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Motor Phase Currents Unbalanced at High Torque Load

Question asked by Derek Cook on Oct 16, 2018
Latest reply on Oct 31, 2018 by Derek Cook



I am seeing something odd on my system. When running my system at 50Nm. I am seeing my RMS Phase current for A, B and C each around 4 amps apart from each other. 


Phase A = 49

Phase B = 45

Phase C = 53


When I measure with a meter, this is not the case. The phases are pretty balanced. The duty cycles output by the SVPWM are also all pretty much identical. 


With the meter:


Phase A = 51

Phase B = 48

Phase C = 48


Do you have a possible explanation on why my ADC readings would be unbalanced, when the current is actually not unbalanced? Where should I begin to look to debug this issue?