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  1. #1
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    Keyde motors and batteries + motor 'revolution'

    Quite new to this area and am looking for any info, particularly reliability on this brand of very small (font wheel in this case) motor made by the Zhejiang Chaoji Electric Technology. I rode one and it seems to fit my needs. but I would like to know if anyone has any comments re - well anything. They also make a small and v. cute 33v 6.3ah battery looks just like a drink bottle. The motor is a 33v 250w. I am also trying to find information about the term 'revolutions' as applied to these geared motors. I realise that the smaller the number the more torque, the higher them more top end speed. I am looking for a conversion that will help me with a couple of hills on my regular route, but is it that simple? the lower/torqu=ier the better? they have quite a few options -160/170/185/200/215/235/260, is there a lot of difference between these?
    Thanks
    Perry

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    Senior Member chas58's Avatar
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    I posted some good information here:
    http://www.bikeforums.net/showthread...-(RPM-amp-mph)

    take a look at the chart. Choose your speed and distance and it will give you an idea of the motor type and battery you need to start with.

  3. #3
    Senior Member chas58's Avatar
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    They all have the same torque. Changing the RPM doesn't change the torque, it just changes the motor's efficiency range and top speed. If you get out of the efficiency range, something will overheat. Generally the speed of the motor is designed for specific wheel size (assuming you don't change the voltage).

  4. #4
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    Thanks Chas, I had looked at this chart before i posted, but my inexperience perhaps with terminology? or just the whole area means i dont really understand it. If i may change the question slightly, what does this term 'revolution' mean and why do manufacturers give choices?

  5. #5
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    Quote Originally Posted by perrycas View Post
    Thanks Chas, I had looked at this chart before i posted, but my inexperience perhaps with terminology? or just the whole area means i dont really understand it. If i may change the question slightly, what does this term 'revolution' mean and why do manufacturers give choices?
    The term "revolution/revolutionary" used in advertising usually means bupkis in my opinion...
    He uses statistics as a drunken man uses lamp-posts...for support rather than illumination. I do like my beer, so sometimes I do end up leaning on the lamp-post...

  6. #6
    Senior Member chas58's Avatar
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    Building a Kit, I would stick with something new and proven. Some motors turn out to be junk after a couple of months use. Off the top of my head, Cute (Q100), Bafang, MAC, BMC, eZee are pretty reliable geared motors.
    Basically when choosing the Motor RPM, you just match it with the wheel and battery voltage. The vendor should have a kit or recommendation for you. Roughly speaking a 250watt 36v motor on a 26” wheel would be around 230rpm, while on a 20” wheel it may be closer to 280rpm. Those are very rough numbers though, whomever sells you the motor should know what works best for your wheel size.

    With that said, the 235 rpm motor would work best on most 26” (or 700c) bikes, but even so that motor will not give you much help above 15mph, and no help above 18mph.

    There is a strong argument for only using a front motor on a steel fork and the alloy forks are prone to breaking with a motor and breaking a front fork makes an ugly and painful crash. I have never heard of a front fork breaking with a small 250watt hub motor, but anything bigger definitely requires steel and a torque arm.

  7. #7
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    Since reliability is important to you
    No way you can tell relability unless you actually see such motor which has worked on bike for at least 10,000km
    Chances are next to none that you can find it
    As you can see on this forum there is one system which has been in use close to 15,000km
    This is not a simulated use but real life

  8. #8
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    thank you thats helpful. I might say that my concerns are help with hills and not a top speed, so I am still a little unclear as to why this manufacturer gives a range of choices.
    and Powell what is this system that you allude to?

  9. #9
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    EPLUS of course USA-made and designed by US company.
    No more in production but with active service for sure available on Crag lists .
    Search E+ or Eplus very long thread BY owner Metalman below on the same page
    Last edited by powell; 04-25-13 at 09:15 PM.

  10. #10
    Senior Member chas58's Avatar
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    Quote Originally Posted by perrycas View Post
    thank you thats helpful. I might say that my concerns are help with hills and not a top speed, so I am still a little unclear as to why this manufacturer gives a range of choices.
    and Powell what is this system that you allude to?
    It is confusing, and that is too many choices - geeze, every 20 rpm.

    If you are running a 26" (or 700c) wheel at 36v and riding less than 15mph, the 200 rpm will work well. Still, a tiny 250watt motor with a small 14amp controller isn't going to give you a lot of help, but it is rather like a second set of lets powering the bike.

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