QSMOTOR,0.5-12kW Electric Hub Motor & Mid Drive Motor Manufacture China

[QSMOTOR]

ok !
any chance of a link to a freewheel that is in the pics on the invoice vito?

Vito: I focused on this issue this time, the thread of motor is M35*1 (metric system).
I don't know the link for the freewheel.
We have some freewheels with M35*1 thread, 1/2*1/8*16T, 1/2*1/8*18T and 1/2*1/8*20T.
If you need, I could send sample for testing.

For new version, we will make it English thread, B 1.375*24G.
Which could fit with Ditca freewheel.

Best Regards

 

[ridethelightning]

thanks for reply vito.

a sample of the 16t freewheel would be much appreciated.

 

[gensem]

Very nice looking motor for ebikes (qs205)

Vito do you happen to know the inductance for the 3T,4T,5T windings?

 

[QSMOTOR]

thanks for reply vito.
a sample of the 16t freewheel would be much appreciated.

Vito: With my pleasure. We will provide the freewheel for free (not include shipping cost).
And forward the tracking number once I got it.

Best Regards

 

[QSMOTOR]

Very nice looking motor for ebikes (qs205)

Vito do you happen to know the inductance for the 3T,4T,5T windings?

Vito: Thank you, it's a pity that we seldom test inductance for motors.
I will try to ask our Engineer to have a test in near future.

Best Regards

 

[gensem]

Very nice looking motor for ebikes (qs205)

Vito do you happen to know the inductance for the 3T,4T,5T windings?

Vito: Thank you, it's a pity that we seldom test inductance for motors.
I will try to ask our Engineer to have a test in near future.

Best Regards

Thanks for your fast reply. Please do ask the engineering asap, its very important to know the inductance to estimate how many volts and AMPS would be safe to run in a given controller motor combo.

 

[flathill]

Quick get this beast on a bike with a sevcon and burn it up on a dyno

Let's see where it saturates!

This motor has so much potential. Awesome work QS. Love the user guide also. Do you know when the FOC Kelly controllers will be released?

 

[QSMOTOR]

Do you know when the FOC Kelly controllers will be released?

Vito: Thank you. I have no idea about FOC Kelly Controller, do you have link or picture of that?
Do you mean sine wave controller?
We cooperate very well with Kelly, but I haven't heard FOC Kelly Controller before.

Best Regards

 

[flathill]

Rumor is Kelly is working on a new line of FOC controllers. I though you might know more since you work closely with them. Try to find out if there is any truth to this if you can thanks.

Also do you have an updated drawing on the new version of the QS 205 to be released at the end of June? How much wider and heavier is it going to be with the longer axle, thicker side covers, and more side cover to stator spacing? Will this update only apply to V3 motors or V1/2/3. Is the motor devlopment going well and still on track to ship June 28?

 

[cwah]

Vito,

Would you be able to sell a kit with sine wave controller and motor with 135-140mm dropout to reach 70km/h on either 48v or 72v?

I need decent speed but also very good torque as I have some hills to climb.

Thank you

 

[QSMOTOR]

Vito,

Would you be able to sell a kit with sine wave controller and motor with 135-140mm dropout to reach 70km/h on either 48v or 72v?

I need decent speed but also very good torque as I have some hills to climb.

Thank you

Vito: We could provide motor with sine wave controller (e.g. Sabvoton Controller SVMC072100).
Here is the link of controller for reference.
http://www.sabvoton.com/product/72v-4kw-brushless-motor-controller.html#.VWuufiOQvSw

For dropout of motor, we could only make it above 150mm (include 150mm) for 70KPH, and we could to make it 72V.

Best Regardfs

 

[John in CR]

Vito,

Earlier guys were asking about copper strand counts, their size, etc., and while it's good to compare total copper on each tooth, the best information a manufacturer can provide for prospective customers to predict performance is 3 numbers:
1. Kv in rpm/volt- Not only does it help predict speed, but it also gives you the torque per amp.
2. Phase-to-phase resistance- This is important, because it puts Kv in context by giving us an idea of current handling.
3. No load current (ideally at 2 different rpm)- Measure this with no tire or, if possible no rim. Phase-to-phase resistance tells us copper losses, and no-load current gives us the losses in the iron.

This information is simple to measure and gives us a wealth of useful data for making motor choices.

 

[madin88]

Vito, it would be interesting to know at what torque levels the iron core of V3 205 50H type starts to saturate and how it compares to same sized V2 type.

 

[QSMOTOR]

Vito, it would be interesting to know at what torque levels the iron core of V3 205 50H type starts to saturate and how it compares to same sized V2 type.

