Tongxin 260rpm anyone have?

[Dadplus2]

I am wondering if anyone has one of these motors they wish to sell. I have built a little bike see this thread..

It works really well but tops out around 14/15mph so I would like to try the faster spinning motor. Thanks in advance.

 

[jerrysimon]

I have a few but I need them for spares

These people list and sell them, but you will need to be prepared to purchase and get them direct from China, with all the associtiated risks and communication problems.

Regards

Jerry

 

[amigafan2003]

I'd be interested in trying out a 260 rpm motor. Maybe we could organise some kind of group buy?

 

[jerrysimon]

I am not sure it would be advisable to use a Tongxin 260RPM motor in any wheel larger than 20".

Regards

Jerry

 

[amigafan2003]

I am not sure it would be advisable to use a Tongxin 260RPM motor in any wheel larger than 20".

Regards

Jerry

Probably not advisable but I do like to experiment

It's not adviseable to run a Tongxin on 44v lipo at 17a either ;-P

 

[Dadplus2]

Looks like a minimum order of 100 from the Outrider link.
What's wrong with putting it on a 26" wheel is it a speed/torque issue?

 

[jerrysimon]

It's not adviseable to run a Tongxin on 44v lipo at 17a either ;-P

My 12s A123 are not much below that fully charged at 43.2v and I been running it for 3000 miles and over two years. Is that fully charged ?

These motors can be fragile and don't take to being over volted or stressed well. I say not to put it in a larger rim as I assume (maybe mistakenly) that it will be trying to turn the wheel at a slower RPM than it is wound for and thus would stress. Given that this motor is really for lite assistance, especially on hills, can't you just pedal faster of you want to ? If you want a speed machine probably better to go for one of the other more powerfull/robust geared hub motors.

For me I want small, light, stealthy/quiet, low current draw and lite assistance. The Tongxin suits this requirement perfectly.

Looks like a minimum order of 100 from the Outrider link.

You can convince them, if you ask nicely, to buy in less than multiples of 100 if you say you want to buy some samples before committing to a larger order.

Regards

Jerry

 

[Scottyf]

You can put it in whatever wheel you like but the larger the diameter at a fixed Volt rpm will mean less torque and assistance it will offer.

But it will offer a good 20mph speed. So long as you kept the amp's down it will be ok. but you will have to pedal.

 

[amigafan2003]

My 12s A123 are not much below that fully charged at 43.2v and I been running it for 3000 miles and over two years. Is that fully charged ?

Nope - 50.4v fully charged. I'm going to try 15s of lipo on it at some point - that's 63v fully charged.

But it will offer a good 20mph speed. So long as you kept the amp's down it will be ok. but you will have to pedal.

My 190rpm Tongxin in a 700cc wheel does 20mph unassisted on 44v lipo.

 

[Scottyf]

Indeed but @ 44v thats will mean its rpm would be increased to 232rpm.
Which is why you get 20mph.

My bpm is would for 250rpm @ 36v (10s),
(12s)at 44v its 305rpm (24mph)
(15s)at 55v its 381rpm (30mph)
(18s)at 66v its 458rpm (35mph+)


You can run the Tongxin at those higher voltages but you will need to drop the amp's in order not to kill it.

 

[jerrysimon]

amigafan2003 I would say then that you are definately pushing it to its limits

Regards

Jerry

 

[Dadplus2]

That's interesting so more volts do equal more RPM even on a hub rated at 190rpm. I am currently running a max of 36V which tops out at 15pmh

 

[Scottyf]

The rated values are there to allow you to understand how that motor is wound and what its operating level is.

Is the 190rpm @36v would be for 15mph in a 700c wheel.
If you keep the available power the same but change the wheel size. Say went to a 20inch wheel. The electric motor would need to be wound differently in order to achieve the same speed.

How an electric motor is wound changes the volts for speed, amps for torque trade off in a linear fashion.
Providing the magnets and stators and copper fill in volume is the same.