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It is not the job of a student to explain a formula but to use a formula to solve a problem.
In order to do this one must first understand the formula. He was not asking to have his homework done, but for an explanation of the formula or simply a website that would explain it.
The world would be better off if we all helped each other without mocking or deriding.
Especially young people who are looking to more expierenced people for guidence.

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thanks for the reply.....
maybe this will help to understand that formula...
that formula was made in laplace...and  you can see their explanation...
does anybody know the relation between voltage and speed motor DC??
my argument :"bigger voltage will make the speed faster...but its speed change doesn't linear..."
is there any argument????

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hi henry,

The T(t) is the instantaneous Torque of the motor with respect to time and its composed of the 'B' and 'J'
Torque, B component is due to the angular rotation and the J component is due to the acceleration of the motor, both with respect to time.

If the motor is at a steady angular velocity, ie: not accelerating the J component is zero.
So the Torque = B.


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