Search found 1485 matches

by Hummina Shadeeba
Oct 12 2019 12:48pm
Forum: E-Bike General Discussion
Topic: "gravity bike" turned to ebike?
Replies: 6
Views: 191

Re: "gravity bike" turned to ebike?

No fairings n pretty aero. Haven’t seen an e version yet. Cheaper than an ebike!
@sleepy_tired that shows how much wind is a factor: guy riding pro speeds and he’s probably not even in shape.
by Hummina Shadeeba
Oct 10 2019 10:25pm
Forum: E-Bike General Discussion
Topic: "gravity bike" turned to ebike?
Replies: 6
Views: 191

Re: "gravity bike" turned to ebike?

The whale looks comfy. As well as the second pic.
by Hummina Shadeeba
Oct 10 2019 7:00pm
Forum: E-Bike General Discussion
Topic: "gravity bike" turned to ebike?
Replies: 6
Views: 191

"gravity bike" turned to ebike?

they seem perfect. possibly comfortable. hugely more efficient going fast with im guessing half the frontal area.
mls-gravity-bike-13.jpg
mls-gravity-bike-13.jpg (77.86 KiB) Viewed 164 times
yasujiro-08.jpg
yasujiro-08.jpg (174.96 KiB) Viewed 164 times
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maxresdefault.jpg (63.81 KiB) Viewed 164 times
a skate truck on the back of the whale with a 20" wheel in its mouth would be great.
by Hummina Shadeeba
Sep 29 2019 11:04am
Forum: E-Bike General Discussion
Topic: what's the best nipples to use when rebuilding a hub motor?
Replies: 14
Views: 297

Re: what's the best nipples to use when rebuilding a hub motor?

I've heard of either brass or aluminum. Aluminum are weak.
by Hummina Shadeeba
Sep 29 2019 11:01am
Forum: Battery Technology
Topic: What charger to use for 12S Li-Ion.?
Replies: 15
Views: 375

Re: What charger to use for 12S Li-Ion.?

Think u would just need a bulk power supply since u have a bms. Meanwell has a bunch of options and more reliable. Without a fan is nice and so is adjustability
by Hummina Shadeeba
Sep 27 2019 6:05pm
Forum: Motor Technology
Topic: magnets held without glue?
Replies: 16
Views: 444

Re: magnets held without glue?

WIN_20190927_16_09_25_Pro.jpg WIN_20190927_16_09_35_Pro.jpg look how little room there is here. ive done them closer. how much of a loss from eddy currents or hysteresis could be happening? I somehow concluded years ago the losses even if the windings were even pressed against the steel wall would ...
by Hummina Shadeeba
Sep 27 2019 11:27am
Forum: Motor Technology
Topic: magnets held without glue?
Replies: 16
Views: 444

Re: magnets held without glue?

Makes sense if u could fit the long magnet, but then if u can fit the longer magnet why not put a longer stator as well.

On the hunt for design help in earnest.
by Hummina Shadeeba
Sep 27 2019 11:00am
Forum: Motor Technology
Topic: Looking for someone who can run motor design software
Replies: 0
Views: 98

Looking for someone who can run motor design software

I'm looking for someone I could pay or trade for motor design tutoring Recently I've come to want to get a new stator made with 15 teeth paired with the 14 magnets as it shows very low cogging torque and would coast well. In simulations on motorsolve the only way I've found to have a 15 tooth stator...
by Hummina Shadeeba
Sep 27 2019 1:20am
Forum: E-Bike General Discussion
Topic: two way throttle? (thumb or twist)
Replies: 14
Views: 343

Re: two way throttle? (thumb or twist)

I still cant find a throttle that's also a brake. anyone have an idea? it could even be a wi nunchuck or something. id rather a thumb slider or knob anyway.
by Hummina Shadeeba
Sep 26 2019 2:22pm
Forum: E-Bike General Discussion
Topic: two way throttle? (thumb or twist)
Replies: 14
Views: 343

Re: two way throttle? (thumb or twist)

All the diy built bikes are using mechanical braking and no regen? Rediculous.
by Hummina Shadeeba
Sep 25 2019 10:40pm
Forum: E-Bike General Discussion
Topic: two way throttle? (thumb or twist)
Replies: 14
Views: 343

two way throttle? (thumb or twist)

other than number 15 in the below link is there a two way throttle? http://www.freeenergystore.com/evhubmotors.html This is meant to be mounted on the handlebar of a luge, so you can control speed without taking either hand off of the bar (so you can hold on for dear life). The ideal solution I've c...
by Hummina Shadeeba
Sep 25 2019 1:41am
Forum: Motor Technology
Topic: magnets held without glue?
Replies: 16
Views: 444

Re: magnets held without glue?

disturbing as almost all the motors I know have the magnets the same length as the stator.
by Hummina Shadeeba
Sep 24 2019 2:55pm
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2098
Views: 366128

Re: Definitive Tests on the Heating and Cooling of Hub Motors

An open motor has a great ability to be cooled with a passive or active fan as you guys did. And a motor case with little air shows to transfer heat better to the case. How much heat could be transferred to the case through radiant heating if an ideal black lining were on the magnets and all in the ...
by Hummina Shadeeba
Sep 23 2019 8:09pm
Forum: Motor Technology
Topic: magnets held without glue?
Replies: 16
Views: 444

Re: magnets held without glue?

