This is an old revision of the document!
3-phase currents
All currents in FEEM are peak, so for RMS the values have to be scaled accordingly.
In order to set up a 3-phase system of currents, with the same amplitude of 1 A for each phase, and phase angles as indicted, the following strings should be entered in the appropriate current definition in FEMM magnetic model, with I denoting the imaginary number (I2 = -1):
I1 (at 0°) = 1
I2 (at +120°) = -0.5 + I * 0.866
I3 (at -120°) = -0.5 - I * 0.866
In order to use different amplitudes, these can be just multiplied by the required constant. For example, in order to achieve a current of 10 A rms in each phase (with the same angles), the values should be multiplied by 10 * 1.4142 = 14.142, hence:
I1 (at 0°) = 14.142
I2 (at +120°) = -7.0711 + I * 12.2474
I3 (at -120°) = -7.0711 - I * 12.2474
