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Original question:

MCF8329EVM: MPET parameters

MCF8329EVM: MPET does not work

Mathias Fernengel
Prodigy 20 points
Part Number: MCF8329EVM
Other Parts Discussed in Thread: MCF8329A

Hello,

I try to execute MPET as well with no result.

I'm running Motor Studio Version 0.1.15

This is a part of my log:

11:50:11:666 | :Beginning Motor Ke measurement...(Your motor will spin up slowly during this time)

11:50:10:555 | : Running MPET...

11:50:1:651 | :Beginning Motor Ke measurement...(Your motor will spin up slowly during this time)

11:50:1:462 | : Could not detect any MPET fault. Please check the tuning file..

11:49:39:471 | :Beginning Motor Ke measurement...(Your motor will spin up slowly during this time)

11:49:37:805 | : Could not detect any MPET fault. Please check the tuning file..

11:49:17:140 | :Beginning Motor Ke measurement...(Your motor will spin up slowly during this time)

11:49:15:413 | : Could not detect any MPET fault. Please check the tuning file..

The Video mentioned here is not available any moreDisappointed 

"  in reply to Akshay Rajeev Menon
TI__Expert 7335 points

Hi Marc,

I made a getting started video for the MCF8329EVM:

tidrive.ext.ti.com/.../b75beb95-f9d9-44be-b770-9f14865dcd03

Access code: -a7ytcX2

Please let me know if you are able to move past the MPET step following the video. If MPET still has issue completing successfully, then we might have to try hand measuring the motor parameters and entering them manually. Please refer to this E2E FAQ. I believe both Wye wound and Delta wound motors can be measured in the same way.

Regards,
Eric C.  "

Best regards, Mathias

  • 0
    TI__Expert 5550 points

    Hi Mathias,

    MCF8329A default set of registers should have proper R, L value of the motor. Before starting the MPET run please populate the R, L value of the motor to the location as shown below

    Also, if motor is low power (higher R ) then also MPET may not run successfully. We have to set BASE Current through GD_CONFIG2 (Base current) and GD_CONFIG1 (CSA Gain) appropriately. 

    Can you provide the motor parameter details if you have it.

    Let us you do not have, then follow below mentioned steps as example  

    1. CSA has four level of Gain selection 5V/V, 10V/V, 20V/V, 40V/V
    2. BASE CURRENT is 15-bit value which is calculated based on gain settings It is given by {1.5/(RSHUNT*CSA_GAIN)} Scaling: 32768 / 1200 Example: for 15A, enter 15 * 32768 / 1200
    3. Base Current will be 7.5A for CSA Gain pf 40V / V with R Sense Shunt of 10mOhm or 3.75A for CSA Gain of 40V/V . For 7.5A write 0xCC to GD_CONFIG2-> BASE_CURRENT

    Thanks and Best Regards,

    Venkatadri S

  • 0
    Prodigy 20 points

    Hello Venkatardi,

    Our motor parameters are: R_LL=53mOhm, L_LL=58µH, Ke=13,89mVs/rad.

    The supply voltage is 13,5V, and the motor line current is around 20A rms

  • 0 in reply to Mathias Fernengel
    Prodigy 20 points

    Can you provide the needed parameters for this configuration?

    Is there any manual for motor studion available

    Best regards, 

    Mathias

  • 0 in reply to Mathias Fernengel
    TI__Expert 5550 points

    Hi Mathias,

    I will try to set suitable configuration and send you by this weekend.

    Thanks and Best Regards,

    Venkatadri S