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DRV8834: About constant voltage drive type motor

Tsukui Yusuke
Guru 21930 points
Part Number: DRV8834
Other Parts Discussed in Thread: DRV8846

Hi,

Could you tell me about drive constant voltage motor by DRV8834?
Customer wants to drive the following motor with DRV8834.

・SMC10-20
https://www.eminebea.com/jp/product/rotary/steppingmotor/pm/small/smc10-20.shtml

Can DRV8834 drive this motor?
And Could you tell me the recommended circuit connection method?

Best Regards,
Yusuke

  • 0
    TI__Guru** 114905 points
    Hi Yusuke-san,

    Yes the DRV8834 can drive this motor.

    What do you mean by constant voltage?
    Does the customer want the outputs to be driven:
    1) Using full step (2-phase excitation)
    2) Using no current control

    For the operation above, set the DRV8834:
    1) VM to 5V
    2) the CONFIG to a logic high
    3) M1/M0 to a logic low.
  • 0 in reply to Rick Duncan
    Guru 21930 points

    Rick-san,

    Thank you for your response and support.

    〉What do you mean by constant voltage?
    Please excuse my lack of explanation.
    I pointed to the drive circuit and described as constant voltage.



    〉For the operation above, set the DRV8834:
    〉1) VM to 5V
    〉2) the CONFIG to a logic high
    〉3) M1/M0 to a logic low.

    I have a question about your comment.
    1)About ISEN pin
       Should the ISEN pin be connected to GND?

    2)Please tell me more about the way to drive bipolar const volt motor
       Because SMC10-20 is not current control,
       Customer is worried about overcurrent.

    Best Regards,
    Yusuke

  • 0 in reply to Tsukui Yusuke
    TI__Guru** 114905 points
    Hi Yusuke-san,

    I have a question about your comment.
    1)About ISEN pin
    Should the ISEN pin be connected to GND?

    >>> For constant voltage, xISEN pins can be connected directly to GND. For current control, xISEN pins should be connected to resistors to GND.

    2)Please tell me more about the way to drive bipolar const volt motor
    Because SMC10-20 is not current control,
    Customer is worried about overcurrent.

    >>>>> See below

    Stepper motors can be driven by a constant voltage or by controlling the current to simulate a constant voltage

    Stepper motors are typically rated at a low DC voltage, but can be driven at much higher voltages. Operating at higher voltages provided the benefit of higher motor speeds.

    The key is to control the current so that the current through the windings is no more than the rated current.

    If constant voltage is desired, use the following configuration:
    VM = 5V
    CONFIG = Logic high
    M1/M0 = Logic low
    AVREF/BVREF = VREFO
    xISEN connected to GND (no current regulation required)


    If current control is desired, use the following configuration:
    VM > 5V
    CONFIG = Logic high
    M1/M0 = Logic low
    AVREF/BVREF = VREFO
    xISEN connected to sense resistors to control the current.

    If current control is desired, the DRV8846 operating at 12V may be a better fit.