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LVMultiAxis+PfcKit

Tim11828
Expert 1845 points

Other Parts Discussed in Thread: MOTORWARE, CONTROLSUITE, DRV8301, DRV8312

Hi Chris,

I have started a new thread as you requested.

I am quoting from that thread:

2. InstaSPIN-FOC and -MOTION work very well with ACI motors EXCEPT there is a known issue with the Motor ID of ACI motors, especially with higher current ACI motors.  During ID the current controllers are two stiff and some of the variable scaling is incorrect.  We will be fixing this with a software patch (in user code) in a future release. We are doing some extensive testing across different ACI motors now. This is a similar patch to the one we just made in MotorWare for low inductance BLDC/PMSM Motor ID.  To reiterate, with proper Motor parameters ID'd or known the solution works as expected, it is only the ID of these parameters for certain ACI motors that needs to be fixed.  Your motor is very unlikely to ID properly with the solution that is public.  We have two more MotorWare releases planned for this year and this fix is expected to be ready.

 

Could you post what those changes/issues are the the low inductance motors? I have a very low inductance motor (0.00012H) and am having trouble driving it using LVMultiAxis+PfcKit. The kit runs fine with the supplied motor. I am using the standard SW that came with the kit.

Also, I am not able to bring up graphs. I have tried importing the graph files, and setting the settings manually, but no joy. I was able to do graphs back in CCS v3.3. I am now on CCSv5.1 on my laptop for this particular project.

Thanks.

  • 0
    TI__Mastermind 21320 points

    Tim,

    I relocated your post to the InstaSPIN forum. It will better be able to help others who see it here.

  • 0
    TI__Guru** 119680 points

    MotorWare and instaspin don't work with the kit you mention, so I presume you are just asking in general about lower inductance motors with the SMO project for that kit?

    In general low inductance motors require higher PWM frequencies to overcome the higher short circuit currents of these motors. Your motor isn't particularly low though. By low inductance I mean 10-50uH. 

    These motors also typically require tighter current control than you may be used to. 

    Regarding the graphs this is a common complaint from 3.3 users. There is some loss of functionality but also had to do with setup errors usually. We do have some examples in MotorWare InstaSPIN-MOTION projects you could look at, but it doesn't work with your kit. 

    Look for the graph properties files and see the instructions in the matching project_lab portion of the project lab users guide linked in MotorWare.exe under Resources.

  • 0 in reply to ChrisClearman
    Expert 1845 points

    Hi Chris,

    Yes, you are correct. I am using the low voltage motor kit (TMDS2MTRPFCKIT) that was purchased in 2009. I am able to run the example code that comes with the project. When I try to run BuildLevel2 with our low resistance, low inductance motor, it stalls after almost 180 deg (mechanical, no gears.) There is no load on the motor and I can turn it by hand. I would have thought that since Level2 is still mostly open loop, there should be no issues running that code on a motor other than the one that was supplied. Any ideas?

    As, far as graphing goes, I actually was able to see graphs back when I was using v3.3. I am now using v5.1 but the graphs just doesn't come up. I have looked at the wikipage, examples, including the one you mentioned but still no luck. Anything else I can try? BTW, this is the first time I tried to bring up graphs since upgrading to v5. Do I need the external emulator? I tried connecting to a C2000 emulator, remembering to put a jumper on [M1]J5, but CCS would not connect.

    Thanks.

  • 0 in reply to Tim11828
    TI__Guru** 119680 points

    Regarding the stall, this is very likely from too small PWM frequency for the short circuit current of this motor. You will need to change the PWM higher, I suggest minimum 45 kHz. 

    Unfortunately this is not so easy to do with the way the controlSUITE Based projects are written. It is challenging to increase the PWM without also increasing the sampling and controller rates. If you are skilled you can do it...

    If you are able I highly recommend moving the InstaSPIN solutions using MotorWare. Everything is better and more configurable. 

    Regarding the graphs, I can't help and unfortunately will need to direct you to the Code Composer Studio e2e forum. 

  • 0 in reply to ChrisClearman
    Expert 1845 points

    Hi Chris,

    Can I do InstaSPIN Motion using TMDSCNCD28069MISO and my low voltage kit, or the High Voltage kit (with green PCB)?

    Thanks.

  • 0 in reply to Tim11828
    TI__Guru** 119680 points

    Tim,

    The InstaSPIN-FOC and -MOTION solutions come ready to run only on the DRV8312 (rev D), DRV8301 (rev D), and HVMTR (r1p1) kits.

    You CAN port the software to run on any other inverter, assuming it has the proper currents, voltages, and filtering.  For your green (r5) HVKIT I don't recommend. You can get it to work but there is not a kelvin ground on the currents, there are only 2 shunts, and the filtering would have to be changed.

    I don't recall the HW design for the 2MTR kit, I'd have to go look, but I'm thinking there aren't phase voltage measurements, which is required.

    If you want to do MOTION I recommend the DRV8312-69M-KIT or DRV8301-69M-KIT depending on current range.

    If you are interested in the lower cost F28027F which can only do FOC, we will release a really low cost kit late in October which I would wait for. 6-24V/10A.

     

  • 0 in reply to ChrisClearman
    Expert 1845 points
    Thanks Chris. I look forward to the new kit. Can you say whether it will be under or around the $100 price point?
  • 0 in reply to Tim11828
    TI__Guru** 119680 points

    $17 for isolated controller with debug, $49 for the inverter. 

    InstaSPIN-FOC support through MotorWare. 

  • 0 in reply to ChrisClearman
    Expert 1845 points

    Thanks Chris. Is there something I can subscribe to get an alert when the kit comes out?

  • 0 in reply to Tim11828
    TI__Guru** 119680 points

    Tim,

    do you have a my.ti.com account?  (I suppose you do if you are posting on e2e). You can make sure you have opted in on emails and you should receive any updates regarding motor control, MCU, etc.

     

  • 0 in reply to ChrisClearman
    Expert 1845 points

    Hi Chris,

    Has the new kit come out? I did a quick search on TI's site and did not see anything and haven't seen anything on the newsletters.

    Thanks,

    Tim

  • 0 in reply to Tim11828
    TI__Guru** 119680 points

    it will be announced on Thursday and the tool web pages will start showing soon

    www.ti.com/tool/boostxl-drv8301

    www.ti.com/tool/launchxl-f28027f

     

  • 0 in reply to ChrisClearman
    Expert 1845 points

    Hi Chris,

    Thank you for getting back so quickly to me, and on a non-workday! I see that the Launchpad is already available for purchase, but the BoosterPack has yet to be released. I am looking forward to the announcement and place my order on Thursday!

    Tim

  • 0 in reply to Tim11828
    TI__Guru** 119680 points

    Tim,

    So you are aware, just Monday I used this kit to run a 9uH, 0.0088 V/Hz high speed, medium current motor with 45 KHz PWM.  I had to use Lab 2c and make some changes to the IQ scaling in MotorWare, but once ID'd it ran beautifully, provided full acceleration, and consumed just 50% of the power of the current solution at full speed.

    Needless to say, it got a good reaction at the customer's site. :)

     

  • 0 in reply to ChrisClearman
    Expert 1845 points

    Hi Chris,

    Thanks for sharing, that's certainly good to know. I am very much looking forward to getting my hands on that kit.