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DRV10983EVM: A DRV10983 IC driving a Maxxon ECX SQUARE 16 L sensorless brushless BLDC motor switches off intermittently after a stall torque is encountered and continues to stop intermittently even after the stall condition is removed

Jain James
Prodigy 60 points
Part Number: DRV10983EVM
Other Parts Discussed in Thread: DRV10983, DRV10987

We are using a DRV10983 IC for driving a Maxxon ECX SQUARE 16 L  sensorless brushless BLDC motor, but when we try to run it with all the motor-lock safety checks enabled and a stall condition is introduced, the motor switches off as expected but once the stall torque is removed and the motor switches back on, the motor - driver keeps detecting lock condition and switches off intermittently. Is this normal? how can we avoid this?

  • 0 in reply to Jain James
    TI__Mastermind 26046 points

    Hi Jain,

    Vishnu will get you a reply tomorrow!

    Thanks,
    Aaron

  • 0 in reply to Jain James
    TI__Mastermind 24405 points

    Jain,

    Do you see the motor spinning when you issue speed command of 10? Since all faults are disabled, the device indicates the Abnormal Kt/Speed abnormal faults and continues to commutate. I think the motor might not even be spinning at this speed command and the device incorrectly reads the 20,000 rpm and 500 rpm. Speed command of 10 is 1.9% duty cycle which I think is a very low speed and the device might not be able to estimate sufficient BEMF at this low speed.

    Regards,

    Vishnu. 

  • 0 in reply to Vishnu Balaraj
    Prodigy 60 points

    Vishnu,

    No, you are right. Visibly the motor doesn't spin at this command but at starts to spin only at command of 50. However, at this command motor accelerates to high RPM and then settles at a very low RPM, around 500 and from this point forward any higher command does not make the motor increase its speed but remains spinning at the low RPM.

    Thanks,

    Vishnu

  • 0
    TI__Mastermind 24405 points

    Jain,

    It seems you are asking an additional questions outside of the original scope of this thread. We ask E2E users to use the ask related question button if the original question has been answered. We do this to improve search ability and create a repository of questions that other engineers can find using the TI thinks resolved or resolved fields.

    In the case of this thread, there are now more than 50 replies containing multiple questions that cannot be utilized by the community, as they are unverified and unrelated in most cases. As such, please copy and paste your most recent question about fixing the motor fan speed in a new thread by using the ask new question functionality. 

    Regards,

    Vishnu