COLOSSUSWRC-7KW -75KV-NSK

[etard]

Bump!

Wow, this motor completely fell off the radar, seems Jay had big plans and probably ran into inductance problems. I am sending mine out to Thud as a hired assassin, IF he tries to free some electrons with it. I am not that brave.

I just wanted to see if anybody has actually put one of these Baby Collossus' to use. It seems they are making some headway with the big brotha, so maybe it applies here as well?

 

[johnrobholmes]

Indeed it would apply here too. Make some inductive coils to tone down the motor and controller problems are eased. Doesn't help the gear reduction issues, but it makes things easier.

 

[Jay64]

Sorry, I pretty much fell off the face of the earth. Had some major personal and work issues that kept me away from EV stuff for a while. I am getting back into it now and plan to do some work with these motors soon.

 

[Arlo1]

Good to have you back man. I could not imagine something keeping me away from ES!

 

[Jay64]

I've been lurking back here for a bit trying to get caught back up to speed. I saw your threads, looks like you guys are getting along with the bigger version. Have you been doing any work with these smaller 7kw ones?

 

[Arlo1]

I've been lurking back here for a bit trying to get caught back up to speed. I saw your threads, looks like you guys are getting along with the bigger version. Have you been doing any work with these smaller 7kw ones?

I will likely power the smaller collossus with my 24 fet controller and internal halls I have one here but Im behind on other work. Soon though. I plan to make a bmx with one small collossus.

 

[E-racer]

With the lack of availability of the Turnigy 80-100 this would be a perfect time to crank out some colossus 7kw motors. I'm assuming these motors will be affected by rising magnet prices :-/

 

[Thud]

Just a little overview of a collosus motor.

I received a Collosus JR for an inspection & adding halls from member e-tard.

overall a solidly put together motor without the exccesive run out in the magnet can I witnessed on the motor I wound for Md00127.
the windings are tight & well potted. I will confirm the KV tomorrow or monday & run it up.

Makobetti, Where are you? I really would like to get a few stators....more later.
T

 

[Arlo1]

Just a little overview of a collosus motor.

I received a Collosus JR for an inspection & adding halls from member e-tard.

overall a solidly put together motor without the exccesive run out in the magnet can I witnessed on the motor I wound for Md00127.
the windings are tight & well potted. I will confirm the KV tomorrow or monday & run it up.

Makobetti, Where are you? I really would like to get a few stators....more later.
T

Thud did you see my post about the center being loose to the stator? If the stator spins you are in big trouble!

 

[markobetti]

Just a little overview of a collosus motor.

I received a Collosus JR for an inspection & adding halls from member e-tard.

overall a solidly put together motor without the exccesive run out in the magnet can I witnessed on the motor I wound for Md00127.
the windings are tight & well potted. I will confirm the KV tomorrow or monday & run it up.

Makobetti, Where are you? I really would like to get a few stators....more later.
T

Thud i am here . I didnt recive a pm from you i think ...anyways just pm me what you need

 

[markobetti]

Thud , i dont have time for anything i am only designing bikes right now. i am sending you info i promised before on your account to help you develope the motor you designed

 

[Thud]

Arlo:

If the stator spins you are in big trouble!

I do recall that, But it is a common issue for the turnigys also (mostly on the skirt bearing models). I even had one I built for AJ come loose so I guess I am not much better than my chineese brothers in that regard LOL!

IN retrospect, I would love for these motors to be available at their current price points. say what you want about quality controll & i won't argue, but ollar for dolllar they are an increadble bargan for The performance potentials they yeild

 

[AussieJester]

I do recall that, But it is a common issue for the turnigys also (mostly on the skirt bearing models). I even had one I built for AJ come loose so I guess I am not much better than my chineese brothers in that regard LOL!

Well Todd in your defence the stator had been removed a few times so the
press fit was likely not as tight as orignal, was simple fix a smear of
Devcon and it was right as rain

IN retrospect, I would love for these motors to be available at their current price points. say what you want about quality controll & i won't argue, but ollar for dolllar they are an increadble bargan for The performance potentials they yeild

+1 I actually have the bog stock Turnigy running at the moment
haven't changed a thing Windings are nice and tight and the bearings seem fine....for now haha i will
be changing them out along with a new high quality shaft, wont cost more than 50 bucks
and i should be right to go for a loooooong time...99 bucks hard to beat...imo

KiM

 

[Jay64]

Ok, I'm back from my ICE racing. Season is finished, now I need to dive back into EV builds. Trying to get myself back up to speed on things, it's been a while since I've done any EV work. Has anyone come up with a good controller for one of these motors that I might have missed? What controllers are you guys using for the turnigy 80-100s? I know the big colossus is killing controllers, but is there an off the shelf controller that might work for this motor? I'm looking to do a build this month, and I would really like to use one of these motors, but doesn't look like I will have time to also build a custom controller. Going to try to run it in a motored bike event, <11 hp limit. I think this motor might be really good for that. These are good for about 9hp, right?

