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Original question:

DRV8307: jitter issue

MCF8316A: Quick start and smooth operation at low speed

kunzhi liu
Prodigy 100 points
Part Number: MCF8316A

I would like to ask if the MCF8316A meets my two needs.

1. Can it run at 90rpm and start up quickly？

2. Is it possible to keep the motor in a certain position, even if the motor is turned, there is a torque to bring it back to this position？

  • 0
    TI__Mastermind 24415 points

    Hi Kunzhi,

    Thanks for checking MCF8316A.

    kunzhi liu said:
    1. Can it run at 90rpm and start up quickly？

    What is the maximum/rated speed of the motor? How many pole pairs?

    kunzhi liu said:
    2. Is it possible to keep the motor in a certain position, even if the motor is turned, there is a torque to bring it back to this position？

    MCF8316A has brake pins which when pulled HIGH applies brakes and stops the motor. Check section 7.3.19 (Motor Stop Options) in the datasheet for more details. 

    Regards,

    Vishnu

  • 0 in reply to Vishnu Balaraj
    Prodigy 100 points

    Hi, Vishnu

    1. The maximum rated speed of the motor is 5840rpm, and the number of pole pairs is 1.

    2. I looked at section 7.3.19.6, does it mean that when the motor is braked, even if the motor is rotated by hand, it will not move or there will be a torque to bring it back to the stopped position.

  • 0 in reply to kunzhi liu
    TI__Mastermind 24415 points

    Kunzhi,

    90 rpm is 1.54% of 5840 rpm which is too low for any sensorless FOC driver. I would still encourage you to check MCF8316A to see if you can drive your motor at 90 rpm. Quick start up is very much possible with MCF8316A. There are several configurable options to start the motor. Please check section 7.3.10.4 (Motor Start-up) for start-up options. 

    When brakes are applied, depending on the brake current and the torque applied by hand, motor may or may not move. If the applied torque is greater than the braking torque, motor will still move. If the applied torque is lesser than the braking torque, motor will not move. Please note that the device does not have the capability to brake the motor at a particular position.

    Regards,

    Vishnu 

  • 0 in reply to Vishnu Balaraj
    TI__Mastermind 26046 points

    Hi Kuhnzi,

    Do you still need help? If not, can we close this thread?

    Thanks,
    Aaron