Hi All, I have been using FEMM for a few years
now. Many thanks to Dave, excellent program. I have question on evaluating the A-J integral
and then calculating the self inductance from the result. I am modeling a 4 phase SRM with 8 stator
poles and 6 rotor poles. I am attempting to extract the torque profile and
inductance profile with one phase excited at constant current as the rotor
moves through one stroke. The torque magnitude and shape looks reasonable.
However I am having trouble understanding how to calculate the inductance
correctly. The profile shape looks as expected I am just concerned on the
magnitude of inductance. My method is:
I think I am running into trouble on the
coil current term. What is the correct coil current to use to evaluate the inductance
correctly? The value of one current block
or the sum of all current blocks.Also
this is actually amp-turns. Not the actual current flowing in the wire itself. Right? For instance: the current in one blockin
the model is defined as 11.15 MA/m^2. The coil area is 2.6903 x 10^-5 m^2. So
the magnitude of current in the coil block is 300 A-T. Is this the current I
use for the evaluation of self inductance using the A-J integral? Regards, Brad Frustaglio |