• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 29 subscribers
  • Views 132 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

DRV8350R: Motor Heat

user6491799
Prodigy 105 points
Part Number: DRV8350R

hello ,  all :

we use DRV8350R to develop a BLDC Driver .The PCB have 3 DRV to drive 3 BLDC .

The motor we used have hall sensort , then depond on the hall sensor , we let DRV output different phase for BLDC to let it run .

When we test , one motor got heat . When we find the motor heat , we power off then power on for the PCB and then the motor didn't heat anymore .

Also when we find the motor heat , we didn't hear any noise of the motor .

Motor heat didn't happen many times .In fact , we power on for 20 PCBs , and run for seral days , it only happen 2 times .

Do you have any suggestions for the motor heat ? Or what need be checked to find the real reason of motor heat ?

Thanks

lining 

  • 0
    TI__Mastermind 18916 points

    Hi Lining, 

    Thanks for posting to the e2e forum - will browse through the info and aim to give a response soon. 

    I think we may need more information to find the root cause of the motor heat, and will try to give some suggestions of other things to check in the system 

    Thanks and Best Regards, 
    Andrew 

  • 0
    TI__Mastermind 18916 points

    Hi Lining, 

    Following up on this request, a few questions:

    1. when your motor is having excessive heat, 
      1. does the motor still spin reliably? or does it stop functioning? 
      2. how much heat are you observing? is there a temperature measurement?
    2. Are there any faults observing on the nFAULT pin of this device during the problem situation?
      1. If there is a fault observed, whether it's for gate-driver mis-operation or excessive temperature/voltage/current/etc... , then nFAULT pin pulls voltage Low to 0V to indicate that a Fault has occurred. 
    3. Does the motor heat only happen during a specific operating condition (example: high speed RPM) reliably?
      1. or is it very random? 
    4. is there any permanent damage on the motor/PCB that experienced the high heat? 

    Above points should be a good starting point, but I am thinking we will need much more information to debug the problem and find root cause 

    Thanks and Best Regards, 
    Andrew