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#31099
some may know that my 900 watt beast motor blew up on a hill, pulling my rig with me walking besides it. tsk tsk. these currie motors are not ventilated, and are poor candidates for cooling solutions, given my power/weight/size requirements.

living in so cal, it's hot all the time, and i prefer to have a motor that is ventilated open with a fan for optimal cooling. worry about dirt/debris entering the motor is second. i've been doing a lot of research, and there aren't very many options for a high powered motor with a 10mm shaft, to directly mount the original currie sprocket on. so, i'm looking at motors with a bigger shaft, with an eye to put in a reducing method, using jaw coupling/spider assemblies, to fit my #25 chain setup/investment, if i cannot find a 7/8ID sprocket, made for #25 chain. comments/referrals invited.
#31203
the yk43b, yes, the same. my theory is this, regarding power: if you have more than too much, then when you don't need it all, it's plenty. right, the high draw is just mainly starting off, then once up to speed, barely have to tweak the throttle just to keep moving. the other is, i'm gearing up. stock was, let's see, 90 tooth drive sprocket, driven by a 11 tooth stock currie sprocket. the smallest sprocket i could find was this one that fit the 7/8 shaft referenced in the line drawing for the motor, from mcmaster-carr ( https://www.mcmaster.com/#roller-chain- ... s/=18dee65 ) and the transmission will have 14 teeth on both sides, , for 1:1, so really it's geared up to 20:90 at its simplest. yes. more speed, but still have plenty of power, on my un-small-car scooter. hee..
#31205
20-90 ratio should be ideal , gain some top speed, and the motor will never get warm no matter what kinda hills u climb,. much like an industrial build except the motor u bought is actually capable of more power than most industrials.
#31207
i think they screwed up their website-- i look at the page for the motor, and click on add to cart. now i have an invoice for a BRUSH HOLDER for the motor for 99 dollars? I thought i was buying the MOTOR for 99 dollars. dang it.
#31223
so, as voltage goes up, the amperage draw of the relevant motor goes down. theoretically, the same batteries i have would give a longer run time at a higher voltage configuration, no? my current stock of batteries are 6 of the 12 volt, 12 amp-hour rating, lead-acid. i was using them in a 3 bank 24 volt config, for 36 amp-hours. i could also wire them as 36 volts, with 2 banks, for 24 amp hours. or even 72 volts at one bank, for 12 amp hours.
#31224
The motor will accept whatever amperage the controller puts to it. Now if you are light on the throttle it will last longer. If a motor is rated 30a than that's what it can handle safely but it will draw as many amps as it can up to its rated rpm or overvolted rpm. Then draw more amps based on load and controller capability. Higher ah is better but I wouldn't use below 36v. I am changing a mx500 to 48v because the motor and controller I want to try is only available in 48v.
#31225
david coffin wrote:so, as voltage goes up, the amperage draw of the relevant motor goes down. theoretically, the same batteries i have would give a longer run time at a higher voltage configuration, no? my current stock of batteries are 6 of the 12 volt, 12 amp-hour rating, lead-acid. i was using them in a 3 bank 24 volt config, for 36 amp-hours. i could also wire them as 36 volts, with 2 banks, for 24 amp hours. or even 72 volts at one bank, for 12 amp hours.


NOOO// the controller regulates the amperage, as laundry said above.. you are still better off in most cases with a lower voltage system , because you simply have to carry less batteries for the same AH//
example / 6 batteries in parallell is 12v 72 ah ( 12 ah batteries for this example )
running a 30 amp comtroller and a 12 v motor , ur run time will be insane
now , take the same 6 batteries, and run series , u now have 72 v 12 ah
your run time will normal , 12ah supply..
NOW the advantage to the 72 v system is that you are running 72 volts times 30 amps or 2100 watts
on the 12v system you are running 12v times 30 amps or 360 watts..
BUT YOUR NOT RUNNING 30 AMPS , you are running 200 amps
so 200 amps times 24v = 4800 watts , alot of power in a small scooter
were you to run a 72v motor , 72 volts at 200 amps you are now running 14,400 watts//
SO it all balances out , Until you decide to over volt the motor/. Because controllers for scooters are widely limited to 60 volts, its simply less effieicent to carry extra batteries to overvolt at a higher voltage.Ive tested it all , NO ONE in the history of this forum has build a powerhouse at higher voltage , the fastest karts and scooters were always below 48v .. this also ties into rpm per volt , or KV as they call it in rc motors.. a 24 v motor spinning at 3000 rpm is getting over 100 rpm per volt , a 72v motor spinning at 3000 rpm is getting less than 50 rpm per volt.. SO , if you wanted to gain 1500 rpm , which is easier to do ??? run the 72 v motor at 108volts , or simply run the 24 v motor at 36 v ?? ok im done . GO LOW VOLTAGE < it leaves you with more options .
#31231
ok, all. for now, i've ordered from electricscooterparts.com the 36 volt 1000 watt motor. 11 tooth initial sprocket, connected to a 14 tooth transmission that drives a 90 tooth final drive. what's the final ratio? i've tried but don't know how to do the math.

edit: aha. http://www.wikihow.com/Determine-Gear-Ratio tells me that the gears in the middle don't matter. it's still 11 tooth to 90 teeth ratio.. but wouldn't torque be improved? or no difference?
#31232
do those Unite motors have a timing bias on the brushes? when hooked up to forward voltage, are the brushes timed for greater efficiency in that direction of rotation, as opposed to lesser efficiency when the power leads are reversed?
#31271
just had a thought. this motor i bought is nominally a 36 volt motor, for close to 3000 rpms at full. i fully know the rpms will DROP if i run a LOWER voltage through it. i'm wondering about the power requirements, if i run it at 24 volts (motor shouldnt get hot at all, yeh?), does it suck up more juice at full throttle and shorten the battery life, or is it the other way around?

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