As an example, consider a person riding a bicycle, with the individual acting like the electric motor. If see your face tries to trip that bike up a steep hill in a gear that is designed for low rpm, she or he will struggle as
they attempt to maintain their balance and achieve an rpm that will permit them to climb the hill. However, if indeed they shift the bike’s gears right into a quickness that will create a higher rpm, the rider will have
a much easier time of it. A constant force can be applied with clean rotation being offered. The same logic applies for industrial applications that want lower speeds while preserving necessary
torque.
• Inertia coordinating. Today’s servo motors are generating more torque in accordance with frame size. That’s due to dense copper windings, lightweight materials, and high-energy magnets.
This creates greater inertial mismatches between servo motors and the loads they want to move. Utilizing a gearhead to better match the inertia of the motor to the inertia of the strain allows for utilizing a smaller electric motor and results in a more responsive system that is easier to tune. Again, that is accomplished through the gearhead’s ratio, where in fact 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 level of resistance to change in its motion and its own function of the object’s mass and form. The greater an object’s inertia, the more torque is needed to accelerate or decelerate the object. This implies that when the load inertia is much bigger than the engine inertia, 
sometimes it could cause excessive overshoot or enhance settling times. Both conditions can decrease production line throughput.
On the other hand, when the motor inertia is larger than the load inertia, the electric motor will need more power than is otherwise essential for this application. This raises costs because it requires paying more for a engine that’s bigger than necessary, and since the increased power intake requires higher working costs. The solution is by using a gearhead to match the inertia of the engine to the inertia of the load.
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