flippy said:How much power do you actually need to sustain 100kph?
And yes, magnets makes regular gravity balancing impossible.
icherouveim said:Hello,
There is something else you should consider. My first battery pack I had 3 years ago it was made by 18650B panasonic cells. They were very weak, the battery pack was sagging alot. Just to give you an example when the battery pack was fully charged each cell was sagging at 3.3V!! while I was drawing only 4amps per cell and you draw almost 9! This battery pack is going to die very soon.
So firstly you need a new stronger battery pack and if you still have the same low top speed then you can change controller and or modify-replace your motor.
flippy said:that trick does not work with hub motors with the tire directly on it.
how do you stick on lead on the edge were there is no flat space for it and how you you overcome the cogging force of the magnets during a balancing? do you rip all the magnets out?John in CR said:flippy said:that trick does not work with hub motors with the tire directly on it.
Of course one or more of my methods work on motors with integrated rims. I've done it lots of times. I'd recommend the sticky weights method though, as adding weight at the disc brake bolts is more time consuming. I've pretty much adopted the sticky weight method for all my builds...simple and quick.
flippy said:how do you stick on lead on the edge were there is no flat space for it
Since you need to balance it all the way up to max no load speed, you use electricity and a controller to overcome the cogging force. Here's a clip of one of mine spinning up to 193kph. I obviously wouldn't do that inside like that without perfect balance, and once you put a tire on they're always significantly out of balance. https://www.youtube.com/watch?v=AM6DAnoa8pEflippy said:and how you you overcome the cogging force of the magnets during a balancing? do you rip all the magnets out?
flippy said:not trying to be dumb but i just dont see anyone doing anything proper exept making a bunch of guesses and keep slapping on random weights at random locations until it shakes less.
johnnyz said:icherouveim said:Hello,
There is something else you should consider. My first battery pack I had 3 years ago it was made by 18650B panasonic cells. They were very weak, the battery pack was sagging alot. Just to give you an example when the battery pack was fully charged each cell was sagging at 3.3V!! while I was drawing only 4amps per cell and you draw almost 9! This battery pack is going to die very soon.
So firstly you need a new stronger battery pack and if you still have the same low top speed then you can change controller and or modify-replace your motor.
Thought I should reply to this...ifwhat you say is true about the sag at only 4amps per cell, then without a doubt you have WAY too HIGH RESISTANCE somewhere..and probably in the pack itself if it was assembled using crappy nickle strip especially on the series connections...that is causing the cells to sag...if not the pack then somewhere you got a bottleneck.....
icherouveim said:johnnyz said:icherouveim said:Hello,
There is something else you should consider. My first battery pack I had 3 years ago it was made by 18650B panasonic cells. They were very weak, the battery pack was sagging alot. Just to give you an example when the battery pack was fully charged each cell was sagging at 3.3V!! while I was drawing only 4amps per cell and you draw almost 9! This battery pack is going to die very soon.
So firstly you need a new stronger battery pack and if you still have the same low top speed then you can change controller and or modify-replace your motor.
Thought I should reply to this...ifwhat you say is true about the sag at only 4amps per cell, then without a doubt you have WAY too HIGH RESISTANCE somewhere..and probably in the pack itself if it was assembled using crappy nickle strip especially on the series connections...that is causing the cells to sag...if not the pack then somewhere you got a bottleneck.....
Hello,
The pack was well made and it was working fine for the first year, after that it started to sag like crazy. When I wrote about this at the forum they told me (Alex and some other guys) that 18650B cells are made for low power devices laptops etc and should not be used for ebike use because they die very quickly. You know I was really disappointed with Panasonic because I didn't abuse the cells my controller was 25A and this is was a 6P pack, this is about 4.2A per cell while the max current for these cells according the specs is 6.7A. On the other hand Panasonic PF cells as they say are very good value for ebike batteries. I haven't tried them yet.
johnnyz said:... soldered 10 gauge solid copper wire with a Tesla style connections ...
Buk___ said:johnnyz said:... soldered 10 gauge solid copper wire with a Tesla style connections ...
What gauge/type of wire did you use for your fusible links?
x.l.r.8 said:That controller looks suspiciously like the daymak em1. i would go for a recognized controller rather than one of these. That just my personal opinion though
Buk___ said:x.l.r.8 said:That controller looks suspiciously like the daymak em1. i would go for a recognized controller rather than one of these. That just my personal opinion though
What is the betting that Daymak buy their controllers from YuYang King?
precharge resistor is supplied with the controller. you an hook up the contactor directly to the controller as long as the contactor is <2A.johnnyz said:After talking to Damon at Qsmotors, he is recommending Qsmotor's version of this Kelly Controller....
KLSH.jpg
Problem is that,while the specs are good ,it needs a pre-charge resistor...Since im running with a 100 volt pack, any suggestions?
John
flippy said:precharge resistor is supplied with the controller. you an hook up the contactor directly to the controller as long as the contactor is <2A.johnnyz said:After talking to Damon at Qsmotors, he is recommending Qsmotor's version of this Kelly Controller....
KLSH.jpg
Problem is that,while the specs are good ,it needs a pre-charge resistor...Since im running with a 100 volt pack, any suggestions?
John
if you want i have a sevcon gen4 300A wich i am not going to use and is for sale. it is insanely programable and has field weakening if you want to use that for more top speed beyond the battery pack voltage. the kelly does not have that. programming does require a fairly expensive cable ($100~300) but you need that anyway if you want a sevcon. they are superior to the kelly in terms of capabillity and tweaking you can do.