This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Part Number: DRV10974
Customer used DRV10974 external drive motor. After the chip is powered on, the brushless motor started to accelerate at soft start. After the acceleration phase ended, the speed immediately became zero. After restarting the acceleration, the brushless motor could not maintain stable rotation. Customer would like to know what could be the reason for this?
Thanks for posting your question in MD forum. Looks like the device is stuck in open loop and unable to transition to closed-loop. IS the customer using DRV10974EVM or a custom board? First thing I would like to check is to make sure the motor that is used falls within the recommended application range shown in below table :
Next, I would recommend to check the tuning guide which explains two ways to tune the motor (Quick tuning and comprehensive tuning). The goal of quick tuning is to get the motor running quickly by inferring usable resistor values for the current (CS pin), lead time (ADV pin), and acceleration profile (RMP pin). Please check the comprehensive tuning section if the motor performance is not satisfactory after following the recommendations in Quick tuning section.
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
In reply to Vishnu Balaraj:
This is custom board. I have shared the document and he will review it first.
Additionally, he also would like to know why the chip is hot when the RCS resistor is configured to 115K?
In reply to Annie Liu:
I would recommend to follow the Layout guidelines in section 10 in the datasheet . Also, we recommend referring to the document explaining the best Practices for Board Layout of Motor Drivers.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.