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DRV8711: DR8711 Noise and Heat on motor stepper .. need correct parameter .. please help

Vito Zivoli
Prodigy 50 points
Part Number: DRV8711

Hi at all  

For a project where precision and speed are needed, I designed hardware with DRV8711 and MOSFETs equal to those of the EVM-DRV8711 demo board.
  With our MCU ATSAM3X8E I set the calculated parameters with your formulas and sent them via SPI to the driver.
I did several tests but the noise of the engine is a bit high. And I also burned 2 stepper motors for overheating.
I want to avoid it happening again and so I ask you for help from the Forum and technical support.
the stepper motor is Sanyo Denky brand
store2.lipsiasoft.com/.../706172_103-H7823-1740.pdf
bypolar motor, 1.8 ° per step, 4A, Resistance 0.65 ohm, inductance 2.4mH

the power supply is brand Mean Well mod. HRP-600-24
600Watt 24 Vdc

We have to have the highest possible torque at 128 uStep with low noise and temperature ...

I hope in your help

Thank you

  • 0
    TI__Guru** 114905 points
    Hi Vito,

    Would you please provide the register settings that you originally used?

    Also, please provide a schematic of the components around the DRV8711 on your board.
  • 0 in reply to Rick Duncan
    Prodigy 50 points

    stepper driver drv8711_pcb.pdf

    Hi Mr. Rick

     

    Sorry for delay and thank you for fast reply.

     

    This are setting used to control the motor

     

    CNTRL                 (addr 0x00): 0b0000001000101000

     

    TORQUE             (addr 0x01): 0b0000000101111000

     

    OFFreg                (addr 0x02): 0b0000000000001010

     

    TBLANK              (addr 0x03): 0b0000000000001010

     

    DECAY                (addr 0x04): 0b0000001000110010

     

    STALL                  (addr 0x05): 0b0000101110000000

     

    DRIVE                  (addr 0x06): 0b0000000011110000

     

    The driver board is a module that plugs into our main board.

    This card works well enough because the routing is very nice in terms of currents, shielding, signal integrity  and ground ..

    The circuit is developed on 4 layers FR4.

     

    I hope  in your help..

     

    Thank you in advance..

  • 0 in reply to Vito Zivoli
    TI__Guru** 114905 points
    Hi Vito,

    Please use the datasheet recommended capacitors on VINT (1uF) and V5 (0.1uF).

    If you are trying to maximize the torque, please use Auto Mixed decay (DECMOD 101), enable adaptive blanking (ABT = 1), and set the off register to 0x027 (~20us off time). Using 20us off time should set the PWM frequency to less than 50kHz.

    It is recommended to monitor the current to ensure the current waveform is as expected.