QS 3000w midmotor

Electric Motors and Controllers
larsb   10 kW

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Re: QS 3000w midmotor

Post by larsb » Oct 05 2018 12:42pm

Good! motor is still solid. Now get an ASI BAC8000 controller
750$, but it's probably worth it in the long run :D

bionicon   100 W

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Re: QS 3000w midmotor

Post by bionicon » Oct 05 2018 12:45pm

larsb wrote:
Oct 05 2018 12:42pm
Good! motor is still solid. Now get an ASI BAC8000 controller
750$, but it's probably worth it in the long run :D
Too late already ordered a sabvoton 72200 :wink:

larsb   10 kW

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Re: QS 3000w midmotor

Post by larsb » Oct 07 2018 11:32am

I just got the motor moving - man what a difference to the Revolt / kelly KLS i used before!

I'll try not to support any hype before i have a 1000 kms on it but it sure looks good so far :D

bionicon   100 W

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Re: QS 3000w midmotor

Post by bionicon » Oct 11 2018 4:31am

connected today new 72200 controller install and parameters ok, but no power at all it just start at 5amps it will drive but no startingtorque at all, something wrong with controller, or is the motor? this is the third sabvoton i settup so i did twice halltest and everything seems ok .Still no power :(

larsb   10 kW

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Re: QS 3000w midmotor

Post by larsb » Oct 11 2018 9:02am

So you've got smooth rotation at low current or how is it working? Maybe post a video of a test.

Do you have an isolation tester? If so, you could try measuring between each phase end and motor shell.

Do you have another motor you can try the controller with?

bionicon   100 W

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Re: QS 3000w midmotor

Post by bionicon » Oct 11 2018 3:10pm

dont have another motor to test, what do you mean with a isolation tester? A tester to test shorts?So how do you check?
It runs but doesnt have power like it should.

larsb   10 kW

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Re: QS 3000w midmotor

Post by larsb » Oct 11 2018 11:15pm

Some shorts don't show until you reach higher voltage, an isolation tester would show that, it can send a high volt signal
i guess that coil short is not the root cause so if you don't have one then it's no big deal.

I had a powervelocity controller where they had got silicone sealant on the current contacts, that was on all five (b+, b-, phase1-3)
It couldn't initially feed more than 30A due to the poor electrical connection but i could get the full power out after cleaning the contacts. Sabvoton and powervelocity seems to have the same casing so it might be same issue. Check all connections, clean/scrape with some emery cloth if needed.

If you have another throttle it's worth it to try to switch. Is throttle signal value measured/shown in Sabvoton program? (Do you reach 100% throttle?)

bionicon   100 W

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Re: QS 3000w midmotor

Post by bionicon » Oct 12 2018 1:21pm

Problem almost solved trottle dont give maximum volt.It just showed that it gave just 1.94 volt normaly it was 4.8volt.Maybe the trottle is damaged when i blow up my controller :shock: its a domino ,somebody know of this problem? By the way the motor still pulls hard not damaged at all :D

larsb   10 kW

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Re: QS 3000w midmotor

Post by larsb » Oct 12 2018 1:27pm

I'm going to do some proper testing tomorrow :D It'll be interesting to see what the top speed is now with this motor and the belt drive

bionicon   100 W

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Re: QS 3000w midmotor

Post by bionicon » Oct 13 2018 2:01am

You gonne feel the diffrence with the revolt motor its day and night in power :D

larsb   10 kW

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Re: QS 3000w midmotor

Post by larsb » Oct 13 2018 5:09am

Problem almost solved trottle dont give maximum volt.It just showed that it gave just 1.94 volt normaly it was 4.8volt.Maybe the trottle is damaged when i blow up my controller :shock: its a domino ,somebody know of this problem? By the way the motor still pulls hard not damaged at all :D
I'd guess that throttle issue is not connected to your controller blowing if you didn't crash. More likely the throttle connector wires damaged someplace from wear and tear (or the unplugging when you switched controller). You could check if the resistance on throttle side is reasonable, it's 0-5.5kOhm for the Domino, if you get another span then there's an issue.

I did some drag races and top speed trials and my QS motor/controller combo does 105km/h unrestricted and got only slightly warm on the outside :D
There were cutouts during the drag races so the controller seems to struggle, i'll see if i can fix it by lowering the phase current which is at 9960 (A?) now in the program.

:lol: 9960, unreal number :lol: The Chinese spec writers at work again or just a parameter from 0-99.6%..

