Search found 253 matches

by hias9
Jul 15 2021 8:07pm
Forum: EBike Technical
Topic: Bafang G341 / M325 (BBS02 Successor?)
Replies: 2
Views: 113

Re: Bafang G341 / M325 (BBS02 Successor?)

This would not be a problem because I would not use the internal Bafang controller, but use a little ASI controller instead. I am only interested in the motor.
by hias9
Jul 15 2021 8:03pm
Forum: EBike General Discussion
Topic: Battery Triangle Bag - Carbon Frame
Replies: 19
Views: 416

Re: Battery Triangle Bag - Carbon Frame

I have some triangle bags and for crash protection I use a carbon fibre plate + closed cell foam.
But I am worried if the XC carbon frames can take the dymamic load of a 15-20lbs triangle battery when riding offroad (no hard offroad riding with this bike however)
by hias9
Jul 15 2021 4:35pm
Forum: EBike Technical
Topic: Bafang G341 / M325 (BBS02 Successor?)
Replies: 2
Views: 113

Bafang G341 / M325 (BBS02 Successor?)

Did anybody already have the oppurtunity to get his hands on the new Bafang G341 which is probably supposed to be the successor of the G340 (better known as BBS02).
I am curious if there are any changes inside.
by hias9
Jul 14 2021 8:24pm
Forum: EBike General Discussion
Topic: Battery Triangle Bag - Carbon Frame
Replies: 19
Views: 416

Re: Battery Triangle Bag - Carbon Frame

I would consider 30-40miles a short ride, so yes I need a battery of that size. When doing short rides (<50miles), I have another smaller triangle battery which I could use for the short rides to save weight. Is it possible to sit on the top tube of a carbon frame? If yes, I think a triangle battery...
by hias9
Jul 11 2021 8:06pm
Forum: Items for Sale - New
Topic: 45mm 3kW Motor (similar mxus 3k 3T) 135mm
Replies: 2
Views: 807

Re: 45mm 3kW Motor (similar mxus 3k 3T) 135mm

One motor still available. Price without shipping 205€
by hias9
Jul 07 2021 12:43pm
Forum: EBike General Discussion
Topic: Battery Triangle Bag - Carbon Frame
Replies: 19
Views: 416

Battery Triangle Bag - Carbon Frame

Does anybody have experience with using a heavy triangle battery (15-20lbs) inside the triangle of a carbon fibre MTB frame? I don’t have much experience with carbon fibre frames unfortunately. What I am afraid of it that the carbon tubes are not designed to handle the loads created by a heavy batte...
by hias9
Jul 03 2021 2:08pm
Forum: EBike Technical
Topic: Potting windings on a hub motor
Replies: 21
Views: 580

Re: Potting windings on a hub motor

It is the usual Chinese 3000W 45H with 23 pole pair design like mxus 3k for example, but with more copper.
Mxus also used 130 degrees wire for the DD motors by the way.
by hias9
Jul 01 2021 5:43pm
Forum: EBike Technical
Topic: Potting windings on a hub motor
Replies: 21
Views: 580

Re: Potting windings on a hub motor

I have calibrated the temp sensor with the controller. And yes, controller shows less than real on very high temperatures, but that’s already in the calculation. There should not be more than 6-7 degrees inaccuracy. Highest it ever was at the winding was about 145 degrees, but only for a very short ...
by hias9
Jul 01 2021 9:46am
Forum: EBike Technical
Topic: Potting windings on a hub motor
Replies: 21
Views: 580

Re: Potting windings on a hub motor

Yes, but according to spec sheets and wikipedia for winding wire the rating is max continous temperature.
Peak temperature would be higher.
by hias9
Jun 30 2021 1:25pm
Forum: EBike Technical
Topic: Potting windings on a hub motor
Replies: 21
Views: 580

Re: Potting windings on a hub motor

180deg rated winding wire is nothing special, there are lots of them. Just google it. I guess they used a 130 degrees rated winding wire which is the cheapest and told me incorrect information. The winding wires which use PAI as insulation material have an even higher rated temperature (210-240 Cels...
by hias9
Jun 30 2021 4:54am
Forum: EBike Technical
Topic: Potting windings on a hub motor
Replies: 21
Views: 580

Re: Potting windings on a hub motor

Getting some wire is not the problem, I meant if somebody offers a rewinding service for a reasonable price in Europe. As far as I know, the temperature rating of the winding wire (like W180 for example) is continous, not peak. Maybe not for the Chinese wire. If the hall sensors fail, no problem. I ...
by hias9
Jun 29 2021 3:00pm
Forum: EBike Technical
Topic: Potting windings on a hub motor
Replies: 21
Views: 580

Re: Potting windings on a hub motor

Lowering the temp would be a solution of course, but with this motor I was also testing how far I could go and I was worried more about the magnets which are rated 120 Celsius. Kv did not increase at all. Hall sensor are rated 150 degrees (no problems) and winding wire has a 180 degrees rating (whic...
by hias9
Jun 29 2021 6:05am
Forum: EBike Technical
Topic: Potting windings on a hub motor
Replies: 21
Views: 580