 

[Jay64]

Oh, yeah, has anyone found a volt limit or amp limit on these yet? Earlier it was guessed that there would be about a 50a limit on these, which would have been 140v. I'm looking to not run so high a volt and maybe more amps. I have a couple, so I could do some tests, but I don't want to blow up a motor on a test that was already done.

 

[Arlo1]

Ok, I'm back from my ICE racing. Season is finished, now I need to dive back into EV builds. Trying to get myself back up to speed on things, it's been a while since I've done any EV work. Has anyone come up with a good controller for one of these motors that I might have missed? What controllers are you guys using for the turnigy 80-100s? I know the big colossus is killing controllers, but is there an off the shelf controller that might work for this motor? I'm looking to do a build this month, and I would really like to use one of these motors, but doesn't look like I will have time to also build a custom controller. Going to try to run it in a motored bike event, <11 hp limit. I think this motor might be really good for that. These are good for about 9hp, right?

I bet you can find the full potential of one of these with a 24fet controller.

 

[Jay64]

Arlo, do you think Lyen's 24 fet controller would work well for one of these motors?
http://endless-sphere.com/forums/viewtopic.php?f=31&t=19612

 

[Thud]

Hey Jay,
With a 75kv you wouldn't want to go above 127v. (after 9500 rpm, the iron losses really kick in & start heating it up)

Amp limit as in continuous?

I been running the 80mm turnigys with the 12fet controllers with good results (did you see E-tards video at Willow springs?) his was detuned a bit & running 4kw peak input. I am adding halls to his colosus tonight along with a couple other re-winds going on for the event.
http://www.youtube.com/watch?v=t6kNuHM6gqM&feature=player_embedded

If i were going to recomend a Lyen contoroller, the 18fet would be as far as you need with these motors...with the stock windings & loaded down,pulling more than 3kw through them they get pretty toasty after 12 minutes.

You can hit em with 10Kw a few times in a row, but for sustained running your going to need to be reasonable.
I will let Arlo chime in...

 

[Arlo1]

I have not run one of these yet i only mesured the inductance and resistance of mine stock. I plan to rewind mine and run it with a 24 fet asap. A 18 fet controller maybe all you need but i think a twelve fet is not enought! You cant make 10hp with a 12 fet! Now i just need to find a drive sprocket for mine.

 

[Jay64]

Hey Jay,
With a 75kv you wouldn't want to go above 127v. (after 9500 rpm, the iron losses really kick in & start heating it up)

Amp limit as in continuous?

I been running the 80mm turnigys with the 12fet controllers with good results (did you see E-tards video at Willow springs?) his was detuned a bit & running 4kw peak input. I am adding halls to his colosus tonight along with a couple other re-winds going on for the event.
http://www.youtube.com/watch?v=t6kNuHM6gqM&feature=player_embedded

If i were going to recomend a Lyen contoroller, the 18fet would be as far as you need with these motors...with the stock windings & loaded down,pulling more than 3k through them they get pretty toasty after 12 minutes.

You can hit em with 10Kw a few times in a row, but for sustained running your going to need to be reasonable.
I will let Arlo chime in...

Pulling more than 3k through them makes them toasty? Is that 3kw or 3k rpm? If so, then wouldn't the 7kw listing be a bit optimistic, even as a peak? I'm not sure what the amp limit would be, either continuous or peak. Jeremy Harris suggested that it is possible that the continous would be about 40-50a. But I haven't seen anyone actually test this. I plan on running this bike for that motorized bicycle event in Cali on the Grange go-cart track. It is 14 turns 8/10ths of a mile. The heat race will be 5 laps, about 4 miles, and the final 12 laps, or about 10 miles. I do plan on driving hard out of the corners, but also want to try to and carry as much corner speed as possible to try to and ease the amp draw while pulling out of corners.

 

[Thud]

sorry J, I droped the "w" in there.
The advetised ratings for these motors are for the rc market & wildly optomistic. 7kw as a peak power level & untill some one puts one on a dyno & finds the point where these quit making tourque we'll have to speculate.

