Denny
Canned Monster
What kind of electric cars do you own?
Polaris
- Thread starter Functional Artist
- Start date
Functional Artist
Well-known member
Hey Denny,
I have a truck load (literally) of custom built, mini-electric vehicles (IIRC the count is up to ~20, by now)
...& my diesel truck, if I need ta haul 'em around
Denny
Canned Monster
Buy why don’t you own an electric car?
Functional Artist
Well-known member
I have a street legal electric motorcycle
...& I've put almost 2,000 miles on it, since the conversion
No time, for a car
...I'ma too busy towing other folks cars (for the mulah)
...& designin' & buildin' my own stuff
* FYI:
I sold my last car (a Black on Black on Black, 1972 Monte Carlo) back in 1991, ta make a truck payment
...'cause my truck makes me money
...& the car does just the opposite
* FYI 2:
My left brain had been workin' on a full size street legal Morgan type vehicle
...but then, I heard about Electrathon America
...& "off" I went
Denny
Canned Monster
Sounds like you’re saying the electric car technology is not quite up to snuff yet. 
Why isn’t your truck powered by electricity yet?
Why isn’t your truck powered by electricity yet?
Functional Artist
Well-known member
Hey Denny,Sounds like you’re saying the electric car technology is not quite up to snuff yet.
Take a ride in a Tesla
...& then, you tell me "if" it's up to snuff
...& their workin' on a semi truck too
Back to Polaris, I removed the motor
...& did an autopsy
Yup, we burnt some stuff
Close up (actually burned-out sections of the wire)
Damaged the brush holder too
Another close up
ezcome-ezgo
G'me sumthin to write on
That stinks. But we know you are up to the task of repair! Tow companies around here are making a comfortable living towing electric cars, don't knock them.
Functional Artist
Well-known member
Testing Baby! I love testing
...that's what it's all about!
But, sadly that motor isn't repairable
Besides some of the windings burning out
...the brush holder board got damaged
...& the Armature too
Functional Artist
Well-known member
I tow over 1,000 car per year
...been doin' it for almost 30 years. now
...& still haven't towed an electric car
...but, I have towed a bunch of them hybrid cars (1/2 gas powered & 1/2 electric drive)
...& I think the ICE system, was the culprit, every time
Denny
Canned Monster
The brush holder looks usable with some polishing, but the rotor (armature) is junk. How are you planning on cooling the motor down there? I imagine there can’t be much air flow down there. Will there be a small fan and ducting?
Functional Artist
Well-known member
Hey Denny,
When I "ran" this motor, on the Hell-raiser kart, with the 400A controller
...it was only a test
When I first took off from a dead stop
...the meter showed that little 1,000W motor, was registering as ~5,000W
...& the corresponding Amperage draw was ~108A (see video @ ~1:40)
& then,
Further along in the video, when accelerating out of a turn
...the motor registered as ~5,800W
...& the corresponding Amp reading was ~122A (@~2:15)
& later
When I "punched it" @~3:25 is when the flames started shooting out
...& I just happened to get it on camera
So, yes, I made a little 1,000W motor with a ~20A rating
...output ~5X it's "factory specified book rating"
That my friend, is what racing is all about
...doing more with less
...& pushing things to their limits (safely of course)
&
That pertains to the power train
...the chassis
...& the driver too
Functional Artist
Well-known member
For comparison, I have the same (48V 1,000W MY-1020) motor on my Excalibur kart
...but, with the proper YK-31 (20A) speed controller
Now, if you notice, in this video (another wealth of "real world" data)
So, upon first take off/hard acceleration (@2:02)
...the motor registered as 1,644W
...& the corresponding Amperage draw was ~34.45A
Then,
At (2:04) the motor registers as ~1,712W
...& the amp draw was ~37.69A
&
The highest numbers that I saw were ~1,760W (@~2:05)
& ~38.26A
Even,
Upon accelerating out of a "donut" (@~4.:56)
...the motor registered as ~1,701W
...& the Amp draw was ~37.77A
*Also, did you notice the massive Voltage drop
The Voltage is ~51.42V just before the first "take off" (@~2:04)
...then, drops to ~45.43V (which is like a 6V drop from a 48V battery pack)
But, to the packs credit, even after draining ~64Wh out of it, it still showed ~50.69V
...& then, after 190Wh used, it still showed ~48.91V
** Now, in comparison, when I tested this same battery pack on Polaris, a couple of days ago
...it started off at ~51.68V
...& then, after only ~9Wh used it was down to ~51.12V
IMO that kinda Voltage drop is the biggest indicator of "wear" or capacity loss
&
During that "unloaded test", the voltage dropped all the way down to ~44.8V (@~2:21)
...that's like a ~6V-7V drop
...so, imagine what it would do "under a load"? (Yup, I'm not gonna bother)
...but, with the proper YK-31 (20A) speed controller
Now, if you notice, in this video (another wealth of "real world" data)
So, upon first take off/hard acceleration (@2:02)
...the motor registered as 1,644W
...& the corresponding Amperage draw was ~34.45A
Then,
At (2:04) the motor registers as ~1,712W
...& the amp draw was ~37.69A
&
The highest numbers that I saw were ~1,760W (@~2:05)
& ~38.26A
Even,
Upon accelerating out of a "donut" (@~4.:56)
...the motor registered as ~1,701W
...& the Amp draw was ~37.77A
*Also, did you notice the massive Voltage drop
The Voltage is ~51.42V just before the first "take off" (@~2:04)
...then, drops to ~45.43V (which is like a 6V drop from a 48V battery pack)
But, to the packs credit, even after draining ~64Wh out of it, it still showed ~50.69V
...& then, after 190Wh used, it still showed ~48.91V
** Now, in comparison, when I tested this same battery pack on Polaris, a couple of days ago
...it started off at ~51.68V
...& then, after only ~9Wh used it was down to ~51.12V
IMO that kinda Voltage drop is the biggest indicator of "wear" or capacity loss
&
During that "unloaded test", the voltage dropped all the way down to ~44.8V (@~2:21)
...that's like a ~6V-7V drop
...so, imagine what it would do "under a load"?
(Yup, I'm not gonna bother) Denny
Canned Monster
So it appears in essence you have been overworking your batteries with excessive amp draw when compared to the rating of the batteries?
Functional Artist
Well-known member
Denny
Canned Monster
Where’s my face palm smiley!!
Master Hack
Well-known member
That's the problem with that mysterious invisible fuel, ya get about .002 seconds to know something ain't right. Liquid fuel on the other hand just catches fire!
Functional Artist
Well-known member
Functional Artist
Well-known member
Um...where was I...
Oh...yea...we need an adapter thingie, kinda like this
Actually, we need (2) of them
...& they should "go" about like this
...& with the wheel
Yup, that looks better
Looks like we now have, a bit over 3 1/2"
Oh...yea...we need an adapter thingie, kinda like this
Actually, we need (2) of them
...& they should "go" about like this
...& with the wheel
Yup, that looks better
Looks like we now have, a bit over 3 1/2"
Denny
Canned Monster
Aren’t you worried about all of that cracking from side loading in turns? Might be better off with a chain tensioner?
Functional Artist
Well-known member
Hey Denny,
Are you referring to the rear wheel adapters?
Their purpose is to raise the rear of chassis ~2"
Before the GC was only ~1 1/2"
...& now we have ~3 1/2"