QS273 Re-Winding, Looking for someone in UK

R

Reecew89

100 mW
Joined
Aug 25, 2021
Messages
35
As title,

Chinese lied and sent me what i thought was a QS273 5T 50H instead they now say agreement qas for QS273 2.5T 50H......

Anyone UK based i can ask a price for a re-wind, Looking for lot more torque, Higher RPM i will be going 100+ volts so i can achieve that goal via that way.

Any ideas etc welcome
 
https://www.google.co.uk/maps/search/motor+rewinding+service/@51.5884217,-0.2993169,11z/data=!3m1!4b1
 
I think i already spoke with them and they said they don't deal with these types of motors etc.

Will give them a call tomorrow and find out for sure tho.

Thanks for that.
 
Reecew89 said:
I think i already spoke with them and they said they don't deal with these types of motors etc.
Click to expand...
I don't know where you live. But I think there are several motor re-winding services near you. I'm sure you will find one where this operation is performed by a human. I think even a person with average intelligence will know how to make 5T out of 2.5T.
 
Yep, I tried calling many places loads just said won't work on ebike motors etc (Why i have no idea).

2.5t has good top end but lack of torque want to re-wind it to 5t for that torque and off the line acceleration.
 
It can be assumed that they lack the tools to remove the stator. If you are sure that you can purchase such a tool and separate the stator from the rotor, then they may only be able to rewind the motor itself. In fact, it's worth trying to find out if they can do the job on those terms.
 
I have made a tool using a bearing puller etc (Youtube was a godsend!) Have had the motor apart myself so its pretty easy i just cannot deal with the faff of re-winding 🤣
 
Yeah not many have small hands and patience to rewind a motor

Reecew89 said:
I have made a tool using a bearing puller etc (Youtube was a godsend!) Have had the motor apart myself so its pretty easy i just cannot deal with the faff of re-winding 🤣
Click to expand...
 
Since KV doesn't affect torque potential of the motor, should you not just buy a controller which can push more phase amps?
 
From my understanding and research KV does have a direct effect on torque, Lower KV meaning higher potential speed higher KV rating meaning more torque and less speed.

I already tried a controller 200 DC amps and 300 Phase amps and i could twist the throttle and stand and near enough hold the bike BUT once it was moving it wanted to go like crazy, I want initial torque more the top speed.
 
Sorry but it doesn't.

Kv affects torque/Amp, but also resistance. The net effect is that these cancel each other out so that a low kv motor needs lots of amps to make torque, and a high kv motor needs less amps to make torque, whilst they both produce the same copper losses at the same torque.

It sounds like you have a starting issue - are you running sensorless?

Anyway,, try buying a better controller. It will be better and cheaper.
 
Ah right that makes sense,

Tried the following controllers

SABVOTON SVMC 72150
SABVOTON SVMC 72200
VESC 100/250

Sensored and hall test on all 3 controllers to ensure they picked up the sensor and position correctly.

All acted the same way even set up correctly, When i spoke with QS Motors they said i need to increase the T count for more torque if thats what i wanted.
 
Increasing the number of turns and decreasing the kv does shift brushless motor performance from more speed to more torque.

Going from 2.5T to 5T really isnt going to translate into a significant amount of resistance. And overall you should see an improvement in efficency.
 
TrotterBob said:
Increasing the number of turns and decreasing the kv does shift brushless motor performance from more speed to more torque.

Going from 2.5T to 5T really isnt going to translate into a significant amount of resistance. And overall you should see an improvement in efficency.
Click to expand...

Maximum torque is fixed by motor architecture and materials. Fast windings max out at the same torque as slow windings, but they need more current to do it. And they may also need less voltage to run in a usable speed range. Torque per amp is in proportion to the number of turns, up to the maximum value allowed by the motor's design.

Winding counts are a means of corresponding speed and torque to the amount of power you have to work with, while using batteries and controllers that are available and affordable. Neither high nor low turn counts are an objective in their own right; they are just a means of reconciling road speed to controller/battery power, wheel diameter, gear ratio, and other relevant factors.

The turn count of any motor that is capable of the highest theoretical maximum power is 1T. But before you get there, other limitations that are external to the motor will usually prevent it from reaching such potential in the real world.
 
TrotterBob said:
Increasing the number of turns and decreasing the kv does shift brushless motor performance from more speed to more torque.