Alu will be fine but a solid piece of mild steel not so much, I see u want exceptional high rpm rotor the way to this would be make the magnets weight less by having high strength and good balance. I see the magnets have to be longer than they need to be so there more mass and cost there has to be ...
by Hummina Shadeeba
Sep 23 2019 3:03pm
Forum: Motor Technology
Topic: magnets held without glue?
Replies: 16
Views: 444

Re: magnets held without glue?

Since IPM motors puts the magnets in the steel it’s somewhat similar to your question but then the steel is laminated. If you’re at a reasonable distance from the coil fields it’ll work with a metal keeper ring without creating excessive losses but i think having a steel keeper ring would short out...
by Hummina Shadeeba
Sep 22 2019 10:00pm
Forum: Motor Technology
Topic: magnets held without glue?
Replies: 16
Views: 444

Re: magnets held without glue?

why you say high rpm?
by Hummina Shadeeba
Sep 22 2019 4:02pm
Forum: Motor Technology
Topic: magnets held without glue?
Replies: 16
Views: 444

Re: magnets held without glue?

Any iron In the motor needs to be laminated a big block of iron will get hot, Problem being some magnets will attract to their position while others will oppose and be flung out so we have to secure them in place be it with glues or tounge and groove etc. But is it IN the motor where it would be ex...
by Hummina Shadeeba
Sep 22 2019 11:29am
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2098
Views: 366128

Re: Definitive Tests on the Heating and Cooling of Hub Motors

What would be the breakdown of heat leaving the coils from a sealed motor? Conductive transfer- the stator thermal conductivity sucks being electrical steel which is likely as bad thermally as electrically conductive as typical, with layers of epoxy as well. Convective transfer- I've seen fans in a ...
by Hummina Shadeeba
Sep 20 2019 8:22pm
Forum: Motor Technology
Topic: magnets held without glue?
Replies: 16
Views: 444

magnets held without glue?

what motors do it like this without glue? Capture.JPG ive seen it with aluminum but seems mechanically sketchy and was thinking of trying it with a mild steel ring. if in steel would the ring mess with the magnetic circuit or better direct it? im guessing it would help and maybe could shape the stee...
by Hummina Shadeeba
Sep 20 2019 7:07pm
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2098
Views: 366128

Re: Definitive Tests on the Heating and Cooling of Hub Motors

how much of the heat from the motor could be removed as radiant with black magnet plating and painted motor case. but there's no black just a dark grey at least.
by Hummina Shadeeba
Sep 20 2019 9:52am
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2098
Views: 366128

Re: Definitive Tests on the Heating and Cooling of Hub Motors

Sorry for kidnapping the post, but does anyone remember where you could get these 3D printed files from? I remember having seen it on endless sphere, originally I guess from the russian forum but 1. don´t speak russian 2. can´t remember from where exactly. I have a 3D printer now and want to test i...
by Hummina Shadeeba
Sep 18 2019 12:45am
Forum: Motor Technology
Topic: Motor Design Software
Replies: 8
Views: 1036

Re: Motor Design Software

I'd just pay Miles $100 for his advice, or...check out what the hotrodders are breaking over in the power board section. Many here find out what works by overloading several different types of available motors, and see what works, and what breaks (The Lotus method of design?). "Stand-up E-scooters ...
by Hummina Shadeeba
Sep 10 2019 1:47pm
Forum: Stand-up E-scooters and E-skateboards
Topic: what you think of these motors?!
Replies: 14
Views: 799

Re: what you think of these motors?!

https://www.kickstarter.com/projects/1755906511/hummie-hub-motors?ref=nav_search&result=project&term=hummie made it. now to get that other stator done as well as many other things. thanks endless-sphere community for the education and motivation! may the e-revolution continue till its full potential.
by Hummina Shadeeba
Sep 10 2019 1:43pm
Forum: Motor Technology
Topic: lowest cogging torque with best winding factor.
Replies: 12
Views: 583

Re: lowest cogging torque with best winding factor.

im in the works of making a powder core to confirm it can be balanced and will work as well as hoped. I read it can be and looking at the drawing I can imagine winding it with transits across the stator instead of the whole phase being wound on 5 teeth beside each other. I read it can have a better ...
by Hummina Shadeeba
Aug 26 2019 11:46am
Forum: Motor Technology
Topic: lowest cogging torque with best winding factor.
Replies: 12
Views: 583

Re: lowest cogging torque with best winding factor.

But 15slot's still imbalanced for the forces? Might be balanced electrically, it's not the same thing. I really like the separated tooth winding, always wondered why it's not done like that. Simple,easy to wind, high fill factor, less risk for shorts. I think some flux is lost in the divisions but ...