Hi Martin, for V3 205 50H motor, it's aluminium core. For comparsion between V3 205 50H & V2 205 50H.
Please refer to attached two test report.

Best Regards

 

[QSMOTOR]

Hi John, thank you for your advise, here is my comment below.

Earlier guys were asking about copper strand counts, their size, etc., and while it's good to compare total copper on each tooth, the best information a manufacturer can provide for prospective customers to predict performance is 3 numbers:
1. Kv in rpm/volt- Not only does it help predict speed, but it also gives you the torque per amp.

Vito: Ok, here it is.

Btw., we could predict speed by below.
V=0.9*RPM*2πr*60/1000
V (KPH), RPM=un-load RPM, r=radius of tire
For torque per amp, could you please advise how to calculate it?

2. Phase-to-phase resistance- This is important, because it puts Kv in context by giving us an idea of current handling.

Vito: OK. We could check phase-to-phase resistance before delivery (for customized motors).
Then I will update the date in ES accordingly.
Moreover, I would try to ask our Enginner to test inductance value if possible.

3. No load current (ideally at 2 different rpm)- Measure this with no tire or, if possible no rim. Phase-to-phase resistance tells us copper losses, and no-load current gives us the losses in the iron.

Vito: Do you mean no-load battery current? Please refer to attached four test report.

If any news, will keep updating on ES.

Best Regards

 

[QSMOTOR]

Rumor is Kelly is working on a new line of FOC controllers. I though you might know more since you work closely with them. Try to find out if there is any truth to this if you can thanks.

Vito: Kelly has developed three Sine Wave Field-Oriented Control (FOC) contrlloer For BLDC Motor.
There are three model, KBLS7280 (equal to KEB72801), KBLS7210 (equal to KEB72101), KBLS7212 (equal to KEB72121).
For more informaiton, you could check with Kelly or waiting for your official information.

Also do you have an updated drawing on the new version of the QS 205 to be released at the end of June?
How much wider and heavier is it going to be with the longer axle, thicker side covers, and more side cover to stator spacing?

Vito: For details, please refer to attached drawing "QS 205 3kW Spoke Hub Motor Drawing 150mm dropouts English thread 2015.05.26.pdf"
& SPEC "3kW NEW QS Motor Quotation & SPEC.pdf".

It's a pity that we could not provide the motor during the period until 28th June. 2015.
However, To make the motor asap, we could accept reservation for new version motor.
We accpet 30% deposit in advance, and rest 70% payment before delivery.
Generally, the payment method is 100% in advance.
For the real weight, it's similar as old version, and I will weigh it once it's ready.

Will this update only apply to V3 motors or V1/2/3. Is the motor devlopment going well and still on track to ship June 28?

Vito: It could apply to any type (V1 V2 & V3). So far, it goes on well.
New mould seems to be ready within 15 working days, all the motor part will be ready before 28th June.
For new motor, it take 13-15 working days after 28th June.

If any question, please feel free to contact with us.

Best Regards

 

[gensem]

3.5T (QS V3 205 50H WP3000W72V 956RPM 33X4+33X3 Test.pdf) seems like the best of the batch.
But i would expect the no-load current to be arround 2amps@1000rpm.
Vitto was this test made with a wheel attached to the hubmotor?

 

[flathill]

...

 

[flathill]

Vito, it would be interesting to know at what torque levels the iron core of V3 205 50H type starts to saturate and how it compares to same sized V2 type.

Hi Martin, for V3 205 50H motor, it's aluminium core. For comparsion between V3 205 50H & V2 205 50H.
Please refer to attached two test report.

Best Regards

Yeah something is wrong on the this V3 datasheet as well, which comparing V2 vs V2 at similar Kv

Note the No_Load output power (输出功率) is 190.6W

The 不加载点(No_Load) row on the first page is pulling data from the first test point on the second page which on the V3 test/datasheet is not at 0 torque (转矩) like it should be:

1st test point V2 = 72.60 2.703 196.2 0.0 670.9 1.68 0.8 (V A W N.m rpm W %)
( QS V2 205 50H 72V3000W 670RPM 18X4 87% Test.pdf)

1st test point V3 = 72.28 5.246 379.2 2.8 650 190.6 50.3 (V A W N.m rpm W %)
(QS V3 205 50H WP72V3000W 650RPM 24X5 89.8% Test.pdf)

 

[QSMOTOR]

Vito, it would be interesting to know at what torque levels the iron core of V3 205 50H type starts to saturate and how it compares to same sized V2 type.

Hi Martin, for V3 205 50H motor, it's aluminium core. For comparsion between V3 205 50H & V2 205 50H.
Please refer to attached two test report.

