
On the other hand, when the electric motor inertia is larger than the load inertia, the motor will require more power than is otherwise necessary for the particular application. This boosts costs because it requires having to pay more for a electric motor that’s bigger than necessary, and since the increased power intake requires higher working costs. The solution 
is by using a gearhead to complement the inertia of the motor to the inertia of the strain.
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