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Hercules RM4x controlCARD on DRV8312 kit, with sensorless FOC?

Jared Allen
Intellectual 450 points

Other Parts Discussed in Thread: MOTORWARE, DRV8312, CONTROLSUITE

I was wondering if there is a reason why the sensorless FOC project is not included in MotorWare projects for the Hercules.  Are there anticipated problems with this?  I was thinking I'd try the RM46 Hercules Safety MCU controlCARD on my DRV8312 board that I've been using with the Piccolo 2803x controlCARD to control my sensorless motor (eventually using the RM46 and DRV8312 ICs in a medical application).  If anyone can provide some assistance with this, I'd greatly appreciate it.  Thanks.

  • 0
    TI__Genius 13810 points

    The motorware project includes both sensor and sensorless FOC, the switch point is at: BaseRPM (3450)*0.25=860 rpm. Below this speed, encoder feedback, beyond this speed, sensorless FOC.

    Regards,

    Haixiao

  • 0 in reply to Haixiao Weng
    Intellectual 450 points

    I appreciate the rapid response.  My application does not permit the use of any sensors, so it looks like I would not be able to get my motor to the switch point.  Is this true?  Or is there a way to use this project without an encoder for startup?

    Thanks again.

  • 0 in reply to Jared Allen
    TI__Genius 13810 points

    As you may know, the sensorless feedback does not work well at low speed. In the controlsuite, for the c2000 MCUs, they started with open loop, once the motor reachs to a certain speed, it closes the loop (sensorless).

    In our case, we use the sensor feedback to get to this speed. If you like, you can use the open loop to get to a certain speed too. (Actually the motorware code start with open loop, once it finds a index signal, it goes to QEP feedback, once it reaches the switch speed point, it goes to sensorless feedback)

    Regards,

    Haixiao