Search found 13504 matches

by John in CR
Jun 22 2019 7:49pm
Forum: Motor Technology
Topic: Hubmonster teardown
Replies: 26
Views: 1362

Re: Hubmonster teardown

Getting them apart is relatively easy with a 3 jaw puller. Going back together is the more difficult part due to the strong magnets, small air gap, and wide stator, and the stator always gets pulled against the magnets on one side and can bind up on the way into the shell. If staying sealed a bit of...
by John in CR
Jun 21 2019 7:42pm
Forum: Motor Technology
Topic: Hubmonster teardown
Replies: 26
Views: 1362

Re: Hubmonster teardown

These run virtually silent with trap controllers, so why worry about going FOC, especially since you can build your own high voltage controllers? It would be nice to know if they'll work with FOC, since I worry some that there could be some interference between the 2 sets of "fields". Regarding conv...
by John in CR
Jun 21 2019 10:40am
Forum: Motor Technology
Topic: Hubmonster teardown
Replies: 26
Views: 1362

Re: Hubmonster teardown

That's a MidMonster, and probably wound to a Kv of 14rpm/v. Why are you taking these motors apart? Nothing good can come of it. They are long out of production and can't be purchased anywhere. Like I said before, the only reason to disassemble them is to modify for cooling. How about you stop making...
by John in CR
Jun 16 2019 3:31pm
Forum: Items for Sale - New
Topic: PV NextGen Controller FOC compact 150v 22kw Max - $499
Replies: 105
Views: 3723

Re: PV NextGen Controller FOC compact 150v 22kw Max - $499

I had a 24 FET last year from PV. Don't really see what was so fantastic about it and the app. It was only semi-stable with the bluetooth, the settings took a frustrating 10 minutes to set as the slider bars were too sensitive. No other way of input at that time. *Pick*, damn, it got to be 88V, *Pi...
by John in CR
Jun 16 2019 3:20pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: 50cc Scooter conversion
Replies: 38
Views: 1212

Re: 50cc Scooter conversion

If I installed a controller where air flow is so limited, I'd put a fan or two to ensure the controller gets enough air flow for cooling. With it so protected from the elements like yours, I'd also put a fan mounted in the rear controller plate and hole in the front plate (to draw air through the c...
by John in CR
Jun 16 2019 3:17pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: 50cc Scooter conversion
Replies: 38
Views: 1212

Re: 50cc Scooter conversion

If I installed a controller where air flow is so limited, I'd put a fan or two to ensure the controller gets enough air flow for cooling.
by John in CR
Jun 16 2019 3:07pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Build Options
Replies: 13
Views: 405

Re: Build Options

MOER EDIT: Just thought of an example. Say a car battery is 12v 100ah. Starter motors are usually only rated at around 1 to 2kw, battery has 1.2kwh. In theory the starter should be able to crank over for more than half an hour but in reality it would be lucky to get more than 5 continuous minutes b...
by John in CR
Jun 13 2019 9:18am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Some help with ebikes
Replies: 3
Views: 292

Re: Some help with ebikes

How are the roads you'll be riding on? I ask because the light weight tubing quality is suspect on those generic type bikes, which are built for quite low speed use in China. The tiny drum brakes on the front are very suspect too. You've got plenty of battery space, so look for cheap (just not lead)...
by John in CR
Jun 10 2019 5:56pm
Forum: E-Bike General Discussion
Topic: [!Bling!] Wheel lighting
Replies: 14
Views: 452

Re: [!Bling!] Wheel lighting

Thanks for the topic to remind me about these. I was always impressed with the demo video of Monkey Lights, which use POV (persistence of vision) to make the whole wheel light up while spinning. I especially liked the programmability and would love to ride down the road at night with my wheels looki...
by John in CR
Jun 10 2019 5:39pm
Forum: E-Bike General Discussion
Topic: old motors inefficient?
Replies: 12
Views: 427

Re: old motors inefficient?

It wasn't very efficient the day they put the covers on at the factory.
by John in CR
Jun 08 2019 10:34am
Forum: E-Bike General Discussion
Topic: Illegal bike confiscation possibilities by police not up to date on newer laws
Replies: 67
Views: 1659

Re: Illegal bike confiscation possibilities by police not up to date on newer laws

You guys should move to a civilized country. Here the law is simple, so simple that the police actually know it, and they actually focus their efforts where they are more needed. Because it is a mountainous country, significant power ratings of motors are required for truly useful electric transport...
by John in CR
Jun 07 2019 4:17am
Forum: E-Scooter and Motorcycle General Discussion
Topic: The Easy way to mount a tire to a hub motor
Replies: 11
Views: 505

