TMS320F28027F: F28027F + DRV8305

Vaishali Sabnis

Part Number: TMS320F28027F
Other Parts Discussed in Thread: DRV8305

Hello

Greetings of the day!!!

I am using F28027F + DRV8305 for driving BLDC motor. I am using projlab05b.c. In projlab05b.c i have written follwing code

float A_RPM=5.0;count++;
if(count>390)
{
count=0;

A_RPM=-A_RPM;

}
CTRL_setSpd_ref_krpm(ctrlHandle,gMotorVars.SpeedRef_krpm=_IQ(A_RPM));

But here i am setting A_RPM to fixed value 5000rpm and then motor oscillates.

But i want to set rpm in gui in the range 2000 to 20000rpm at SpeedRef_krpm veriable and depending on set speed motor should oscillate.

I tried to read gMotorVars.SpeedRef_krpm as A_RPM=gMotorVars.SpeedRef_krpm. But getting error.

Help me do this.

over 1 year ago

0 Yanming Luo over 1 year ago

TI__Guru** 109820 points

Vaishali Sabnis said:
if(count>390)
{
count=0;

A_RPM=-A_RPM;

}

Is the above code executing in a timer? or in background loop? How long will the motor run with positive speed and then switch to negative speed?

The motor running time with positive or negative speed must be greater than the enough time according to the motor and system.

0 Vaishali Sabnis over 1 year ago in reply to Yanming Luo

Prodigy 180 points

It is in background loop. In 1min motor oscillates 190 time.

0 Yanming Luo over 1 year ago in reply to Vaishali Sabnis

TI__Guru** 109820 points

Vaishali Sabnis said:
In 1min motor oscillates 190 time.

What do you mean this? Do you want to change the motor rotation direction 190 times every minute? And run the motor from 2000rpm~20000rpm to -2000~-20000rpm in (60/190) second?

If yes, it's impossible to achieve this with sensorless-FOC. You have to use sensored-FOC solution.

0 Vaishali Sabnis over 1 year ago in reply to Yanming Luo

Prodigy 180 points

Okay

Thank you

I will go for sensored FOC Solution

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TMS320F28027F: F28027F + DRV8305