ok i know that the motor will work with out the controller, but will it work in the long run?? i got 4 scooters with 500w motors but all of the controllers are burnt up and i don't have the money to buy a new so will it hurt the motors in the long run to just use a relay?
If you can't afford the controller how are you going to afford the sprockets, chain, etc? You are going to need very large sprockets on the wheel side. The scooter sprockets (wheel side) are going to be way too small. With such large tires I would be looking for as high a ratio as possible, at least 9 or 10 to 1.
well the tires are really about the same size as the ones on the scooter,they are about 1.5" bigger, so i didn't think that it would be that much diff. and i have all of the stuff off the scooters, i have 4 whole, complete scooters with sprockets and chains. the tires are only 14.5" and roll really easy, it doesn't take much to move them, do you think that it will be that big of a diff? i don't really know anything about ratios so i need help on this?!?!???? lol
and not trying to be mean but no one has really answered the question.... well it hurt the motors to not use the controller??
But the scooters with 500 watt motors go 20mph+ and that's way too fast for a short wheelbase PW with no suspension. In reality you don't want to be going more than 10 or 12 mph at most.
If the wheels are 14.5" that means in one revolution they roll the vehicle forward 3.8' forward. If you want to go 10 mph, you need to travel 52,800' (in an hour). That becomes roughly 13,895 revolutions in an hour which is roughly 232 rpm's.
Your average scooter motor tops out at 2,500 rpm's so to reduce it down to 232 rpm's you need a 10.7 to 1 ratio. If the sprocket on the motor has 11 teeth you would need a wheel sprocket with 118 teeth. It's likely the sprocket you had on the scooter was only 60 teeth or so which will give you a theoretical top speed closer to 20 mph. Again, way too fast. And you will have the poor acceleration and lack of low end torque that scooters are notorious for.
But back to your original question, the motor itself will likely survive being used with just an on/off throttle, though you do have to worry somewhat about stalling the motor and burning it up. The bigger problem is that you are going to draw a huge amount of amps when you first apply power. That means you want at least 10 gauge wire to handle the load. And that also means that you are going to burn your way through some throttle and shifter switches eventually (maybe quite soon).
yes it will eventually hurt the motor. but the switches will burn first.
A motor is just coiled copper wire. with no resistors in it . When a motor is spinning the magnetic fields make the resistance. If you were to unwind all the wire from a motor and hook power to it the wire would melt, fast. Having no slow speed control and just dumping full battery volts across the motor when the motor is not turning, thats the same as unwinding all the wire inside.
Don't think outside the box. Think outside the sphere that the box is floating in.
You could (since you have 4 scooters) use 2 sets of sprockets on each motor. You would need a intermediate shaft with one large gear and one small gear. One chain from motor to a large gear (intermediate shaft), another chain from small gear(intermediate shaft) to a large gear at the wheel. This would cut your ratio in half, cut the speed in half, double your torque, and reduce the chance of stalling the motor. The motor should work on a relay just like the P/W ones do. It will build more heat.
Drive it like you stole it!........out of somebody's garbage!
But the scooters with 500 watt motors go 20mph+ and that's way too fast for a short wheelbase PW with no suspension. In reality you don't want to be going more than 10 or 12 mph at most.
If the wheels are 14.5" that means in one revolution they roll the vehicle forward 3.8' forward. If you want to go 10 mph, you need to travel 52,800' (in an hour). That becomes roughly 13,895 revolutions in an hour which is roughly 232 rpm's.
Your average scooter motor tops out at 2,500 rpm's so to reduce it down to 232 rpm's you need a 10.7 to 1 ratio. If the sprocket on the motor has 11 teeth you would need a wheel sprocket with 118 teeth. It's likely the sprocket you had on the scooter was only 60 teeth or so which will give you a theoretical top speed closer to 20 mph. Again, way too fast. And you will have the poor acceleration and lack of low end torque that scooters are notorious for.
