Hi,
I don't know, but it looks like the battery current.
Maybe contact the manufacturer...
The motor current depends in a lot of parameters. Mainly the motor voltage. But also phase shift.
Lets say three phases , each has 230V RMS (referenced to star point) and you have a phase current of 10A RMS then the true power may be anything from [- 3 x IRMS x VRMS] to [zero] to [+ 3 x IRMS x VRMS]
.... While in one case the motor acts as generator. You are free to exclude this case.
Btw: for an ideal three phase inverter the drawn power and the drawn battery current should be constant (for constant linear loads, without overtones). This is not the case for single phase systems.
Klaus