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Thread: Help choosing a motor

              
   
   
  1. #11
    Senior Member EV_Scoot's Avatar
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    Quote Originally Posted by DrunkenRainbows View Post
    be able to move about 450kg dry. be able to go at least 80mph
    Um, I'm no science geek but the shear physics involved in moving that mass at that speed wouldn't be doable at any kind of sensible feasible budget.
    I've delayed my project because I thought the ME0913 or ME1115 wouldn't be powerful enough to get me any kind of decent acceleration to warrant the price of everything and effort involved.
    Not saying it can't be done.The more weight you're pulling at speed requires more current. More current, more expensive controllers, larger wiring and larger contactors as associated paraphernalia.

    Perhaps you could use dual motor setup. It's up to you. It's only my two cents. Happy to stand corrected if I'm wrong.

  2. #12
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    I understand motors in the way of using as generators but when it comes to what they can move and how fast i'm clueless.
    To be fair something that weight is probably a bit of a stretch considering the space constraints and probably wouldn't have a great distance on it either.
    Thanks for all the suggestions though, I've got them saved with the specs so when the time does come I can look again and see what's around. Maybe i'll start with a smaller scooter first.

  3. #13
    Senior Member Stevo's Avatar
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    Quote Originally Posted by Nicman View Post
    Why not? I have that combo right now and with 17T front and 65T Rear I max at 80mph. 2008 ninja 250r. I'm a big boy at 240 lbs and I think the bike is about 350lbs. been meaning to finally weight it.
    You have to "give" to get. I didn't want to give up too much acceleration and grunt at the bottom end. And I have space constraints on the sprocket sizes that I can use due to chain clearance past the swingarm pivot/frame. No biggie, I've moved on to bigger better badder!

    Quote Originally Posted by DrunkenRainbows View Post
    I understand motors in the way of using as generators but when it comes to what they can move and how fast i'm clueless.
    To be fair something that weight is probably a bit of a stretch considering the space constraints and probably wouldn't have a great distance on it either.
    Thanks for all the suggestions though, I've got them saved with the specs so when the time does come I can look again and see what's around. Maybe i'll start with a smaller scooter first.
    I think most of us were clueless on our first builds... I know that I was. With each build you earn experience, which is priceless (actually quite expensive!) But a good education isn't cheap, Is it?

    Personally, I've been at this for 7+ years and I've seen lots of changes as far as what technology is available for the DIY'er market. Things keep improving at a pretty rapid pace. I don't blame you for wanting to wait for prices to come down, because they will and have. Batteries as well as drive components. This stuff just keeps getting better. But by waiting, your putting off the experience of building. My 2 cents!
    Current rides: '96 Honda Ohlins VFR, '03 Cannondale C440R, '03 Cannondale Cannibal, '06 Yamaha 450 Wolverine 4x4
    Current builds: WORX.VOR.v3.2

  4. #14
    Senior Member Nicman's Avatar
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    Quote Originally Posted by Stevo View Post
    You have to "give" to get. I didn't want to give up too much acceleration and grunt at the bottom end. And I have space constraints on the sprocket sizes that I can use due to chain clearance past the swingarm pivot/frame. No biggie, I've moved on to bigger better badder!
    You sure did. Bike looks great BTW. I looks so slim and lightweight, with a monster motor connected. this thing will be scary.

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  6. #15
    Senior Member Stevo's Avatar
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    Testing should commence relatively soon... scary fast is what I'm hoping for!! Getting the harness finished now and hopefully get the battbox welded up this weekend.
    It is very narrow for now, but the battbox will add girth to it unfortunately. I cant wait for the next gen of batteries to come our way... it will be ALL GOOD!
    Current rides: '96 Honda Ohlins VFR, '03 Cannondale C440R, '03 Cannondale Cannibal, '06 Yamaha 450 Wolverine 4x4
    Current builds: WORX.VOR.v3.2

  7. #16
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    They are still selling these motors? I would have thought things would have evolved a bit on the last 10 years.

  8. #17
    Senior Member Ted Dillard's Avatar
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    ...trying to figure out exactly which motor you're talking about, but I'm going to assume the Motenergy brushed PMDC motors?

    At any rate, yes, stuff has evolved a lot, but these still pack a great punch for the money. I still have my ME1004/AXE7245, and it's a beast.

    ...maybe though you're thinking the AC20 type? Still, a beast for the money.
    Last edited by Ted Dillard; 24 December 2018 at 0504.
    Power in Flux: The History of Electric Motorcycles
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  9. #18
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    I was general in my comment, because I was speaking generally. But every motor model number mentioned was shockingly familiar. I was very much surprised to see the same model numbers being recommended that were 6-7-8 years ago. More shocked that I recognized them and they were still rattling around in this old brain, really.

  10. #19
    Senior Member Ted Dillard's Avatar
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    Ah, gotcha. It isn't so much that stuff hasn't evolved, it's more that the old standards are still around. By any metric, a lot of them are still good choices when you balance the cost, performance, weight, support - all that stuff.

    YASA, Emrax, Remy - they're all still pretty pricey, mounting and support is a little tough if you're a garage builder. Also, the voltage ranges start up in the 350V neighborhood if you want to get the maximum benefit out of the investment - not a comfortable range for your first build by any stretch.

    Besides all that, electric motor tech is remarkably evolved already. In the book, I talk about motor history, and electric motors account for about 40% of all electric energy consumption, and motors have been in development since the early 1900s. We're at a place now where it's just a matter of adaplting what we already know to EV applications.
    Last edited by Ted Dillard; 28 December 2018 at 0641.
    Power in Flux: The History of Electric Motorcycles
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  11. #20
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    Hello All,

    I'm also looking to choose a motor and controller to convert a road bike to Electric
    I'm looking to convert a Yamaha R6 or Honda CBR600
    I want something that is going to perform similar to the original engine
    I've been looking at the Motenergy ME1616 as they are reasonably priced, 144v 250 AMP 77hp Peak
    Another option is the AC20 kit, 96v 650A 50 hp 75 FT/lbs RPM7500 for similar money


    The Kits have very different specifications:

    144v & 250 Amp vrs 96V 650 Amp

    How does this affect overall performance?
    Last edited by Dai; 05 February 2019 at 0331.

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