I have been pushing these set ups to fail for the last year or so trying to find the absolute limit to go against mopeds & gas powerd bikes....once you get into the 5kw range of power output on the controllers..stock windings are suspect.

Still a lot of unknowns on the best set ups for these tiny motors. PaulD ran good in Touscon with a single motor on 18cells.
Etard coulda used a bit more top end at willow. I am giving it to him for the Grainge & brinning a lil twin 80/85 to the party myself..

to clarify...these motors hate to spin faster than 10k rpms.....they will prolly handle 7kw peak load for a minute or two....realisticly they will handle repetitive 3-5kw in a racing senario

I have a CA now & am going to start keeping a better log & real world data to silence all the wild claims of power I hear all the time..I am geting so tired of guys quoting peak amp draws like its some passage to manhood.

 

[Arlo1]

I just installed hall sensors in mine at 60 mechanical degrees apart inbetween 2 teeth so if you line a magent up to them it puts two magents over the two windings energised in one phase! Hope I got it right! I plan to dyno mine... I just dont have a drive setup or a bike for it ATM... So soon I will find something and hook one of my modded 24 fet controllers up to it and show it whos boss!

 

[Jay64]

Arlo, post up your results if you don't mind.

Thud, you are going to make it out to the race? That's cool.
Also, you mentioned that you have been pushing these units to fail, have you found a max amp limit yet, either peak or continous? You mention 127v as a max for rpm limits, and also 3-5kw as the max for continous pull, so that would be about 39 amps continuous. But have you tried a lower volt, like 88v lipo (100v max) and say 50 amp, or some other combination? Not sure if these questions are valid or not, just trying to see if I can go with higher amps, if I keep a lower volt max to still maintain the 5kw.

So if I go with the 24 fet controller, it should be more than enough to handle this motor to peak performance, right? I figure I will use one of the motors as a guinnea pig to see what it can take, but would rather not blow up a controller while trying to test the limits of a motor, so going over kill on the controller is fine for this application.

 

[Thud]

Jay,
I will be there & looking foward to meeting up with you. Flying out the 17th & crashing on Etards work shop floor.

I been rewinding the motors & running from 12cells thru 20cells. Max amps & continuous amps are all relitive to the voltages. there is no magic set up.

After fighting with dual sensored controllers for the toucon race, I opted for the tried & true CC Hv160's. In the heat of battle, I whiskey throttled coming off the line & let the controllers go into 200amp range for too long.(& ended my night a bit early) That set up would deliver huge amps for seconds at a time....If i beleive the data logger form Castle, I could pull 19680 watts out of the batteries at max load.(200+ amps on the data logger)Once at top speed & unloaded, the twin motors were consuming 3784 watts (51mph & right on where the gearing was calculated)
I was running a 12s7p 35ah battery in touscon. Motor temps after a friday 10 lap session in touscon was a dangerous 200f (neo magnets fail at 180f but they are cooled when spinning & i was not feeling any power loss due to heat)

Since the enemy is heat. & heat is a function of amperage x voltage & motor resistance & loading. Your mileage will vary. All my testing is holding to that 4-5kw power inputs as the border line of survivability. volts are irrelivent.

Once I got a sensored controller working well, I found amp limiting to around 55 on 18cells was a good compromise between motor smoking heat generation & decent acceleration on a bike geared for 45mph top speed. The math works that right at 4158 watts
My 12fet controllers get fussy when I push them into the 5kw range so I need time to test with the 18fet unit a little more...but I really think the motors are going to be the fail point driving them above 5kw for very long.

a 24fet should be plenty of power to find the breaking point.

Right now those are my staring points for reliability & spirited performance on a single motor build...
Double your motors, double your fun. (triple your build complexity! )

 

[Jay64]

Thud, yeah, I look forward to meeting you guys too. I really appreciate the insight into these motors, that really helped me to get a good starting point for my testing to push the limit without having to re-do a lot of the work you have already completed. No sense burning a motor in a way that it has already been burned. If there is something that I can test that you haven't already tested yet, let me know. Unfortunately I don't have a lot of equipment to test a lot of things, but I'll do what I can to help give back.

So you are currently running two motors? I realize that they aren't these motors, but are you running them in series or parallel? 19680 watts, that great.

I know that with a brushed motor you can run 2 motors off a single controller, but I think I heard somewhere on ES that either you can't do that with a brushless or it is just a lot harder?