Search found 7898 matches

by Chalo
Jun 13 2021 6:22pm
Forum: EBike General Discussion
Topic: Chinese quality mtb hubs?
Replies: 23
Views: 250

Re: Chinese quality mtb hubs?

From looking at the pictures of the hub it seems like it might be drilled oversized. I know most of these hubs with the dual rotor mounts are normally labeled E bike hubs. They look like fairly ordinary 2.7mm hub holes. If they're less than 3.0mm, use 14-15ga spokes. If bigger, use 13-14ga or 13-15...
by Chalo
Jun 13 2021 12:34pm
Forum: Large EV General Discussion
Topic: Electric kart
Replies: 228
Views: 48157

Re: Electric kart

fluids downsides are added weight and complexity plus there's going to be some additional drag from an immersed rotor Drag at low speed means cavitation as speeds go higher. All the energy wasted as fluid drag in the motor turns into heat in the system you're trying to cool that way. There's a lot ...
by Chalo
Jun 13 2021 11:07am
Forum: EBike General Discussion
Topic: Fast/Slow winding - How to calc?
Replies: 11
Views: 208

Re: Fast/Slow winding - How to calc?

spinningmagnets wrote:
Jun 13 2021 10:09am
in the "non-hub" section, the thread stickie list has a link to a chart that spells out two formulas for calculating wheel-diameter to road-speed,
I use this:

https://www.4qd.co.uk/road-speed-calculator/

The reduction ratio for a hub motor is 1.
by Chalo
Jun 13 2021 11:05am
Forum: EBike General Discussion
Topic: Chinese quality mtb hubs?
Replies: 23
Views: 250

Re: Chinese quality mtb hubs?

Oh, right this is regular hub we're talking about and not a hub motor. Use 14-15 ga spokes, unless your hub is drilled oversized for some reason. The thinner the spoke, the more load the wheel can take without problems (and 14-15 ga is still easy to build with). 14-15ga double butted spokes are easi...
by Chalo
Jun 13 2021 9:31am
Forum: EBike General Discussion
Topic: Fast/Slow winding - How to calc?
Replies: 11
Views: 208

Re: Fast/Slow winding - How to calc?

6 rpm/V (thanks!) so what does mean? slow? fast? That's a fairly slow hub motor compared to most. The flip side of that is you have a comparatively high torque per amp. At 36 volts nominal, in a 24 inch wheel, the unloaded speed will be around 16 mph. The most efficient cruising speed will be about...
by Chalo
Jun 13 2021 8:38am
Forum: EBike General Discussion
Topic: Chinese quality mtb hubs?
Replies: 23
Views: 250

Re: Chinese quality mtb hubs?

Chalo do you recommend these spokes for my front wheel?? I’m aiming to make this wheel really strong. Well maybe minus the narrow hub flanges on this dual disk hub lol My rear hub motor build that you gave me advice on I used the same spokes 13/14ga single butted. https://ebikes.ca/spcust14b.html T...
by Chalo
Jun 12 2021 10:42pm
Forum: EBike General Discussion
Topic: Chinese quality mtb hubs?
Replies: 23
Views: 250

Re: Chinese quality mtb hubs?

Dual disc hubs usually have much narrower flange spacing than single disc or rim brake hubs, and thus make much weaker wheels.
by Chalo
Jun 12 2021 8:07pm
Forum: Stand-up EScooter/ESkateboards
Topic: EXTREMO - Scratch built 7kW billet frame scooter
Replies: 19
Views: 411

Re: EXTREMO - Scratch built 7kW billet frame scooter

Trust me that you won't be able to use 120A in the front motor. Amps are torque, and there's simply no way to stick down that much torque in the front unless you are going backwards.
by Chalo
Jun 12 2021 1:46am
Forum: EBike Build Threads
Topic: Eco moped
Replies: 2
Views: 89

Re: Eco moped

If the charger plugs into the bike rather than directly into the battery, then you likely have a problem with the electrical contacts between the battery and the bike. You'll need to remove the battery to have a look, though.
by Chalo
Jun 12 2021 1:37am
Forum: EBike Non-hub Motor Drives
Topic: Bafang BBS02 with torque sensor
Replies: 12
Views: 4836

Re: Bafang BBS02 with torque sensor

It is a real shame Bafang don't have a torque sensor option for the BBSHD. They have lost at least one customer. If Tongsheng can do it for a universal mid drive and have it ride so well you'd think Bafang could also do it. Is it a shame that the BBSHD doesn't allow your bike to fly into the air ov...
by Chalo
Jun 12 2021 12:37am
Forum: EBike General Discussion
Topic: Fast/Slow winding - How to calc?
Replies: 11
Views: 208

Re: Fast/Slow winding - How to calc?

Though I understand the slow vs fast winding in a hub motor concept, how do I go about calculating/determining that in a motor? The slow vs fast winding concept is relative -- you have to have two motors to compare. If they only sell one option, then.. well, you get what you get. Ultimately, it's a...
by Chalo
Jun 11 2021 11:58pm
Forum: EBike General Discussion
Topic: Help with battery size fitting for a merida big seven
Replies: 9
Views: 128

Re: Help with battery size fitting for a merida big seven

If you get a triangle battery or a rack battery, you may not have the same problem meeting your controller's current demand.

There's nothing especially wrong with Hailong battery cases, but they're not the only game in town.
by Chalo
Jun 11 2021 8:17pm
Forum: EBike General Discussion
Topic: Question Regarding Firms in China???
Replies: 5
Views: 155

Re: Question Regarding Firms in China???

However, these two firms have what I wish......primarily a powerful kit who laces fat wheel in 24" size. Any insights greatly appreciated. One wheel, or a batch of them for a production run? If it's a single wheel or two, buy the hub that meets your criteria and build it yourself, or have a lo...
by Chalo
Jun 11 2021 11:28am
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 86
Views: 6115

Re: what is cogging torque?

I can't say one way or the other what's happening magnetically inside the hub, but once it's vibrating things outside the hub, that energy mostly leaves the system. It's like hitting a bump in the road. You could decide hypothetically that the energy spent surmounting the bump on the front side is r...
by Chalo
Jun 11 2021 11:04am
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 86
Views: 6115

Re: what is cogging torque?

When you can feel or hear cogging torque, it's because some of that energy was transmitted outside of the system and therefore not conserved. Whether the energy is dissipated in your fingers as you turn the motor axle, your tires as you ride, or the groceries in your panniers as you bring home the b...
by Chalo
Jun 10 2021 8:14pm
Forum: Bike Mechanical & Structural
Topic: Whats wrong? Wheel build n00b
Replies: 4
Views: 143

Re: Whats wrong? Wheel build n00b

The holes in the rim you have are too tightly fitted to allow the nipples to come in line with the spokes. You can fix this in one of a couple of ways. Unfortunately, you will have to unlace the wheel. One way is to take a pencil and mark the direction each spoke leaves the rim (which direction it t...
by Chalo
Jun 10 2021 7:07pm
Forum: EBike General Discussion
Topic: Why do I now ride my ebike with light motorcycle gear?
Replies: 58
Views: 1135

Re: Why do I now ride my ebike with light motorcycle gear?

There's no net added safety from wearing a helmet, and whole population studies bear that out whenever they occur. Sources please for these "studies"? Here is a collection of a few dozen that suggest otherwise: https://www.rinehardtlawfirm.com/statistics-dont-lie-bicycle-helmets-save-live...
by Chalo
Jun 09 2021 6:31pm
Forum: EBike General Discussion
Topic: The ideal hubmotor
Replies: 16
Views: 474

Re: The ideal hubmotor

Now amongs the various ways to lock a hub motor stator, I do think that slotted / square axles are not that bad. It is the only clean way to clamp a motor using only the bike's dropouts; everything else would require either a torque arm bolted to the chainstay somewhere, or a special plate around t...
by Chalo
Jun 09 2021 11:31am
Forum: EBike General Discussion
Topic: The ideal hubmotor
Replies: 16
Views: 474

Re: The ideal hubmotor

integrated hub + 1500w is not possible. That motor would use the axle of the igh as main stator support, and easily dammage it at those power levels, since it's only slotted 10mm steel; not even 12mm like most chinese hub motors. Axle size is arbitrary, even in a gearhub. (See the Kindernay with a ...
by Chalo
Jun 09 2021 11:14am
Forum: EBike General Discussion
Topic: The ideal hubmotor
Replies: 16
Views: 474

Re: The ideal hubmotor

E-HP wrote:
Jun 08 2021 10:31pm
JackFlorey wrote:
Jun 08 2021 9:53pm
-Integrated gear hub with 7-8 speeds (i.e. similar to the TCDM IGH but with something like a Nexus)
-Rear wheel, compatible with cassettes
8 integrated, plus a cassette?
It's not completely loony to imagine separating motor gears from pedal gears. That would be one way to do it.
by Chalo
Jun 08 2021 9:02pm
Forum: EBike General Discussion
Topic: Why do I now ride my ebike with light motorcycle gear?
Replies: 58
Views: 1135

Re: Why do I now ride my ebike with light motorcycle gear?

Hey, there are control freaks and suggestible dingdongs everywhere. But not nearly as many in Copenhagen as what we're used to.

Image
by Chalo
Jun 08 2021 8:52pm
Forum: EBike General Discussion
Topic: Help decide between All-Axle and GMAC
Replies: 38
Views: 704

Re: Help decide between All-Axle and GMAC

I'd say 'all axle' motor all day, except it does not come in a rear motor configuration, which is the right place to have a motor on a majority of bikes. I wish it were true. The fact is that a wheel built on most hub motors is half a regular bike wheel, and the rear is where you need a good strong...
by Chalo
Jun 08 2021 11:06am
Forum: EScooter/EMotorcycle Build Threads
Topic: Electric Roadster
Replies: 142
Views: 8719

Re: Electric Roadster

Looking at your frame design versus common motorcycle designs.. i cannot identify any causes for this wobble off the top of my head. If I had to guess, I would bet on torsional flexibility between the headstock and swingarm pivot. Many motorcycles using frames of this layout have the motor as a str...
by Chalo
Jun 07 2021 5:36pm
Forum: EBike General Discussion
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 2003
Views: 259013

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

AdR wrote:
Jun 07 2021 5:04pm
Open to any and all suggestion to clueless newbies friendly controller
For the motor that's already on your bike? Show us the plug that connects it to the controller.