What is the stator voltage

Hello guys! I built the FOC parameter identification function based on RLS on simulink, and planned to integrate the generated code in the SimpleFOC project, but I can’t distinguish the difference between the stator voltage (stator_voltage Vs_d, stator_voltage Vs_q) and the rotor voltage (rotor_voltage Vs_d, rotor_voltage Vs_q) .
why is the waveform of the stator voltage like this? :sweat_smile: