Would you be able to tell the winding rating?

Get all your technical information about electric bikes here.
Post Reply
ebike11   100 kW

100 kW
Posts: 1351
Joined: Nov 16 2013 8:01pm
Location: Korea

Would you be able to tell the winding rating?

Post by ebike11 » Jul 19 2019 12:11pm

Hi guys
Would anyone have a fairly good idea of the winding of this qs205 motor? I dont see any stamping/markings

https://ibb.co/JvmXCmG
https://ibb.co/L9tSz7V
https://ibb.co/Sykf46z
https://ibb.co/nn33FnF
https://ibb.co/sWYH8rk

flat tire   1 MW

1 MW
Posts: 1903
Joined: Feb 26 2014 12:20am

Re: Would you be able to tell the winding rating?

Post by flat tire » Jul 19 2019 12:23pm

QS motor says don't exceed 120C indicated by an internal probe. A rule of thumb for "how good is x" is that in a commercial product, "x" won't be any better than it needs to be, and often is worse than it should be.

ebike11   100 kW

100 kW
Posts: 1351
Joined: Nov 16 2013 8:01pm
Location: Korea

Re: Would you be able to tell the winding rating?

Post by ebike11 » Jul 19 2019 12:45pm

flat tire wrote:
Jul 19 2019 12:23pm
QS motor says don't exceed 120C indicated by an internal probe. A rule of thumb for "how good is x" is that in a commercial product, "x" won't be any better than it needs to be, and often is worse than it should be.
I see.
Is there any noticable way to know if its a 3T 4T 5T etc...? I dont know all the versions that they have

flat tire   1 MW

1 MW
Posts: 1903
Joined: Feb 26 2014 12:20am

Re: Would you be able to tell the winding rating?

Post by flat tire » Jul 19 2019 1:01pm

"Winding rating" will be taken to mean max temperature. Are you using a translator?

I'm not sure how the winding count works on that motor since each winding occupies multiple stator slots. But someone else could tell you how to count them and find out the winding count.

ebike11   100 kW

100 kW
Posts: 1351
Joined: Nov 16 2013 8:01pm
Location: Korea

Re: Would you be able to tell the winding rating?

Post by ebike11 » Jul 19 2019 1:10pm

flat tire wrote:
Jul 19 2019 1:01pm
"Winding rating" will be taken to mean max temperature. Are you using a translator?

I'm not sure how the winding count works on that motor since each winding occupies multiple stator slots. But someone else could tell you how to count them and find out the winding count.
Ah sorry i didnt know the exact term.
I mean "turns"

User avatar
ferret   1 kW

1 kW
Posts: 432
Joined: Aug 04 2013 1:58pm
Location: Israel

Re: Would you be able to tell the winding rating?

Post by ferret » Jul 19 2019 3:15pm

If you measure the resistance between the phase wires, someone here could probably tell you which winding you have.

Avner.
Don't believe everything you think.

Cove GNG-Spot build thread

Astral Rune build thread

User avatar
neptronix   100 GW

100 GW
Posts: 14194
Joined: Jun 15 2010 5:56pm
Location: California refugee living in Utah, USA
Contact:

Re: Would you be able to tell the winding rating?

Post by neptronix » Jul 19 2019 4:34pm

The easiest thing to do would be to spin it up and measure the RPM, turn that figure into kV, and compare with what's listed as their kV per winding. A $10 ebay digital laser tachometer does the job here.
"Love and compassion are necessities, not luxuries. Without them, humanity cannot survive." - Dalai Lama

My first major build: 1.6kW 8T MAC motor on a Trek 4500.
The new all-arounder: Leafmotor 1500w @ 4kW on a Turner O2 full suspension.
The monster scooter: 20" eZee on a Cannondale Semi Recumbent.
Whipper-snapper: ? on a lightweight BikeE Semi Recumbent

ebike11   100 kW

100 kW
Posts: 1351
Joined: Nov 16 2013 8:01pm
Location: Korea

Re: Would you be able to tell the winding rating?

Post by ebike11 » Jul 19 2019 5:05pm

neptronix wrote:
Jul 19 2019 4:34pm
The easiest thing to do would be to spin it up and measure the RPM, turn that figure into kV, and compare with what's listed as their kV per winding. A $10 ebay digital laser tachometer does the job here.
I read the less copper the lower the TURN count...maybe i can find other qs205 gut pics to compare to in order to get an estimate

User avatar
neptronix   100 GW

100 GW
Posts: 14194
Joined: Jun 15 2010 5:56pm
Location: California refugee living in Utah, USA
Contact:

Re: Would you be able to tell the winding rating?

