As an example, look at 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’s designed for low rpm, she or he will struggle as
they try to maintain their stability and achieve an rpm which will permit them to climb the hill. However, if indeed they change the bike’s gears into a swiftness that will create a higher rpm, the rider could have
a much easier time of it. A continuous force can be applied with clean rotation being supplied. The same logic applies for industrial applications that want lower speeds while keeping necessary
torque.
• Inertia matching. 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 servo gearbox creates greater inertial mismatches between servo motors and the loads they want to move. Utilizing a gearhead to raised match the inertia of the motor to the inertia of the load allows for using a smaller motor and outcomes in a far more responsive system that’s easier to tune. Again, this is achieved through the gearhead’s ratio, where in fact the reflected inertia of the load to the motor is decreased by 1/ratio2.
Recall that inertia may be the measure of an object’s level of resistance to improve in its movement and its function of the object’s mass and form. The higher an object’s inertia, the more torque is needed to accelerate or decelerate the thing. This means that when the load inertia is much larger than the engine inertia, sometimes it can cause excessive overshoot or increase settling times. Both conditions can decrease production series throughput.
On the other hand, when the engine inertia is larger than the strain inertia, the engine will require more power than is otherwise necessary 
for this application. This boosts costs since it requires having to pay more for a motor that’s larger than necessary, and since the increased power intake requires higher working costs. The solution is to use a gearhead to match the inertia of the electric motor to the inertia of the strain.