But back to your original question, the motor itself will likely survive being used with just an on/off throttle, though you do have to worry somewhat about stalling the motor and burning it up. The bigger problem is that you are going to draw a huge amount of amps when you first apply power. That means you want at least 10 gauge wire to handle the load. And that also means that you are going to burn your way through some throttle and shifter switches eventually (maybe quite soon).
ok didn't know that wow i may not do it any more lol i did count the teeth there is 11 teeth on the motor and 80 teeth on the sprocket don't know what that means tho lol
You could (since you have 4 scooters) use 2 sets of sprockets on each motor. You would need a intermediate shaft with one large gear and one small gear. One chain from motor to a large gear (intermediate shaft), another chain from small gear(intermediate shaft) to a large gear at the wheel. This would cut your ratio in half, cut the speed in half, double your torque, and reduce the chance of stalling the motor. The motor should work on a relay just like the P/W ones do. It will build more heat.
i like that idea would it really help?? and what if i ran them at 12v, i don't have to do it i just had the motors so i thought i would use them... do you thank its even worth it??
The 80/11 will give you just under 8 to 1 ratio. I'm running that combination on my frankenbeast, which is very fast, and I'm only using 11" tires on it. With 14.5" tires that will increase speed significantly. You could try it.
At 12v it will have hardly any acceleration. 18v might be a better compromise.
would it be wroth it?? i don't really want it faster, i thought that the bigger motors would have more torque.. i want it to have more power not necessarily more speed. would what taz said work??
Taz's idea would work great but it might be tough to get working right. Effectively you will be creating an open chain driven gearbox.
The "best" solution for massive torque would be a scooter motor with built in gear reduction. But that isn't what you own and you are trying to operate within a budget. A better budget solution would to trade for some MFJ gearbox/motors. They have great torque, handle overvolting and will work with the wheel drivers you already have in place.
do you have some type of spacers or washers to give the first gear you attached to some space so its not riding on the gearbox case? Just wondering how you are keeping it tight to the motor shaft but still able to float in the gearbox. More photos of how you did this would be appriciated.
i know it the pic i put up last night i did not have the gear cut, i put the worng pic up thats was what i tried at 1st it did work but it wouldn't hold up
ok this is what i got so far but every body on here knows how it goes one thing leads to another, i am going to add suspension..... i know i know lol, but if everything goes like i think it should be done tomorrow
quote:Originally posted by Iam0014 sorry guys it rain all day didn't get to work on it today
quote:Originally posted by Iam0014 actually the truth is my wife is so amazing i just had to spend the whole day with her!
quote:Originally posted by Iam0014 ok the truth is my wife put that lol
quote:Originally posted by Iam0014 never leave some thing up when you get up even for a min lol but she is amazing
i know she is crazy lol
i have to say i am sorry again, i started a new job to day i was not expecting them to call today because i did not have my uniform yet but they wanted me to start this morning, soooo what i am saying is it may be i lil while b4 i can get the jeep up and running for a video and to see if everything holds up. but as soon as i do i will have a video
2500rpm and the gear i think has 62 teeth i only counted one time so may be off a lil
OK, let's see - if that's a 62 tooth gear removed, and it had 21T gear, that's a factor of about 3...
So the 2500 RPM motors would be the same as a 7500 RPM motor. But stock motors run closer to 17K RPM if I remember correctly.
There will be a ton of torque, but I don't think there will be enough speed....
well it 2500 at 24v how much would it be at 36v?? and i am not really to worry about the speed, i wanted a lot on torque in this one so it can go anywhere
ok got the motors and axle back in tonight ran a test at 12v (the battery was not fully charged) it ran at walking speed and then i put some weight on it, my weight, 215lb... it never slowed down any!! another thing when i started taking the what i thought were shocks will they are fake... :( but i put them on there anyhow just for looks.
If you can get one thread showing past the nut, you can tap a dent in the thread to stop it from backing off.
thats a good idea but they fell off some where in the yard and have not been able to find them they were rev. thread too so i ether have to buy new ones or get set screw gear
quote:thats a good idea but they fell off some where in the yard and have not been able to find them they were rev. thread too so i ether have to buy new ones or get set screw gear
ok this is a video of when i 1st put the motor in i know every one is waiting to see how they work in the jeep but i have to wait to get the gears with set screws
24v scooter motor!!!!
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Posted - 10/21/2010 : 21:10:22
but i love her!
they were rev. thread too 