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Thread: 300A VESC in the works, feature suggestions wanted

  1. #1
    TechAUmNu's Avatar
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    I am starting work on designing a 300A VESC.

    So far I have chosen to use Direct-FETs and associated discrete gate drivers
    FETs: IRF7769L2TRPBF
    Gate Drivers: 1EDI60N12AF

    The first version will have:
    • 4 Fets per phase leg (24 total)
    • 2 Gate drivers per phase leg (12 total)
    • CNC machined aluminium heatsink with NO fan
    • STM32f405 Cortex M4F
    • Nichicon PW(M) capacitors
    • 18s LiPo maximum
    • 300A continuous
    • 1200A peak
    • Axial connectors (Everything inline to make them stackable)
    • All standard VESC features (CAN, SPI, Encoder/Hall support)
    • Lots of free space around mounting points for shock mounts


    Is there any special features that would be particularly useful to roboteers?
    Last edited by TechAUmNu; Yesterday at 22:16.

  2. #2
    typhoon_driver's Avatar
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    Features - cost less than a tenner. You'll be very popular

  3. #3
    overkill's Avatar
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    A potted case is a REALLY bad idea! I tried that on a number of IFI Victors a few years ago and they all eventually died. It was traced back to the potting resin expanding at a different rate to the PCB and causing solder joints to crack. A thin conformal coating is a better bet. Room to add our own shock mounts is a good idea.

  4. #4
    TechAUmNu's Avatar
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    Quote Originally Posted by overkill View Post
    A potted case is a REALLY bad idea! I tried that on a number of IFI Victors a few years ago and they all eventually died. It was traced back to the potting resin expanding at a different rate to the PCB and causing solder joints to crack. A thin conformal coating is a better bet. Room to add our own shock mounts is a good idea.
    Good to know! Its probably best to not have any coating then to make it easier to replace parts.

    As for pricing I don't want it to be over £300 current BOM is ~£120 + board.

  5. #5
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    There's a couple of us trying to build 300A ESCs now.

    Personally I'm not a fan of directFETs, can't inspect joints, package is unique to Infineon and they seem to discontinue them quickly. HSOF packages seem much better to me, it's what they use in the Vex BB controllers.

  6. #6
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    Not sure on the integrated shock mounts. Prefer some flexibility on mounting e.g. mount into a shock mounted electronics box

    I'm looking to drive 8019 Neumotors - http://neumotors.com/80xx-series-electric-motors/

  7. #7
    TechAUmNu's Avatar
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    Quote Originally Posted by shakesc View Post
    Not sure on the integrated shock mounts. Prefer some flexibility on mounting e.g. mount into a shock mounted electronics box

    I'm looking to drive 8019 Neumotors - http://neumotors.com/80xx-series-electric-motors/
    I will make the mounting points on the board with plenty of room around them instead, then it gives people mounting flexibility.

    So about 350A peak on those motors, I might end up making another board with 6 or 8 fets per phase if there is demand. It really bumps the price up though.

  8. #8
    TechAUmNu's Avatar
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    Quote Originally Posted by Pinski1 View Post
    There's a couple of us trying to build 300A ESCs now.

    Personally I'm not a fan of directFETs, can't inspect joints, package is unique to Infineon and they seem to discontinue them quickly. HSOF packages seem much better to me, it's what they use in the Vex BB controllers.
    I was thinking that too, only real reason I was going with them was for the ability to stick a heatsink directly onto them, but looking at the HSOF I am going to use this one instead.
    http://www.mouser.com/ds/2/196/Infin...-en-767648.pdf
    Has almost half the on resistance and bumps the current rating way up for a very small price increase.

    Thanks!

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