Choosing a BLDC driver

Christoffer Cederberg

Other Parts Discussed in Thread: DRV8305, DRV8301, DRV8353, DRV8350, MOTORWARE, DRV8353RS-EVM

Hi!

I'm in the beginning of a project at Lund University where we will use a BLDC motor to drive a gearbox. We want to drive it the motor on a low rpm, around 200 rpm. I would like to be able to use a MCU to control the motor (via the driver). A magnetic encoder (as5048) will be used for feedback. The motor that will be used is the following:

https://hobbyking.com/en_us/9225-90kv-turnigy-multistar-brushless-multi-rotor-motor.html?queryID=&objectID=40515&indexName=hbk_live_magento_en_us_products

I have seen several projects online where the DRV8305 is used for similar applications.

My question is if there are any of TI's drivers that are better suited for the application?

Best regards / Christoffer

over 5 years ago

0 Adam Sidelsky over 5 years ago

TI__Guru 65240 points

Christoffer,

Thanks for posting on the MD forum!

Could you tell us your max system voltage?

Do you have code for the encoder and what MCU are you using?

Regards,

-Adam

0 Christoffer Cederberg over 5 years ago in reply to Adam Sidelsky

Intellectual 470 points

Hi!

And thank you for answering! The maximum voltage is between 34 V and 52 V.

The encoder is this one: https://www.digikey.se/product-detail/sv/ams/AS5048A-HTSP-500/AS5048A-HTSP-500CT-ND/3188617

The MCU will be the ESP32-D0WDQ6.

There are two more things that is important, the driver should be able to brake the motor and also keep the motor at its position. See the following video:

photos.app.goo.gl/rsBHbrQZhkn638cq9

In this video the driver was the DRV8301. So I basically know that either the DRV8305 or the DRV8301 could do the job but are there any other driver that will be better when it comes to spinning the motor at low rmp, braking and holding the motor at a certain position?

Best regards / Christoffer

0 Aaron Barrera over 5 years ago in reply to Christoffer Cederberg

TI__Mastermind 26046 points

Hi Christoffer,

Based on your voltage and application, we would recommend the DRV835x gate driver. It is rated for up to 100-V so the system can have extra headroom in the case of transients. There are the DRV8350 and DRV8353 gate drivers, with the main difference being that the DRV8353 has three integrated CSAs for current feedback from each phase and the DRV8350 does not.

The only downside is in maintaining position control. Braking will slow down the motor but not actively hold the motor position. With the right MCU firmware, you can actively brake the motor by opposing changes to the absolute position of the motor, but that requires firmware we don't have.

We are more than happy to help with the gate driver and power MOSFET stage, but we do not develop any firmware for non-TI MCUs related to the encoder and active braking (position holding). However, you may be able to inquire with TI's C2000 team to see if we have position control code available in TI's InstaSPIN library. I know there are lab examples along with a User Guide available in Motorware, which may have the position control algorithm you need.

Would you like me to loop you to their team for firmware support?

Let us know if you are in need of any more gate driver assistance!

0 Christoffer Cederberg over 5 years ago in reply to Aaron Barrera

Intellectual 470 points

Hi!

Thanks for the help! I will order the DRV8353RS-EVM to get started!

Yes, I'd like to get in touch with the C2000 team for firmware support. It would be great!

Thanks again for the help, TI's support is the best!

Kind regards / Christoffer

0 Aaron Barrera over 5 years ago in reply to Christoffer Cederberg

TI__Mastermind 26046 points

Hello Christoffer,

No problem! I will forward this thread to their team and they should be able to assist you.

0 Christoffer Cederberg over 5 years ago in reply to Aaron Barrera

Intellectual 470 points

Great, thanks!

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

TI__Guru** 115420 points

You might download the motorWare as the following link, and the related user's guide in the installed folder.

http://www.ti.com/tool/motorware

You could find the related DRV8353Rx software patch package and guide for motorWare as the below link.

https://www.ti.com/tool/DRV8353RS-EVM

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

Intellectual 470 points

Hi!

Thanks for the info. I have already tried to download the motorware but there is something wrong with the link because I can't download it. Do I need some special permission for downloading the motorware software?

Best regards / Christoffer