TMS320F28379D: Field weekening implementation in dual axis drive

Hello,

Due to US holiday, please expect a response by 20th February.

Thanks & Regards,

Sinchita

Thanks yanming i will have a look and get back to you for any clarifications

Hi Yanming, i had a look at the universal lab project and made a very basic field weakening controller, which i plan to add it to the speed loop.

Could you have a look at it and let me know if i'm on the right track..

float32_t runFWC(float32_t mechTheta, float32_t speedRef)
{
    //speedRef is the normalized speed reference.
    //mechTheta is the normalized mechanical angle got from the encoder.

    float32_t idRef = 0.0f;
    float32_t angle_rad = 2 * PI * mechTheta;
    float32_t cos_theta = __cospuf32(angle_rad);
    float32_t sin_theta = __sinpuf32(angle_rad);

    if (fabs(speedRef) > 1.0f) // Apply field weakening only if the speed reference is greater than base speed
    {
        // Field Weakening Control Logic
        // Adjust idRef based on mechTheta and speedRef
        if (speedRef > 0.0f)
        {
            // Clockwise rotation
            idRef = -speedRef * cos_theta; // Adjust idRef based on speedRef and cosine of angle
        }
        else if (speedRef < 0.0f)
        {
            // Anti-clockwise rotation
            idRef = -speedRef * sin_theta; // Adjust idRef based on speedRef and sine of angle
        }
    }

    return idRef;
}

Not correct. This angle is not the electrical or mechanical angle of the rotor, it's the current vector angle.

Thanks for the clarification , How is the current vector calculated?, Correct me if i'm wrong but is this how we calculate the current vector angle:

1. Run the clarke (a,b, c to I-alpha. I-beta)

2.Run the park transformations using I-alpha. I-beta and rotor angle to get Id and Iq.

3. Calculating atan() if id and iq give the vector angle?

I was looking at the dual axis  FOC block diagram: What is OmegaR (Wr) ? is this the speed feedback? I notice the same is going into the field weakening block. So the inputs for the wield weakening block are the speed reference and speed feedback and the output is the Id current. I am trying to establish a basic skeliton of the fieldweakening function.