Search found 21 matches

by Bmr4life
Jul 13 2020 8:17pm
Forum: Motor Technology
Topic: My1020 / Kunray / YaLU 1000 - 2000W motor ?
Replies: 68
Views: 6818

Re: My1020 / Kunray / YaLU 1000 - 2000W motor ?

It appears so but that doesn't make any sense. That's why I want to try the motor with my Kelly controller. Flip a phase and the matching hall the motor will spin backwards and give you that power in forward rotation if it's the case. E.g. yellow to green phase and halls then blue to blue on both p...
by Bmr4life
Jul 13 2020 6:26pm
Forum: Motor Technology
Topic: My1020 / Kunray / YaLU 1000 - 2000W motor ?
Replies: 68
Views: 6818

Re: My1020 / Kunray / YaLU 1000 - 2000W motor ?

It appears so but that doesn't make any sense. That's why I want to try the motor with my Kelly controller.
by Bmr4life
Jul 13 2020 6:00pm
Forum: Motor Technology
Topic: My1020 / Kunray / YaLU 1000 - 2000W motor ?
Replies: 68
Views: 6818

Re: My1020 / Kunray / YaLU 1000 - 2000W motor ?

So is anyone this motor with a kelly controller? I'm trying to set my up via the auto identity and that appears to cycle just fine. But when I try to bench run the motor I get high speed stutters with the rpms shooting all over the place. Funny thing is it worked fine when I first hooked it up and t...
by Bmr4life
Jul 13 2020 5:56pm
Forum: Motor Technology
Topic: My1020 / Kunray / YaLU 1000 - 2000W motor ?
Replies: 68
Views: 6818

Re: My1020 / Kunray / YaLU 1000 - 2000W motor ?

This may be a dumb question but do these motors run better in one direction versus the other? This is motor only, ignoring controller settings. Thanks Equal torque and rpm in either direction, wouldn't want to ram it in reverse mind going flat out the sprocket will proberly spin on the motor shaft,...
by Bmr4life
Jul 13 2020 5:23pm
Forum: Motor Technology
Topic: My1020 / Kunray / YaLU 1000 - 2000W motor ?
Replies: 68
Views: 6818

Re: My1020 / Kunray / YaLU 1000 - 2000W motor ?

This may be a dumb question but do these motors run better in one direction versus the other? This is motor only, ignoring controller settings.

Thanks
by Bmr4life
Jan 03 2020 9:18pm
Forum: E-Bike General Discussion
Topic: Hub drive torque limitations. Steep hills while towing a child?
Replies: 38
Views: 2420

Re: Hub drive torque limitations. Steep hills while towing a child?

Thank you, that was very helpful. It's nice they have those kind of simulations for slopes.
by Bmr4life
Jan 03 2020 8:40pm
Forum: E-Bike General Discussion
Topic: Hub drive torque limitations. Steep hills while towing a child?
Replies: 38
Views: 2420

Re: Hub drive torque limitations. Steep hills while towing a child?

I just want to verify that they have the torque for steep hills while lacking the advantage of multiple gear ratios. What do you consider a steep hill. I think above 15% as steep, but depending on where people live, 7% may be steep. If the latter, then I think a hub motor would be fine. PS. Don't t...
by Bmr4life
Jan 03 2020 5:57pm
Forum: E-Bike General Discussion
Topic: Hub drive torque limitations. Steep hills while towing a child?
Replies: 38
Views: 2420

Re: Hub drive torque limitations. Steep hills while towing a child?

Yes the same motor can be rewound to **either** deliver more torque / amps / heat at low speed (start from stop, steep hills and/or more weight), **or** arrive at a higher top speed, which is a function of high voltage. To get both rather than compromising, you need gearing. And the former is very ...
by Bmr4life
Jan 03 2020 5:53pm
Forum: E-Bike General Discussion
Topic: Hub drive torque limitations. Steep hills while towing a child?
Replies: 38
Views: 2420

Re: Hub drive torque limitations. Steep hills while towing a child?

Huh, I always thought watts were watts with the only difference being high voltage means less amps with less heat and resistance. Watts are watts. But different motors are different at better things; one motor (with a low Kv rating) might do great on hills but have a low top speed, while another (w...
by Bmr4life
Jan 03 2020 4:44pm
Forum: E-Bike General Discussion
Topic: Hub drive torque limitations. Steep hills while towing a child?
Replies: 38
Views: 2420

Re: Hub drive torque limitations. Steep hills while towing a child?

Huh, I always thought watts were watts with the only difference being high voltage means less amps with less heat and resistance.
by Bmr4life
Jan 03 2020 4:23pm
Forum: E-Bike General Discussion
Topic: Hub drive torque limitations. Steep hills while towing a child?
Replies: 38
Views: 2420

Hub drive torque limitations. Steep hills while towing a child?

After building several electric gokarts ranging from 350w to 13kw I'm now looking into building an ebike. My fast kart weighs 200lbs, I can't ride any of my karts outside of my subdivision, and I'd like something that I can go out further and tow my daughter behind me. I'm looking at rear hub motors...
by Bmr4life
Sep 29 2019 12:31pm
Forum: Battery Technology
Topic: CellLog 8S alternatives? Coulometers?
Replies: 8
Views: 973

Re: CellLog 8S alternatives? Coulometers?

Do not get a cellmeter 8. I bought two from progressive RC and both are way off for individual cells. One is 0.04v at it's worst and the other is 0.06v.
by Bmr4life
Sep 26 2019 6:43pm
Forum: Battery Technology
Topic: Anyone dealt with Tech Direct Inc. LG Chem Modules
Replies: 25
Views: 3811

Re: Anyone dealt with Tech Direct Inc. LG Chem Modules

There is nothing you can do. You can't wait that long to file a claim. I also believe I bought bad batteries from Tech Direct. I bought their 20ah Panasonic Lithium batteries. One has completely failed and the others don't even reach 20ah. I bought 5 more from used cells greentecauto and they hit 24...
by Bmr4life
Sep 10 2019 2:42pm
Forum: Large EV General Discussion
Topic: For an electric kart, what is the relationship of torque and power?
Replies: 5
Views: 1867

Re: For an electric kart, what is the relationship of torque and power?

I also use the BMI speed calculator, it has been spot on for me as well. Once I know the gear ratio I'm going to use then I'll use it to get theoretical top speed. As for the controller, I'd have to use two since these are brushless motors. Also, I already have a large 400amp Kelly controller and a ...
by Bmr4life
Sep 10 2019 10:40am
Forum: Large EV General Discussion
Topic: For an electric kart, what is the relationship of torque and power?
Replies: 5
Views: 1867

Re: For an electric kart, what is the relationship of torque and power?

Thank you both. I've ordered the 60v versions of these motors and controllers so I've not over-volting as much. Plan is 18s, either lipos or hybrid batts.
by Bmr4life
Sep 10 2019 6:23am
Forum: Large EV General Discussion
Topic: For an electric kart, what is the relationship of torque and power?
Replies: 5
Views: 1867

For an electric kart, what is the relationship of torque and power?

So I've have some good luck with my Razor Dune Buggy adult conversion. The Chinese 48v brushless setup has been tested at up to ~68v and the controller was modified to push ~50 amps. It currently propels the 300lbs of kart and rider to 30mph while still having good torque for getting up hills. I'd l...
by Bmr4life
Aug 13 2019 10:30pm
Forum: Battery Technology
Topic: 30Ah 28s LiPo from 7s bricks
Replies: 35
Views: 2415

Re: 30Ah 28s LiPo from 7s bricks

Any more pics of progress?
by Bmr4life
May 31 2019 12:06pm
Forum: Large EV General Discussion
Topic: Industrial Motor gokart build
Replies: 55
Views: 11941

Re: Industrial Motor gokart build

How are your lipos holding up?
by Bmr4life
May 25 2019 12:21pm
Forum: Battery Technology
Topic: Anyone dealt with Tech Direct Inc. LG Chem Modules
Replies: 25
Views: 3811

Re: Anyone dealt with Tech Direct Inc. LG Chem Modules

Since the copper bars are accessible shouldn't it be possible for me to charge this as two separate 8s packs with my hobby charger? I'd add two sets of 8s balance leads and a charging connector to cells 1-8 and another charging connector to cells 9-16.
by Bmr4life
May 24 2019 9:53am
Forum: Motor Technology
Topic: Is this a proper Motor and ESC combo for my project?
Replies: 1
Views: 498

Is this a proper Motor and ESC combo for my project?

Running weight will be under 400lbs with rider. Goals are at least 25mph top speed with the ability to also climb a 20 degree slope (so not giving up all my torque for top speed). I was told I would need ~7KW to accomplish this which I'm fine with. For batteries, I will use 14 24AH lithium cells fro...