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LP-AM263P: Motor Control Parameter Calculation - LPF cut off frequency

Burak Yeniaydin
Prodigy 220 points
Part Number: LP-AM263P

Tool/software:

Hello,

I’m working on a motor control setup using the LP-AM263P LaunchPad along with a custom motor driver board. I’m adapting the example code from the Motor Control SDK to fit my hardware.

While reviewing the "Universal Motor Control Reference Design for AM263x Arm® Based MCU Devices" document, specifically section 4.6 – Building a Custom Board, I noticed that some parameters need to be customized based on the hardware used. One of those parameters is:

USER_M1_VOLTAGE_FILTER_POLE_Hz

As I understand it, this represents the cutoff frequency of the low-pass filter (LPF) used in the voltage sensing circuit. The "Motor_Control_Parameter_Calculation.xlsx" file from the "universal motor control" example shows how this value is calculated for various driver boards.

In my case, there is no LPF in the voltage sensing circuit on my custom motor driver board as following image. Given that, how should I define the USER_M1_VOLTAGE_FILTER_POLE_Hz value?


Regards,
Burak

  • 0
    TI__Expert 3630 points

    Hello Burak,

    This is mostly for voltage measurement for DC bus voltage. For phase voltage, we mainly use it for the FAST observer, but, that’s not available for AM2x devices at this time. You can find the "Motor_Control_Parameters_Calculation.xlsx" file in the "doc" folder of the project, which will assist you in calculating the filter pole hertz.

    Best Regards,

    Masoud