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Sinusoidal BLDC

Harvey Wang
Intellectual 340 points

Other Parts Discussed in Thread: CONTROLSUITE

Just a quick check, will a Sinusoidal BLDC control application be planned to add into controlsuite release?

  • 0
    TI__Intellectual 930 points

    It is already added into control suite. Please check the low voltage (dual-axis) motor control code.

     

    Regards

  • 0 in reply to Bill13027
    Intellectual 340 points

    Thanks Bill!  However I am referring to a SPWM driving mode instead of SVPWM.

  • 0 in reply to Harvey Wang
    Genius 5170 points

    SVPWM offers multiple advantages over traditional SPWM ... unless there are specific reasons to have SPWM, system will have better performance and lower loss with SVPWM .. .would you please share your reasons to look for SPWM?

  • 0 in reply to Arefeen
    Intellectual 340 points

    Arefeen,

    Trying to run a sensored BLDC(3 halls) with 4-quadrant operation. The example application of 'HVBLDC_Sensored' released in ContrilSuite is not able to work in  II and IV quadrants .  I learned that complementary  Sinusoidal PWM switching technique is capable of handling such case....

    SVPWM is definitely a good choice to apply to 4-quadrant operation too, it seems still need some works to revise the 'HVPM_Sensored' or 'HVPM_Sensorless'  codes to suit a 3-hall BLDC.

    Thanks!

  • 0 in reply to Harvey Wang
    Genius 5170 points

    So, are you planning to operate the drive in quadrant 2 & 4 continously ? if so, you will also need to modify the hardware to handle "regeneration" operation and that will also take some extra software in addition to your motor control code. You are correct, the regular motor control example provided will not handle all qaudrants without additional code which is more than just PWM generation technique. By the way, if you can share, I am interetsed to know more about your 4 quadrant capable hardware design.

  • 0 in reply to Arefeen
    Intellectual 995 points

    Hi!

    Will You please explain what You mean saying

    Arefeen Mohammed said:
    the regular motor control example provided will not handle all qaudrants without additional code which is more than just PWM generation technique

    And what quadrants do You mean? XY-plain second and fourth quadrants?

    I'm just starting with Motor Control, if any.

    Thank You in advance.

  • 0 in reply to Lucifer Angel
    Genius 5170 points

    Over the years I have seen various ways to define these quadrants but  in most common one the speed is in x-axis and the torque is in y-axis as shown below .  In Quadrants 1 &3 the drive produces torque in the direction of motion, and in quadrants 2 and 4 the torque is produced in the opposite direction of the motion. In quadrants 1 and 3 energy flows from electrical system to mechanical system. In quadrants 2 and 4, the drive acts as a generator. The rotation of the system is converted into electrical power, which is then absorbed by the drive or has to be fed back to the line.  Therefore the controller has to implement algorithms so that the generated energy in quadrant 2 & 4 is either burned using a braking resistor or fed back to the line (regeneration) to minimize energy waste. One common application of regeneration is battery charging in hybrid vehicle. It goes without saying all these features will require additional code in addition to motor control implementation.