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Anti cogging, suppressing torque ripple?

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Wed, 2022-01-19 11:33

#1

Alistair Goodman

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Anti cogging, suppressing torque ripple?

Hi guys,

I am using my VESC and BLDC motor as a variable brake, and need smooth operation at low speeds, however due to the torque ripple of the motor I am experiencing some problems.

I am wondering if anyone has looked into or used any anti-cogging algorithms like those discussed here https://hackaday.com/2016/02/23/anti-cogging-algorithm-brings-out-the-best-in-your-hobby-brushless-motors/ ?

What do you guys think of this, is there a place for this in the VESC code and how easy could it be implemented?

Any input is really appreciated!

Thanks

AG

Wed, 2022-01-19 13:43

#2

frank

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I guess you want to attach an AS5047P sensor in this case.

https://trampaboards.com/resources/manuals/207.pdf

Thu, 2022-01-20 10:33

(Reply to #2) #3

Alistair Goodman

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Thanks Frank, I assume you're saying that using this sensor will provide the appropriate position resolution to implement some torque ripple compensation? I would still need to implement my own torque correction algorithm though?

Thanks!

Ali goodman

Thu, 2022-01-20 10:42

#4

frank

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With sensors it should be very smooth throughout the entire low speed RPM range.

Thu, 2022-01-20 11:11

#5

Alistair Goodman

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Great thanks, I am currently using a 1024 bit incremental encoder, do you think this sensor will work much better at low speeds?

Ali goodman