Post by neptronix » Jul 19 2019 5:16pm

ebike11 wrote:
Jul 19 2019 5:05pm
I read the less copper the lower the TURN count...maybe i can find other qs205 gut pics to compare to in order to get an estimate
That's not the case for how most motors are designed. A different turn count is typically the same copper fill, but with more strands of a thinner wire, or less strands of a thicker wire.
"Love and compassion are necessities, not luxuries. Without them, humanity cannot survive." - Dalai Lama

My first major build: 1.6kW 8T MAC motor on a Trek 4500.
The new all-arounder: Leafmotor 1500w @ 4kW on a Turner O2 full suspension.
The monster scooter: 20" eZee on a Cannondale Semi Recumbent.
Whipper-snapper: ? on a lightweight BikeE Semi Recumbent

ebike11   100 kW

100 kW
Posts: 1351
Joined: Nov 16 2013 8:01pm
Location: Korea

Re: Would you be able to tell the winding rating?

Post by ebike11 » Jul 19 2019 7:21pm

neptronix wrote:
Jul 19 2019 5:16pm
ebike11 wrote:
Jul 19 2019 5:05pm
I read the less copper the lower the TURN count...maybe i can find other qs205 gut pics to compare to in order to get an estimate
That's not the case for how most motors are designed. A different turn count is typically the same copper fill, but with more strands of a thinner wire, or less strands of a thicker wire.
Ok thx for that..i understand. Would there any other way to determine the turn of the motor? The qs205 has many different turn counts

j bjork   10 kW

10 kW
Posts: 503
Joined: Aug 31 2018 3:01pm
Location: Linköping, Sweden

Re: Would you be able to tell the winding rating?

Post by j bjork » Jul 26 2019 11:55am

If you know what kind of motor you have, you can probably count the number af strands and compare with the number of strands of the different windings avalible for that motor.
Here it is for the 205 50H:
https://www.aliexpress.com/item/3291120 ... 8015.pic_1

larsb   1 MW

1 MW
Posts: 1736
Joined: Dec 10 2014 5:12am
Location: Gothenburg, Sweden

Re: Would you be able to tell the winding rating?

Post by larsb » Jul 26 2019 2:22pm

it really looks like a 2turn in the pics. look at the bundles.
Skärmavbild 2019-07-26 kl. 21.29.24.png
Skärmavbild 2019-07-26 kl. 21.29.24.png (442.13 KiB) Viewed 494 times
why do you want to know?
I think there's a marking on the other side of the stator.
Which width of stator is this?
Ride on!

User avatar
eee291   100 kW

100 kW
Posts: 1078
Joined: Nov 05 2015 4:35pm
Location: Austria, Burgenland

Re: Would you be able to tell the winding rating?

Post by eee291 » Jul 26 2019 3:01pm

I don't think it's a 2T, looks like a 3T if you look at the top right.

larsb   1 MW

1 MW
Posts: 1736
Joined: Dec 10 2014 5:12am
Location: Gothenburg, Sweden

Re: Would you be able to tell the winding rating?

Post by larsb » Jul 26 2019 3:23pm

i'll bet you 1eur that it's 2T :D :D
deal?
Ride on!

User avatar
eee291   100 kW

100 kW
Posts: 1078
Joined: Nov 05 2015 4:35pm
Location: Austria, Burgenland

Re: Would you be able to tell the winding rating?

Post by eee291 » Jul 26 2019 3:56pm

Make it 5€

larsb   1 MW

1 MW
Posts: 1736
Joined: Dec 10 2014 5:12am
Location: Gothenburg, Sweden

Re: Would you be able to tell the winding rating?

Post by larsb » Jul 26 2019 4:10pm

Ok, it's on. :D
You must promise to not bribe ebike11 with 2 Eur to say it's a 3T

Now the big question: which stator is it? Measure the magnets width, it's from 28mm to 50mm according to the table in the link.

If you find the marking then this might help:
image.jpeg
image.jpeg (129.8 KiB) Viewed 468 times
Ride on!

Post Reply