Re: Potting windings on a hub motor

The copper winding wire is rated 180 degrees Celsius continous according to the Chinese manufacturer and the temperature sensor on the windings (which I have calibrated with the controller, so there should not be more than 5 degres error) never saw more than 140 degrees Celsius. Did you already rewi...
by hias9
Jun 27 2021 11:26am
Forum: EBike Technical
Topic: Potting windings on a hub motor
Replies: 21
Views: 580

Re: Potting windings on a hub motor

Here are two pictures of a 3kw DD hub motor which I run up to 135 degrees Celsius. https://i.ibb.co/jfvDvxB/DSC-3592.jpg https://i.ibb.co/h93GWNn/DSC-3593.jpg Would thermal epoxy not help to spread the heat at the windings more equal and conduct heat better than the paper and wooden sticks? (I have ...
by hias9
Jun 27 2021 10:00am
Forum: EBike Technical
Topic: Potting windings on a hub motor
Replies: 21
Views: 580

Re: Potting windings on a hub motor

I am now planing to pot at least the end windings because I usually run the motor up to 135 degrees Celsius and on only a few wires the varnish is already black. So heating at the windings might not be equal everythere. Which potting epoxy should I use and are there any videos/pictures/instructions ...
by hias9
Jun 23 2021 4:34pm
Forum: EBike Technical
Topic: DD Motor Running Rough
Replies: 2
Views: 125

Re: DD Motor Running Rough

I used 120 degrees Celsius limit at the windings in the past. After that I gradually increased up to 135 degrees. I was worried more about the magnets (rated 120 degrees), but noticed no Kv change at all. Yesterday after opening the motor I removed all the wooden pieces (except near there hall senso...
by hias9
Jun 22 2021 4:42pm
Forum: EBike Technical
Topic: DD Motor Running Rough
Replies: 2
Views: 125

DD Motor Running Rough

Today I had rough running and higher than usual drag on my 3kw DD motor (with Statorade+Hubsinks). I push up to 20kw bursts through it and allow up to 135 degrees Celsius at the windings (thermal foldback starts at 110) and motor was close to 135 on this ride. However it is not the first time it has...
by hias9
Jun 16 2021 4:12am
Forum: EBike Technical
Topic: Thermally conductive Paint
Replies: 0
Views: 69

Thermally conductive Paint

I plan to paint the inside of my hub motor side cover black and glue a heatsink to the outside of the sidecover.
Are there any paints with good thermal conductivity?
by hias9
May 28 2021 8:30pm
Forum: EBike Technical
Topic: Method to tune Current Regulator of FOC Controller
Replies: 0
Views: 110

Method to tune Current Regulator of FOC Controller

I always determined Ki and Kp of the current regulator by trying.
Is there also a more professional approach to do this?
by hias9
May 16 2021 10:18am
Forum: EBike Technical
Topic: Potting windings on a hub motor
Replies: 21
Views: 580

Potting windings on a hub motor

Has anybody tried to pot the windings of a 3kw DD hub motor with thermally conductive epoxy/silicone? Was there a sigificant improvement in combination with Statorade+Hubsinks compared to Statorade+Hubsinks only? Obviously on a hub motor it is not possible to build a thermally conductive bridge to t...
by hias9
Apr 25 2021 10:29pm
Forum: EBike General Discussion
Topic: Bafang RM G310?
Replies: 9
Views: 598

Re: Bafang RM G310?

Ok, 25A phase limit on a 8T winding (or is it 10T 8.5Kv?) is very conservative.
Is there some ATF leaking or everything tight?
by hias9
Apr 25 2021 7:34pm
Forum: EBike General Discussion
Topic: Bafang RM G310?
Replies: 9
Views: 598

Re: Bafang RM G310?

@TDB: Did you manage to do 7000km with one set of gears? Did you add oil to it? I also limit to 350wheel-rpm, foldback at 90C, cutoff at 120C (but never been higher than 110C), temperature sensor added next to the speed sensor. Which winding version do you have and how many phase amps? My G310 is a ...
by hias9
Apr 25 2021 7:12pm
Forum: EBike Technical
Topic: BBS02 Improving Heat Dissipation
Replies: 10
Views: 429

Re: BBS02 Improving Heat Dissipation

I still don't get it why an external controller should be a bad idea on this motor. I am not planning to run more amps through it than stock, cooling should be way better than on an internal and I read a lot about controller failures with the stock controller probably due to overheating and high fai...
by hias9
Apr 25 2021 4:13pm
Forum: EBike Technical
Topic: BBS02 Improving Heat Dissipation
Replies: 10
Views: 429

Re: BBS02 Improving Heat Dissipation

Thank you for the replies. I am still waiting for the motor. I think I will definitely add thermal compound, but not sure if I will also do the heatsink mods. I got a BBSHD (with a BAC855) and I don't know about the RPM of the BBS02, but you want to make sure it runs at a higher RPM. When you put a ...
by hias9
Apr 20 2021 6:13am
Forum: EBike Technical
Topic: Bafang G310 geared hub - 11:1 reduction ratio!!!
Replies: 239
Views: 45306

Re: Bafang G310 geared hub - 11:1 reduction ratio!!!

12T and 13T seem to be "standard" for the G310. I think the faster windings are only available at Grin.

Take care with the phase amps on your 13T. 30A phase results in the same torque as 39A phase on a 10T. My planetary gears only survived about 200 miles running 30A phase on a 13T.