Unofficial
FEMM
documentation
by Dr Stan Zurek

User Tools

Site Tools

Trace: • 3-phase currents • Start
3-phase_currents

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision 		Previous revision
3-phase_currents [2021/04/10 00:22]
stanzurek 		3-phase_currents [2024/05/19 21:23] (current)
stanzurek
Line 3: Line 3:
 All currents in FEEM are peak, so for RMS the values have to be scaled accordingly. 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 value of **1 A peak** 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 (I<sup>2</sup> = -1):+In order to set up a 3-phase system of currents, with the same value of **1 A peak** for each phase, and phase angles as indicated, the following strings should be entered in the appropriate current definition in FEMM magnetic model, with ''I'' denoting the imaginary number (I<sup>2</sup> = -1):
  
 I1 (at 0°) = ''1''   I1 (at 0°) = ''1''  
Line 11: Line 11:
 I3 (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:+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 (so that the sqrt(2) scaling is also applied). Hence:
  
 I1 (at 0°) = ''14.142''   I1 (at 0°) = ''14.142''  
Line 18: Line 18:
  
 I3 (at -120°) = ''-7.0711 - I * 12.2474''   I3 (at -120°) = ''-7.0711 - I * 12.2474''  
 +
 +Note that you can multiply directly inside the input box, because the value will be evaluated correctly. So for example, typing in: \\ ''-0.5 * 14.142 - I * 0.866 * 14.142'' will set it to ''-7.0711 - I * 12.2474''.
  
 {{3phase_current.png}} Setting up the complex value of I2 {{3phase_current.png}} Setting up the complex value of I2
 +
 +
 +{{page>insert/paypal}}
  
3-phase_currents.1618006932.txt.gz · Last modified: 2021/04/10 00:22 by stanzurek

Page Tools

Donate Powered by PHP Valid HTML5 Valid CSS Driven by DokuWiki