PARADOXICLES
100 mW
- Joined
- Dec 24, 2012
- Messages
- 38
i realized my post was in the wrong section, so im reposting it here and deleting the other, sorry
if youve seen my other posts, you know ive been having alot of trouble with the ebike im building. This is what i have...and whats currently happening with it...
Bike- Shimano Breakpoint duel shocks, 21speed ( now 7 speed with ebike kit)
Motors - GNG Ebike 48v 900w mid mount ebike kit ( 450 w motors x 2)
battery - Ping 48v 15 am LiFePO4
one of my 2 motors burned out at the beginning of summer ( after 40-60 miles total use), after about 3 weeks of debating with "Jon Chan" at gng, and taking motors apart per his request, i proved to them( him) that it had burned out, and that it was because magnet came lose and jammed up the coils, causing them to burn out...... finally they replaced my motor ( for 75$ despite the fact that it was under warranty and that it said " we will pay shipping" ( and when i got it the paid shipping on my package was half of what they charged me...geeerrr).... to install this new motor i had to do a bit of rewiring, the old motors were wired end to end ( black wires soldered together), i figured that this was putting extra stress on the front motor ( first in line, and the one that burnt out), so i decided to wire them up side by side so the second motor dosnt have to draw its energy through the first one, this also gave me an opportunity to give them plugs to disconnect rather then soldered wire, so i can disconcert them as needed for maintenance.
. Today was the first time i test rode it with the replacement motor, and it seamed to be even better then before, was running smother and noticeably faster( closer to the speeds advertised by GNG). After about 1/4 to 1/3 of a mile, i stopped to check things out and make sure every thing was ok.... they wernt.... right away i noticed my motors were very hot, and my brand new one had a some smoke coming out of one of the extra unused screw holes in it. needless to say i rode it back home using only the peddles.... then at home i realized my connector for my battery was slightly melted to its other half ( this is an EC3 plug rated to 60 amps).
im still new to the ebike world, but i think i know why this happened, and what i can possibly do to fix it. i have 2 ideas, and i was hoping some one with more experience could tell me if they will help, or suggest other possible fixes. the 2 motors are connected to one 900w controller, and i think its feeding them too much energy despite the fact that 450+450=900, the same rating as my controller. my idea is to replace the one 900w controller with two 450w controllers, each motor wired to their own controller. this should make each motor 100% independent of the other and reduce extra stress, right? my second idea is to add a circut breaker or fuse in between the motors so when they try to draw, or are given too much energy, the circut breaker/ fuse will pop and protect them. i think circut breakers would be better sense they are not destroyed when used like fuses are.
ive been looking into a 3rd option of rigging up a small radiator to liquid cool the motors, but so far it seams like it will be too big, and expensive, of a set up, plus i shouldnt need something so extreme for an Ebike, especially if it didnt come with the kit.
in the words of Freddie Mercury " i want to ride my bicycle"
any and all help you guys can give me would be greatly appreciated. thanks.
if youve seen my other posts, you know ive been having alot of trouble with the ebike im building. This is what i have...and whats currently happening with it...
Bike- Shimano Breakpoint duel shocks, 21speed ( now 7 speed with ebike kit)
Motors - GNG Ebike 48v 900w mid mount ebike kit ( 450 w motors x 2)
battery - Ping 48v 15 am LiFePO4
one of my 2 motors burned out at the beginning of summer ( after 40-60 miles total use), after about 3 weeks of debating with "Jon Chan" at gng, and taking motors apart per his request, i proved to them( him) that it had burned out, and that it was because magnet came lose and jammed up the coils, causing them to burn out...... finally they replaced my motor ( for 75$ despite the fact that it was under warranty and that it said " we will pay shipping" ( and when i got it the paid shipping on my package was half of what they charged me...geeerrr).... to install this new motor i had to do a bit of rewiring, the old motors were wired end to end ( black wires soldered together), i figured that this was putting extra stress on the front motor ( first in line, and the one that burnt out), so i decided to wire them up side by side so the second motor dosnt have to draw its energy through the first one, this also gave me an opportunity to give them plugs to disconnect rather then soldered wire, so i can disconcert them as needed for maintenance.
. Today was the first time i test rode it with the replacement motor, and it seamed to be even better then before, was running smother and noticeably faster( closer to the speeds advertised by GNG). After about 1/4 to 1/3 of a mile, i stopped to check things out and make sure every thing was ok.... they wernt.... right away i noticed my motors were very hot, and my brand new one had a some smoke coming out of one of the extra unused screw holes in it. needless to say i rode it back home using only the peddles.... then at home i realized my connector for my battery was slightly melted to its other half ( this is an EC3 plug rated to 60 amps).
im still new to the ebike world, but i think i know why this happened, and what i can possibly do to fix it. i have 2 ideas, and i was hoping some one with more experience could tell me if they will help, or suggest other possible fixes. the 2 motors are connected to one 900w controller, and i think its feeding them too much energy despite the fact that 450+450=900, the same rating as my controller. my idea is to replace the one 900w controller with two 450w controllers, each motor wired to their own controller. this should make each motor 100% independent of the other and reduce extra stress, right? my second idea is to add a circut breaker or fuse in between the motors so when they try to draw, or are given too much energy, the circut breaker/ fuse will pop and protect them. i think circut breakers would be better sense they are not destroyed when used like fuses are.
ive been looking into a 3rd option of rigging up a small radiator to liquid cool the motors, but so far it seams like it will be too big, and expensive, of a set up, plus i shouldnt need something so extreme for an Ebike, especially if it didnt come with the kit.
in the words of Freddie Mercury " i want to ride my bicycle"
any and all help you guys can give me would be greatly appreciated. thanks.