Change PWM Frequency of STM Microcontrollers

1

Hi All,

I am currently working on a project in which I am using Infineon IXF, 007T driver, for running the BLDC Motor. Using Arduino as a microcontroller the setup works fine but the driving IC gets extremely hot after a few minutes. The reason is high switching loss and it is recommended to lower down the PWM frequency. Although the Arduino is set to a fixed PWM frequency of 32 K Hz, I lowered it to 4 kHz by changing the register’s value but it was causing electrical noise.

Now I am using STM32 Nucleuo F030R8 microcontroller but by default, the controller frequency is set to 1 kHz, by changing the driver.pwm_frequency the frequency remains the same. I am using Platform Io IDE.

I am new to STM to not familiar with their registers. Kindly, can someone help me with how to change the PWM frequency to 10 K Hz?

Many Thanks,
Moid Khan

2

Hey @MoidKhan!

So, by default when using the SimpleFOC you should have the pwm frequency of 25kHz for the stm32 devices.
Are you sure you’re using the stm32duino?
Which version are you using?

3

The Microcontroller I have is ST Nucleo-F030R8. I am using Platform IO IDE, for uploading and writing the code.

Thanks

4

You’ll need to install the stm32 support for the stm32 devices based on GitHub - stm32duino/Arduino_Core_STM32: STM32 core support for Arduino

I am not using the platformio so I’m not sure how to do it exactly :smiley:
But for the arduino ide it is very easy though.

5

Many Thanks. I will switch to STM32duino and will Run the code there.

6

When using platformIO, please also pay attention to add the option:

lib_archive = false

to your platformio.ini file.

2 Likes
7

After switching to STM32duio, the code worked perfectly, Thanks

1 Like
8

Hey MoidKhan

I’m having the same issue, can you explain how to switch to STM32duio ?

Edit: I fixed it. For everyone else who runs into this issue:

put

lib_archive = false

into your platformio.ini and run a clean after that pwm should be settable

1 Like