This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TMS320F28069: problem with labs

Part Number: TMS320F28069

Hello,

We are using the high voltage kit (hvkit_rev1p1) with TMS320F28069 to control a BLDC motor. Using lab04, we are able to run the motor in torque mode fine. However, we need to have both torque and speed control modes for our design with hall sensors.(the reason for using hall sensor is that we need very high start up torque and FOC wouldn't help even after going through chapter 14 of the user guide and applying the suggested methods) Then we switched to lab11e which seems to be closest to what we need to start with. However, as we start increasing the ref speed using CCS, we can not go above 800rpm and we get some sort of faults and motor stops right way. Also, the actual motor speed reading on CS is all over the place fluctuating a lot.  We have the following questions:

1- Does any of the labs have torque+speed mode control with hall sensor?

2- why is motor speed rom reading is fluctuating with lab11e and motor stops running above 800 rpm?

Appreciate your urgent response.

Thanks

  • What are your identified motor parameters? Sometimes, issues with speed reporting can be tied back to incorrect motor parameters. Also, the speed control loop in lab11e is a cascade of speed and torque control PI loops. They are in effect a "torque+speed mode," but asks for just a speed reference. Are you needing a variable to command speed as well torque reference? When you say stops running, are you experiencing any faults? Over current trip? Does the debugger continue or go into an ISR trap? More information on the fault scenario will help

    Sean