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DRV10983Q1EVM: Parameters about restart

Chase Jeong
Mastermind 7505 points
Part Number: DRV10983Q1EVM
Other Parts Discussed in Thread: DRV10983

Tool/software:

Dear TI experts,

My customer is looking for parameters about restart, but I cannot find it in GUI.

The problem is, if customer stops spinning the motor by his hand, the motor spins at low speed.

(Customer expected that spinning at same speed after stop by hand.)

Could you check that this is normal operation? and also check the parameters about restart in GUI.

I attach the video clip about stopping motor assembly which my customer did.

Please check this issue. Thanks.

Best regards,

Chase

  • 0
    TI__Mastermind 23572 points

    Hi Chase, 

    Can you try to check current consumed before and after trying to stall the rotor?

    Kt may not be proper, Can you measure the Kt as mentioned in the Tuning guide?

    There is no reset , you need to Power cycle .

    Thanks and Best Regards 

    Venkatadri S 

  • 0 in reply to Venkatadri Shantaram84961
    Mastermind 7505 points

    Dear Venkaradri,

    Thank you for your support.

    Here are the answers from my customer ;

    Can you try to check current consumed before and after trying to stall the rotor?

    -> Before Stall the rotor : 0.23A

    After Stall the rotor : 0.71A

    Kt may not be proper, Can you measure the Kt as mentioned in the Tuning guide?

    -> Kt (mV/Hz) : 7.8~8.3 (Measured by DRV10983Q1 EVM GUI, Motor Speed : 9,500RPM (950Hz))

    (input voltage of motor : DC 7.4V, PWM : Duty 99%, switching frequency 1kHz)

    Please check this issue. Thanks.

    Best regards,

    Chase

  • 0 in reply to Chase Jeong
    Mastermind 7505 points

    Dear Venkaradri,

    Thank you for your support.

    Please let me know if there are any updates about the issue above. Thanks.

    Best regards,

    Chase

  • 0 in reply to Chase Jeong
    TI__Mastermind 23572 points

    Hi Chase,

    Thanks for reminding. From the display window Kt is proper.

    This is a voltage mode controller and as long as there is no loss of sync device continues to apply commanded duty.

    In this case duty may have increased to 100% and but load has changed the speed.

    After load is released and duty continues to keep 99% but motor do not pick up, does that mean problem at motor?

    When we reduce duty say to 50% and increase again what happens?

    Can you also share the configuration file.

    Thanks and Best Regards 

    Venkatadri S