RM48 InstaSpin

Hi Marcos,

I have referred your question to one of our experts who should get back with you shortly on this.  

Thanks for your patience,

Paul

I don't understand your question.

Do you mean that you want to control the speed and/or other things through an external analog device?

The RM46 project does support control through the Hyperterminal. http://www.ti.com/tool/drv8301-rm46-kit. The RM46 project is very similar to the RM48 project.

In the RM46 project:

  switch (drv.SCI_Command)
  {
   case '3':
    gGUIObj.CtrlType = 0;
    gGUIObj.DutyCmd = 0.3;
    PutText(drv.ecmpHandle, "Duty Cycle Mode Enabled\r\n");
    break;
   case '4':
    gGUIObj.CtrlType = 1;
    gGUIObj.TorqueCmd = 0.3;
    PutText(drv.ecmpHandle, "Current Mode Enabled\r\n");
    break;
   case '5':
    gGUIObj.CtrlType = 2;
    gGUIObj.SpdCmd = 0.3;
    PutText(drv.ecmpHandle, "Velocity Mode Enabled\r\n");
    break;
   case '6':
    gGUIObj.CtrlType = 3;
    gGUIObj.SpdCmd = 0.3;
    PutText(drv.ecmpHandle, "Cascade (Current + Velocity) Mode Enabled\r\n");
    break;
   case '7':
    gGUIObj.DutyCmd = 0;
    gGUIObj.CtrlType = 0;
    gGUIObj.SpdCmd = 0;
    gGUIObj.TorqueCmd = 0;
    PutText(drv.ecmpHandle, "Motor Stopped\r\n");
    break;
   case '8':
    drv.ecmpHandle->DiagFlag = !drv.ecmpHandle->DiagFlag;
    PutText(drv.ecmpHandle, "Watchdog Diagnostics Flag Toggled\r\n");
    break;
  } 

Here   gGUIObj.SpdCmd = 0.3; defines the speed.

 v->speedRPM = v->baseRPM * v->speed;

the default baseRPM is 1800RPM.

Regards,

Haixiao

I have been looking at this specific method in the RM48 version of this package and it looks something like this:

switch( drv->controlMode )
{
case(CURRENT):
drv->ref = gui->TorqueCmd;
drv->currentMode = 1;
drv->velocityMode = 0;
break;
case(VELOCITY):
drv->ref = gui->SpdCmd;
drv->currentMode = 0;
drv->velocityMode = 2;
break;
case(CASCADE):
drv->ref = gui->SpdCmd;
drv->currentMode = 1;
drv->velocityMode = 2;
break;
default:
drv->ref = gui->DutyCmd;
drv->currentMode = 0;
drv->velocityMode = 0;
break;
}

drv->dFuncStartup = gui->DFuncStartup;
drv->rampUpTime = gui->RampUpTime;
drv->beginStartRPM = gui->BeginStartRPM;
drv->endStartRPM = gui->EndStartRPM;
drv->advancedStartup = gui->AdvancedStartup;
drv->commErrorMax = gui->CommErrorMax;
drv->tripCnt = gui->TripCnt;
drv->currentStartup = gui->CurrentStartup;
drv->iMax = gui->IMax;
drv->minVDC = gui->MinVDC;
drv->maxVDC = gui->MaxVDC;

// Update monitor values
gui->SpeedRPM = drv->speedRPM;
gui->CurrentDisplay = gui->CurrentDisplay = drv->iDCFdbk*drv->mod6Handle->cntDirection;
gui->Poles = drv->poles;

gui->IMotor = gui->IMotor = drv->iDCFdbk*RW_CURRENT_GAIN*drv->mod6Handle->cntDirection;
gui->VBus = drv->vDCBus*RW_DCBUS_GAIN;
gui->BemfA = drv->iqVaIn;
gui->BemfB = drv->iqVbIn;
gui->BemfC = drv->iqVcIn;

gui->SpdMotor = SPEED_MEAS_CAP_Get_Speed_Output(drv->speedHandle);

gui->OTFlg = DRV_get_overTempFlg(drvHandle);
gui->OVFlg = DRV_get_overVoltageFlg(drvHandle);
gui->FaultMotor = DRV_get_bridgeFaultFlg(drvHandle);

I realize that this code has a lot of GUI feedback but I was wondering if drv->ref is the variable that controls the knob on the actual GUI. 

So in the end, the question, clearly stated, is that I have a voltage signal that runs anywhere from 2-3 volts and I wish to use this in place of the knob from the GUI. What I have done so far is changed the switch statement to have a raw number as drv->ref, and was unsuccessful in spinning the motor at a constant speed. If there is a different approach I should be taking, please let me know. I have also included the external voltage to be read in by the ADC.

Let me know if I can clear up the question anymore. Your advice is always helpful.

What you need to do is to change gui->SpdCmd instead of changing drv->ref. Or,

You can commend the

drv->ref = gui->SpdCmd;

I am afraid there is more than one place in the project. After that change the drv->ref to whatever value you want.

Regards,

Haixiao

So I went through the project and edited the lines where

drv->rev = gui->SpdCmd

and all the lines that contain gui->SpdCmd.

I was able to get some voltages being output, however, the behavior is chaotic.

Since I was able to get the different phases to output, although all of the voltages were the same, I will now ask a different question. 

Within the code, I don't think that just drv->ref is what controls the speed, solely.  

There are line that mention AdcResults1[x].value. These lines are gathering ADC data, even while nothing is being fed into the ADC. There are several different values that do this and I was wondering what these were. 

Also, since I changed the drv->ref and gui->SpdCmd to the different values with little result, I was wondering what the range of this variable was? is it -.95 ~ .95 like in the GUI knob?

Thank you.

There are four modes in the InstaSpin project, currect,  velocity, cascade, duty cycle, the drv->ref only impact the velocity and cascade mode.Speed does not control the other mode.

Which mode are you in?

Regards,

Haixiao

Hello Haixiao,

I am working with Marcos. We are using the velocity mode by giving the drv->ref a fixed value.

thank you,

Danny 

Marcos, Danny,

Did Haixiao's directions resolve your issue?  If so please hit the green "verify answer" button on Haixiao's post and we will close the thread.

Thanks!

Paul