hi everybody
I know that this question has not a direct relation with this forum but I'm working with arduino boards to control dc motors ( actually a robot) , in the equations I have moment of inertia term and I suppose the dc motor as a solid part but in the practical way the error is impressive and I should to calculate the both value of moment of inertia of rotor and stator of the dc motor, so could you please tell me the experimental way to calculate the moment of inertia of rotor and stator of the dc motor?
The moment of inertia only applies to the rotor, the stator doesn't turn (well I'd assume so!).
The moment of inertia is just the sum of mass scaled by the square of the distance from the rotation axis. Its units are kg m^2
You'll find formulae for standard shapes like cylinders if you search, you just need to know the dimensions and density or mass.
Moment of inertia is the rotational counterpart to mass in linear motion. You can simply take all the equations of linear motion and translate into rotational ones by substituing MoI for mass, angular velocity for velocity, angular acceleration for acceleration, angle for distance, torque for force.
All angular values are measured in radians, rad/s or rad/s^2 for this, NOT DEGREES or RPM or suchlike.
To measure MoI simply measure the angular acceleration under a known torque.