Rs Online value is not stable, why?

Hi TI,

  The following code is for Rs Online, The initial  value for Rs re-calibration is roughly 10.5ohms, but right after that, this Rs value is updated by Rs_Online and this value jump to 18.01, and sometimes, after refreshed and updated its value to 3.48 ohms.  If I use this value to calculate motor temperature, then temperature can vary from -150  to 180 C, which is not acceptable. 

Do you know why this is happening? 

Thanks for help!

void runRsOnLine(CTRL_Handle handle)
{
  CTRL_Obj *obj = (CTRL_Obj *)handle;

  // execute Rs OnLine code
  if(gMotorVars.Flag_Run_Identify == true)
    {
      if(EST_getState(obj->estHandle) == EST_State_OnLine)
        {
          float_t RsError_Ohm = gMotorVars.RsOnLine_Ohm - gMotorVars.Rs_Ohm;

          EST_setFlag_enableRsOnLine(obj->estHandle,true);
          EST_setRsOnLineId_mag_pu(obj->estHandle,_IQmpy(gMotorVars.RsOnLineCurrent_A,_IQ(1.0/USER_IQ_FULL_SCALE_CURRENT_A)));

          if(abs(RsError_Ohm) < (gMotorVars.Rs_Ohm * 0.05))
            {
              EST_setFlag_updateRs(obj->estHandle,true);
            }
        }
      else
        {
          EST_setRsOnLineId_mag_pu(obj->estHandle,_IQ(0.0));
          EST_setRsOnLineId_pu(obj->estHandle,_IQ(0.0));
          EST_setRsOnLine_pu(obj->estHandle,_IQ(0.0));
          EST_setFlag_enableRsOnLine(obj->estHandle,false);
          EST_setFlag_updateRs(obj->estHandle,false);
          EST_setRsOnLine_qFmt(obj->estHandle,EST_getRs_qFmt(obj->estHandle));
        }
    }

  return;
} // end of runRsOnLine() function