How to determine the torque variation per cycle on a BLDC?

[josehdx]

Hello

I'm coming with a (maybe) basic question for the electrical experts here

For a given application where the fluctuation on speed is a major issue..... i need to find the moment of inertia and sizing all my components

My experience as mechanical is with 4 stroke engines where the flywheel is returning some of the kinetic energy to the crankshaft and the crankshaft generates a high kinetic energy on the expansion stroke

I know on electric motors (BLDC to be clear) will depend of the number of poles and phases and generally the graph looks constant if i may say that, but what i am looking for is the method to find this value, i mean, the torque maximum and minimun generated, the averages should be equal to the required torque.

Maybe someone can recommend a book and the name of the topic?

The governing equation is

I = Ke / (Coefficient of fluctuation * Avg angular speed^2)

Thanks