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TIDEP-01032: Which Motor to use?

Friedrich Janus
Prodigy 70 points
Part Number: TIDEP-01032

Hi there!

Re documentation says that a "BLY342D-48V-3200" from Anaheim shall be used for the TIDEP-01032.

This is a 48V motor but the Booster pack AM2BLDCSERVO is rated only at 24V.

Can a 24V motor be used also?

Which are the key values for a different motor to be used for the TIDEP-01032? Anaheim is a little far fetched from Europe :)

rgds

  • 0
    TI__Guru 54905 points

    Hi Friedrich,

    You are correct. The BLY342D-48V-3200 is 48V motor and AM2BLDCSERVO is rated only at 24V, but we can still use the AM2BLDCSERVO to drive BLY342D-48V-3200 if we limit the motor to low speed. We have not tried 24V motor yet.

    Best regards,

    Ming 

  • 0 in reply to Ming Wei
    Prodigy 70 points

    Good Morning Ming,

    in order to choose a good motor can you please specify criteria to choose one.

    E.g. pole pairs, rated current, star/delta configuration, maximum rpm, ...

    Otherwise we would have to guess ...

    With kind regards

  • 0 in reply to Friedrich Janus
    TI__Guru 54905 points

    Hi Friedrich,

    Before we integrate the universal motor calibration into the reference design code, the only motor we currently support is the BLY342D-48V-3200.

    Best regards,

    Ming

  • 0 in reply to Ming Wei
    Prodigy 70 points

    Hello Ming,

    and when ist the "universal motor calibration" due to be integrated?

  • 0 in reply to Friedrich Janus
    TI__Guru 54905 points

    Hi Friedrich,

    It is under development. I do not have the release schedule for that.

    Best regards,

    Ming 

  • 0
    TI__Expert 3370 points

    Hello Friedrich,

    The current release of TIDEP-01032 is compatible with the BLY342D-48V-3200 motor. However, you have the flexibility to drive any motor that falls within the voltage and current limits of the AM2BLDCSERVO Booster Pack. To do so, you’ll need to adjust the current loop and speed loop PI parameters based on the specific characteristics of the new motor, including Ld, Lq, Rs, inertia, and pole count. Additionally, perform an initial position detection test and establish the offset between the motor and encoder. Keep in mind that fine-tuning the initial position reading method in TIDEP-01032 may be necessary for certain motor types.

  • 0 in reply to Masoud Farhadi
    Prodigy 70 points

    Hello Masoud,

    thank You for your reply. This will help a little. The question is, where to find these parameters? Are they layed out in a header file together or do I have to search for them? So I have to look for:

    Ld, Lq, Rs, inertia, pole count in the source files

    Voltage and current limit in comparison to the old motor in the data sheets

    Current and spped loop PI regulator parameters in the source files

    Correct?

  • 0 in reply to Friedrich Janus
    TI__Expert 3370 points

    Hello Friedrich,

    I checked the code, and these specific parameters are not stored in a single user settings file. Therefore, you’ll need to locate these parameters within the project and make adjustments to migrate to the new motor.
    You can find the values for Ld, Lq, and Rs in the current PI controllers. Motor inertia is used in speed loop PI controller within a common FOC. Additionally, don’t forget to update the offset between the motor and encoder by performing an initial position detection test.

  • 0 in reply to Ming Wei
    Prodigy 70 points

    Hello all together

    I suggest to update the documentation TIDEP-01032 with the information where to find the relevant places to change for a different motor and how to change.

    With kind regards.