BLDC sine wave using a L298n - Electronics Forums

Author Topic: BLDC sine wave using a L298n  (Read 12939 times)

navanod

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BLDC sine wave using a L298n
« on: January 03, 2018, 04:05:26 PM »
Hi all and greetings.

I have been working on a BLDC project for a while trying to use the sine wave tables to generate like it was shown in the stroboscope project.  I do get movement but it is certainly not as smooth as I would like,  I have tried more steps and this helped a little but still not great.

I am wondering id this is really not the fault of the l298n?

Ive got one dev kit from TI here for a fancy fan controller and at 7 hz the same motor is silky smooth.


love to hear your thoughts on the old L298n for slow speed bldc control.

cheers

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BLDC sine wave using a L298n
« on: January 03, 2018, 04:05:26 PM »

orion_pt

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Re: BLDC sine wave using a L298n
« Reply #1 on: January 05, 2018, 12:02:24 PM »
I'm doing exactly the same and having the same problem as you. I also increased number of steps and it improved. The 10 bit resolution makes it worse but reducing the pwm speed makes it better but you get the frequency noise. I think the 298 is having problems with pwm signal creating noise in the output. Could it be necessary to have DAC between arduino and the 298 or a different driver would be a better choice?

 

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