Best Regards

Yeah something is wrong on the this V3 datasheet as well, which comparing V2 vs V2 at similar Kv

Note the No_Load output power (输出功率) is 190.6W

The 不加载点(No_Load) row on the first page is pulling data from the first test point on the second page which on the V3 test/datasheet is not at 0 torque (转矩) like it should be:

1st test point V2 = 72.60 2.703 196.2 0.0 670.9 1.68 0.8 (V A W N.m rpm W %)
( QS V2 205 50H 72V3000W 670RPM 18X4 87% Test.pdf)

1st test point V3 = 72.28 5.246 379.2 2.8 650 190.6 50.3 (V A W N.m rpm W %)
(QS V3 205 50H WP72V3000W 650RPM 24X5 89.8% Test.pdf)

Vito: Thank you for your advise, I also notice the no-load torque should be approximatel 0 N.m, or less than 1 N.m.
I will ask our engineer to make another test if new sample is ready.

Best Regards

 

[QSMOTOR]

3.5T (QS V3 205 50H WP3000W72V 956RPM 33X4+33X3 Test.pdf) seems like the best of the batch.
But i would expect the no-load current to be arround 2amps@1000rpm.
Vitto was this test made with a wheel attached to the hubmotor?

Vito: The test is for 10inch V3 205 50H 3000W hub motor, so there is 10inch e-scooter wheel.
Enclosed you will find another test "QS V3 205 50H 72V3000W Spoke Motor 1029.9RPM Test.pdf".
P.S.: It is test for spoke motor without wheel.

Best Regards

 

[gensem]

3.5T (QS V3 205 50H WP3000W72V 956RPM 33X4+33X3 Test.pdf) seems like the best of the batch.
But i would expect the no-load current to be arround 2amps@1000rpm.
Vitto was this test made with a wheel attached to the hubmotor?

Vito: The test is for 10inch V3 205 50H 3000W hub motor, so there is 10inch e-scooter wheel.
Enclosed you will find another test "QS V3 205 50H 72V3000W Spoke Motor 1029.9RPM Test.pdf".
P.S.: It is test for spoke motor without wheel.

Best Regards

Vito, that second test has even higher no-load current (5.320a) lower efficiency and lower max torque. Doesnt seem right if you are using the same hubmotor without wheel.
I think you should do do all the tests and update your first post with the info so all newcomers can see it easily.

 

[QSMOTOR]

Vito, that second test has even higher no-load current (5.320a) lower efficiency and lower max torque. Doesnt seem right if you are using the same hubmotor without wheel.
I think you should do do all the tests and update your first post with the info so all newcomers can see it easily.

Vito: Thank you for your advise, I shared what I we could provide so far.
For further test, I will keep an eye on the no-load current. And update the first post in near further.

Best Regards

 

[John in CR]

For torque per amp, could you please advise how to calculate it?

The torque constant, Kt, in Nm/amp = 9.5478 / Kv in rpm/volt. This is of course below the point where the stator starts to go into saturation, but IMHO one should never approach stator saturation because it drives heat too high and efficiency too low. What this tells us is that motors wound for the same Kv produce the same torque per amp of phase current. That's why winding resistance is so important, since we can look at heat generated in the copper using Watts of heat = current squared times phase-to-phase resistance.

No-load current (phase and battery current will be the same at that end of the curve) is low enough that it creates negligible heat in the copper, so no-load current times the voltage gives us heat generated in the stator and magnets (iron losses), along with some air resistance load, and those losses vary with rpm. With no load-current at 2 different rpm, then Miles can plug it into his Motor Spreadsheet, which splits the iron losses between hysteresis and eddy currents (each varies differently with rpm.

As a vendor this level of detail can be used to clearly demonstrate the difference between the older model 273mm stator motors, and the ones I've heard rumors about that have significantly fewer poles in the same size stator. It may not be understood by the vast majority of customers, but that is changing here on ES.

 

[cwah]

Vito,

Would you be able to sell a kit with sine wave controller and motor with 135-140mm dropout to reach 70km/h on either 48v or 72v?

I need decent speed but also very good torque as I have some hills to climb.

Thank you

Vito: We could provide motor with sine wave controller (e.g. Sabvoton Controller SVMC072100).
Here is the link of controller for reference.
http://www.sabvoton.com/product/72v-4kw-brushless-motor-controller.html#.VWuufiOQvSw

For dropout of motor, we could only make it above 150mm (include 150mm) for 70KPH, and we could to make it 72V.

Best Regardfs

Thanks for your answer. I know Sabvoton controller but they feel a bit big. I need a controller of 1 kg max and motor of 10kg max. Top speed around 60-70km/h.

Any way I could have that?

Thank you