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WEBENCH® Tools/DRV8307EVM: DRV8307EVM didn't work when using motor with 3 single hall wires

Murphy Mo
Prodigy 20 points
Part Number: DRV8307EVM
Other Parts Discussed in Thread: DRV8307

Tool/software: WEBENCH® Design Tools

I have a motor with 3 hall sensor wires (single end). I connected all wires to DRV8307EVM board that following User's Guide step by step setup, but the motor didn't work normally when power turned on. The red LED is slowly flash always. The motor is overheat after turn on about 4 minutes. The motor stop run after rotated few seconds, then The motor run after stop few seconds. The motor is the work that is going on and off with red LED slow flashing. Could you tell me how to fix the issue?

  • 0
    TI__Genius 14485 points
    Murphy,

    Are your hall sensors connected in the correct order? Can you probe your oscilloscope to see if your supply rail is stable?
  • 0 in reply to James Lockridge19
    Prodigy 20 points

    1. Using the DRV8307EVM drive motor (BLWR132S-24V-4000), the motor will be very hot in a few minutes. But we use the motor company's EVM board (MDC050-050051 series), the motor has no more temperature.
    2. According to the motor speed, the current of the DRV8307EVM board drive motor is 0.6 - 2.0A, and with a lot of heat, the motor is very hot. The current of the MDC050-050051series board drive motor is 0.15 - 0.45A, and no heat is generated.
    3. We need to have a faster speed. After the same PWM input, the DRV8307EVM can meet our requirements, but MDC050-050051 does not, it only has 1/3 speed. The fly in the ointment is that the former makes the motor very hot. Is there a way to keep the motor not hot?

  • 0 in reply to Murphy Mo
    TI__Genius 14485 points
    Murphy,

    The motor is getting hot because it is not driven correctly. Many times this is an issue with the hall sensor connection. Does the motor seem to spin correctly, or does it have a difficult time spinning?

    Can you double-check the hall sensors to make sure they are in the correct order?

    Can you please double check that you followed the following items from the user guide?

    "When using single-ended Halls, they require pull-ups. The DRV8307 comparator “-” pins should be biased with a middle voltage, so that a single-ended swing on the “+” pin is detected like a differential voltage. Connect the hall outputs to the "+" pins at P3 for normal Hall sensor types or to "-" pins for inverse Hall sensors.

    Jumpers are installed on JP3 and JP4 between pins 2 and 3 (GND).

    Please probe the "-" hall inputs to make sure they have 2-V on them.

    If you have any other issues, please take a scope shot of the hall signals and send it to me.
  • 0 in reply to James Lockridge19
    TI__Genius 14485 points
    Hello Murphy,

    I'm going to mark this post as resolved since I haven't heard back from you. If you have further questions, please post again on this thread or create a new one.

    Thanks!