Yermommy   1 W

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Re: QS 3000w midmotor

Post by Yermommy » Oct 13 2018 10:57am

Using some power to weight ratios of other BLDC motors, the QS 3000 might actually deliver 7kw continuous and around 19kw peak. I did my math using another motor called the ME1115 which weighs 35lbs (QS 138 weighs 24lbs) and delivers 12kw continuous and 30kw peak. This seems to line up with what users are reporting. I can't wait to get my hands on one!

Edit- Yes, I'm aware the ME1115 has a sine/cosine sensor and a built-in fan. I just figured this would help give a ballpark estimate of the QS 138's actual power.

larsb   10 kW

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Re: QS 3000w midmotor

Post by larsb » Oct 13 2018 11:51am

It's not meaningful to do a comparison between those two motors. Power to weight is about several factors.. like the efficiency, thermal mass and heat shedding potential which can differ wildly between two motors.

Me1115 is about 85% efficient in this plot:
image.png
QS3000W is about 90% efficient if you believe QS. Given an assumption that they could both shed 1000W of heat then QS will output 10kW and ME1115 (only) 6.7kW continuous.

Dyno it yourself and there's a believable figure.. Otherwise you'd need a back to back comparison on the same system to compare.
Last edited by larsb on Oct 13 2018 3:12pm, edited 3 times in total.

Yermommy   1 W

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Re: QS 3000w midmotor

Post by Yermommy » Oct 13 2018 12:37pm

Not meaningful? I beg to differ. QS slapped a 3000w rating on it without providing us a continuous rating at all. Like I said in my post, I'm attempting to ballpark it, not get a dyno result.

larsb   10 kW

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Re: QS 3000w midmotor

Post by larsb » Oct 13 2018 12:59pm

Yes, but you have the wrong comparison to land it in the ballpark.

-I'd ask and take bionicons guesstimate of the power first.

-Second option is to do the caculation i made above with some assumption on the heat shedding potential and duty cycle.

bionicon   100 W

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Re: QS 3000w midmotor

Post by bionicon » Oct 13 2018 3:32pm

Larsb what controller are you using?

larsb   10 kW

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Re: QS 3000w midmotor

Post by larsb » Oct 13 2018 3:57pm

I have the Votol em150S controller, bought from qsmotor. It was about 200 USD on a summer sale. I like it so far, seems solid.

http://votol.net/wap/en-us/controller/28.html

Why do you ask?

bionicon   100 W

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Re: QS 3000w midmotor

Post by bionicon » Oct 13 2018 4:16pm

just wanne know what amps your going to feed the motor :D

larsb   10 kW

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Re: QS 3000w midmotor

Post by larsb » Oct 13 2018 4:38pm

My battery is already struggling, >10V drop at peak current. I'll build an additional 20s5p pack if i can fit it somewhere on the bike :D
Last edited by larsb on Oct 19 2018 12:53pm, edited 2 times in total.

Yermommy   1 W

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Re: QS 3000w midmotor

Post by Yermommy » Oct 18 2018 7:28pm

So they want $248 for the motor plus about $100 to ship to USA. Very tempting to buy this and start playing with it before I even begin making my frame.

larsb   10 kW

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Re: QS 3000w midmotor

Post by larsb » Oct 19 2018 12:57pm

bionicon wrote:
Oct 13 2018 4:16pm
just wanne know what amps your going to feed the motor :D
My controller is 220A batt / 470A phase. I think the motor can take more.

Is your Sabvoton controller unlocked?
I'd like to try a controller with something like 750A phase and see if motor still gives more torque or if it's saturated with that kind of current :D

bionicon   100 W

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Re: QS 3000w midmotor

Post by bionicon » Oct 19 2018 3:05pm

yes its unlocked, just now at 250 battamps and 530 phase, i am sure the motor can take more but i am a little afraid to blow up my controller again :oops:

larsb   10 kW

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Re: QS 3000w midmotor

Post by larsb » Oct 20 2018 11:27am

You should've invested in the ASI controller :D

(And learned and told us how to program it for the QS motor :D :D )

aman9010   1 µW

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Re: QS 3000w midmotor

Post by aman9010 » Nov 01 2018 10:18am

Anyone got the whole wiring diagram for the Qs 3Kw Motor, Votol em 150 controller and Display.

larsb   10 kW

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Re: QS 3000w midmotor

Post by larsb » Nov 01 2018 12:31pm

Here, a little crosslinking:
viewtopic.php?f=7&t=95969

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