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# 1 gd2 is the value which is meant to check that whether a
given motor will mingle with an impeller or not. Its a
sought of age of fan and motor.
Technically , it tells us about the measure of the ability
of the motor to attain its a rated speed from rest.
This is calculated with the formula
4 x m x r2
m = mass of the impeller
r = radius of gyration
r shall be 0.4 times the radius of impeller
I hope its sought of clear now
Wiki User
∙ 10y ago
Wiki User
∙ 10y agoGD2 is the Moment of Inertia of the rotor of any rotating equipment. You see, as per Newton's laws, any object will not change its position of rest unless an external force acts on it. Isn't it? To make a rotor to come up to its rated speed from rest also you need to apply a force. And, this force is called the torque. As the mass of the object increases, the torque required also increases. A measure of this mass is the GD2. From this information one can calculate the time required for a motor to accelerate from rest top rated speed under rated supply conditions
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