As an example, look at a person riding a bicycle, with the person acting like the electric motor. If that person tries to trip that bike up a steep hill in a gear that’s made for low rpm, she or he will struggle as
they attempt to maintain their stability and achieve an rpm that may allow them to climb the hill. However, if indeed they change the bike’s gears into a quickness that will create a higher rpm, the rider will have
a much easier time of it. A continuous force could be applied with soft rotation being offered. The same logic applies for commercial applications that require lower speeds while keeping necessary
torque.
• Inertia matching. Today’s servo motors are producing 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. Using a gearhead to raised match the inertia of the electric motor to the inertia of the load allows for utilizing 
a smaller engine and outcomes in a far more responsive system that’s simpler to tune. Again, this is accomplished through the gearhead’s ratio, where the reflected inertia of the load to the electric motor is decreased by 1/ratio2.
Recall that inertia may be the way of measuring an object’s resistance to change in its motion and its own function of the object’s mass and shape. The higher an object’s inertia, the more torque is needed to accelerate or decelerate the thing. This implies that when the load inertia is much larger than the motor inertia, sometimes it could cause extreme overshoot or enhance settling times. Both circumstances can decrease production series throughput.
However, when the motor inertia is larger than the strain inertia, the 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 by using a gearhead to match the inertia of the electric motor to the inertia of the load.
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