Going from 2.5T to 5T really isnt going to translate into a significant amount of resistance. And overall you should see an improvement in efficency.
Click to expand...

See others have said at 5t they struggled to keep the front end down, You have me curious now.
 
j bjork said:
Please, you will need a serious controller for that motor anyway.
Those toys are for toy motors.
Click to expand...

Controller is coming, Waiting on new Rion Tronic it packs a punch! Or i may go ASI 8000, Building my battery using P42a's 😏
 
Reecew89 said:
As title,

Chinese lied and sent me what i thought was a QS273 5T 50H instead they now say agreement qas for QS273 2.5T 50H......
Click to expand...

Use half the voltage and twice the amps to accomplish exactly the same thing as you had in mind. 48-52 volt systems are a lot easier to find and less dangerous to work with than 100V anyway.
 
Chalo said:
Reecew89 said:
As title,

Chinese lied and sent me what i thought was a QS273 5T 50H instead they now say agreement qas for QS273 2.5T 50H......
Click to expand...

Use half the voltage and twice the amps to accomplish exactly the same thing as you had in mind. 48-52 volt systems are a lot easier to find and less dangerous to work with than 100V anyway.
Click to expand...

which requires complete rework of the hardware, splitting the battery and making new connections between new parallel groups, new bms to handle fewer S groups, new twice as thick wiring harness, new controller to handle less voltage and more amps...

i get the feeling that this is exactly what OP was trying to avoid
 
xfrankie said:
Chalo said:
Reecew89 said:
As title,

Chinese lied and sent me what i thought was a QS273 5T 50H instead they now say agreement qas for QS273 2.5T 50H......
Click to expand...

Use half the voltage and twice the amps to accomplish exactly the same thing as you had in mind. 48-52 volt systems are a lot easier to find and less dangerous to work with than 100V anyway.
Click to expand...

which requires complete rework of the hardware, splitting the battery and making new connections between new parallel groups, new bms to handle fewer S groups, new twice as thick wiring harness, new controller to handle less voltage and more amps...

i get the feeling that this is exactly what OP was trying to avoid
Click to expand...

Quite the opposite to be honest, Bike has had a full strip down, Ferrofluid going in, Thicker phase wires, Cooling fins on the motor etc etc Just curious as QS Motora said i need a higher T count for torque which i understand but i have enough power to send to generate torque i need well i thought anyway.
 
Is it wired star or Delta on the stator? If Delta, you could get quite a lot of the way towards 5t by just reconfiguring to star.
 
Reecew89 said:
Just curious as QS Motora said i need a higher T count for torque which i understand but i have enough power to send to generate torque i need well i thought anyway.
Click to expand...
It is very rare for those who speak English to have much technical knowledge.

Achieving your desired top rpm later in your throttle range helps with efficiency,

and higher voltages are a bit better for acceleration, but less efficient at low speeds

in general, when you change the winding, you ONLY change what ratio of voltage to amperes are needed to make a certain amount of power.

https://endless-sphere.com/forums/viewtopic.php?t=108781
https://endless-sphere.com/forums/viewtopic.php?p=1592954#p1592954

https://endless-sphere.com/forums/viewtopic.php?t=109082

https://endless-sphere.com/forums/viewtopic.php?t=105510

https://endless-sphere.com/forums/viewtopic.php?p=1557363#p1557363

https://endless-sphere.com/forums/viewtopic.php?p=1578274#p1578274

https://endless-sphere.com/forums/viewtopic.php?t=106117

https://endless-sphere.com/forums/viewtopic.php?p=1577684#p1577684

https://endless-sphere.com/forums/viewtopic.php?p=1670686#p1670686

https://endless-sphere.com/forums/viewtopic.php?p=1670083#p1670083

https://endless-sphere.com/forums/viewtopic.php?p=1666676#p1666676

https://endless-sphere.com/forums/viewtopic.php?t=111924

https://endless-sphere.com/forums/viewtopic.php?p=1653764#p1653764

https://endless-sphere.com/forums/viewtopic.php?p=1650700#p1650700
 
mxlemming said:
Is it wired star or Delta on the stator? If Delta, you could get quite a lot of the way towards 5t by just reconfiguring to star.
Click to expand...

Sorry for late reply life has been hectic!

I have no idea, Pretty clued up with various things but motors im not, Will open it up again and take a few pictures.

I am curious if i can push enough power before damaging the motor to get my desired torque failing that ill buy another motor ie a 4t or 5t.
 
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