CCS/TMS320F28379D: Acoustic noise problem in hall sensored bldc control

Kaarthi Chandrasekaran

Part Number: TMS320F28379D
Other Parts Discussed in Thread: DRV8323

Tool/software: Code Composer Studio

Hi,

I am using a TMS320f28379D microcontroller with DRV8323 for hall sensor based bldc control. I took the PWM config and the commutation sequence from other ref designs. The motor is running fine but the acoustic noise is higher than normal. When checked the current waveform and values, it looks normal.

With the same motor and DRV8323, when connected with the MSP430 development board, i am getting lesser noise. But the current and temperature of the motor of both cases are the same. I verified the commutation sequences in MSP430 ref design and my code, both are ok.

I tried with open-loop duty control, current control with speed control, current control alone, and speed control alone.

Any comments would be grateful.

Regards,

kaarthi

over 5 years ago

0 Yanming Luo over 5 years ago

TI__Guru** 117280 points

You might check the hall sensor input signals and motor phase current to look if the commutation point is right. And you can try to change the PWM frequency, and tune the gains of current and speed controllers if you used.

And you can refer to the example project of hall sensor BLDC control with C2000 controller as the link below, even though the reference is not based on F28379D.

[FAQ] Trapezoidal Control of BLDC Motors Using Hall Effect Sensors on C2000 Controller

https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/855709?tisearch=e2e-sitesearch&keymatch=faq%3Atrue

0 Kaarthi Chandrasekaran over 5 years ago in reply to Yanming Luo

Prodigy 185 points

Hi Yamming luo,

Thanks for your response. sorry to reply so late.

I tried the above mentioned points but got no improvement.

And "change the pwm frequency" means higher switching frequency or lower?. I am right now configured with 20kHz.

Regards,

Kaarthi

0 Yanming Luo over 5 years ago in reply to Kaarthi Chandrasekaran

TI__Guru** 117280 points

Check the current, commutation signals, and PWM output waveforms, to make sure the hall sensor input is correctly used for the communication and the communication sequence is right. And check the feedback speed to know the noise is electrical or mechanical.

Please post some waveforms as mentioned above that could help us to understand your issue.

0 Yanming Luo over 5 years ago in reply to Yanming Luo

TI__Guru** 117280 points

I haven’t heard from you for two weeks, so I’m assuming you were able to resolve your issue. Please let me know if you have any questions. We would like to close this thread if no any further questions. Thanks.

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CCS/TMS320F28379D: Acoustic noise problem in hall sensored bldc control