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DRV8323R: F280025PNS + DRV8323RHRGZR : Custom board : What's ideal waveform ?

Danny Chan
Intellectual 590 points
Part Number: DRV8323R
Other Parts Discussed in Thread: LAUNCHXL-F280025C

Tool/software:

Hi，

I have custom board which's ~100% launchxl-f280025c + boostxl-drv8323rh combo replicate, I would like to know what's the ideal waveform ? since I don't have CURRENT PROBE for oscilloscope therefore I would like to know if anyway can tell my board performance !

Below is Graph feature of CCS, how can I generate or capture without other tools ? 

Lab Guide Phase Current waveform example 

 

below is waveform measured on VENSE_A and ISENS_A pins 

motorVars_M1.flagEnableSpeedCtrl = 0, torque mode 

motorVars_M1.IsSet_A = 0.8A, motorVars_M1.speed_Hz = 112Hz

motorVars_M1.flagEnableSpeedCtrl = 0, torque mode 

motorVars_M1.IsSet_A = 2A, motorVars_M1.speed_Hz = 170Hz

  • 0
    TI__Genius 11076 points

    Apologies for the delay in response,

    Addressing each of your questions in order.

    1. For ideal waveform, the Universal Motor Control Lab User's Guide has example waveforms for current and voltage in section 3.5.
    2. For determining performance, note that the current is calculated in the UMCL. This can be viewed in the CCS expressions window.
    3. The UMCL graphing functionality is enabled by the DMA peripheral, and can be utilized in CCS via the instructions in section 3.4.1.

    Regards,
    Jason Osborn

  • 0 in reply to Jason Osborn
    Intellectual 590 points

    Hi Jason,

    Thanks for your response, can you help to explain 

    Jason Osborn said:
    For ideal waveform, the Universal Motor Control Lab User's Guide has example waveforms for current and voltage in section 3.5.

    where's section 3.5 in MCLU ? 

    below is motorVars_M1.adcData.I_A.value[0] data based on DMC_LEVEL_2

    1. motorVars_M1.speed_Hz = 100 Hz

    2. if motorVars_M1.speed_Hz = 200 Hz. waveform look like this, don't think it's distortion but what's about ? 

    and where can I get more information about FOC waveform ? 

    Danny

  • 0 in reply to Danny Chan
    TI__Genius 11076 points

    Danny,

    This is the link to the Universal Motor Control Lab User's Guide. Refer to the Table of Contents for specific section locations.

    For the question regarding the current waveform you posted, I need a bit more information.

    1. Is the motor moving while the waveform looks like that?
    2. Does the current waveform on the oscilloscope match this waveform?

    For general information on FOC control, the UMCL user's guide section 2 goes over the theory behind FOC. I don't recall offhand if Texas Instruments has any specific resources on the basics other than documents like the UMCL User's Guide, but FOC is a well-known operation, and numerous online resources can be found which cover basics.

    Regards,
    Jason Osborn