Re: The Easy way to mount a tire to a hub motor

i just take it to a tire shop and give them 10 bucks. takes them less then 3 minutes for a full swap. i gave up doing it myself, especially with reenforced rear tires its bascially trying to wrangle a concrete post. +1 but here it only costs $3...so definitely a no-brainer, though I may have to try...
by John in CR
Apr 30 2019 8:49pm
Forum: Motor Technology
Topic: High Voltage versus High Current
Replies: 13
Views: 2369

Re: High Voltage versus High Current

Resistive losses are comparatively small to whatever portion of your energy isn't going toward propulsion. What is the efficiency of the motor, under heavy load? 70%? The other 30% is dissipated as heat regardless of the volt / amp proportion. If your resistive losses are a significant fraction of ...
by John in CR
Apr 30 2019 8:30pm
Forum: Items for Sale - Used
Topic: SOLD - 3kw DD motor on 19" moped rim
Replies: 12
Views: 930

Re: 3kw mxus clone 19" moped - 325$

There's no such thing as a mxus clone. That's like saying I'm selling the generic form of Walmart aspirin. :mrgreen:
by John in CR
Apr 29 2019 5:06pm
Forum: Items for Sale - New
Topic: PV NextGen Controller FOC compact 150v 22kw Max - $499
Replies: 105
Views: 3723

Re: PV NextGen Controller FOC compact 150v 22kw Max - $499

What motors has this been tested on? Any low inductance high Kv hubbies?
by John in CR
Apr 28 2019 2:19am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Denzel 72v 4-spd Gearbox Build DB17
Replies: 54
Views: 2536

Re: Denzel 72v 4-spd Gearbox Build DB17

Instead of spacers between the hub and sprocket, I think it would be easier to do it with washers on the axle. Then just dish the wheel some at the end to center the tire after you get proper sprocket alignment. It looks like dishing will be needed anyway. Something I've been wondering about is how ...
by John in CR
Apr 28 2019 1:49am
Forum: Motor Technology
Topic: How many Amps can this 3500W rated QS hub motor actually take? (build planning)
Replies: 20
Views: 647

Re: How many Amps can this 3500W rated QS hub motor actually take? (build planning)

I hope you replaced those original phase wires. That cracked insulation could quickly lead to burning up a controller, and the crack on that blue wire makes all of the original suspect. It's always best to do it all right the first time. There's no better transportation that an absolutely reliable E...
by John in CR
Apr 26 2019 6:47pm
Forum: Motor Technology
Topic: High Voltage versus High Current
Replies: 13
Views: 2369

Re: High Voltage versus High Current

While watts are watts, with a given motor you will absolutely not get the same results with 10V at 120A as you would with 120V at 10A. The voltage and current limits of a motor depend upon it's construction and how it is wound. It is generally best to run a given motor at the highest voltage it was ...
by John in CR
Apr 26 2019 5:48am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Buell Fuell Flow motorcycle
Replies: 18
Views: 757

Re: Buell Fuell Flow motorcycle

100kph is just 62mph. Apparently though you live in Texas you've never been to Houston or Dallas, where you better be able to maintain a higher cruising speed than that if you want to be safe. Going slower than traffic simply isn't the safest way to ride on two wheels.
by John in CR
Apr 24 2019 9:06am
Forum: Motor Technology
Topic: Hubmonster teardown
Replies: 26
Views: 1362

Re: Hubmonster teardown

Looks like a really well designed hubmotor! Im impressed! If you hunt around, you'll eventually come across an old scooter with one. That's how I got both of mine. Or you can just buy one from John in CR. However you get one, it's a compelling hub motor. I sent one to LFP a few years ago. He just h...
by John in CR
Apr 23 2019 6:12pm
Forum: Motor Technology
Topic: Hubmonster teardown
Replies: 26
Views: 1362

Re: Hubmonster teardown

60mm is the most powerful and fastest with a Kv of just over 18. The lesser version are wound slower (so higher resistance) to offset the lowering of Kv to offset the narrower stator. No need to open...measure phase-to-phase resistance and Kv to know what you have. While 3 jaw pullers make getting t...
by John in CR
Apr 23 2019 2:44am
Forum: Motor Technology
Topic: Hubmonster teardown
Replies: 26
Views: 1362

Re: Hubmonster teardown

The only valid reason to pull the stator on one is to do cooling mods on the shell. The important stuff inside was all shared previously. How wide was the stator?...probably the largest if that's for the R Martin, but there were actually 3 different widths offered, and it's impossible to tell by the...
by John in CR
Apr 23 2019 2:23am
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 1347
Views: 61904

Re: la Nina rears her ugly head

Shorts and t-shirt weather every day. Lows 60-65 highs 70-80 depending on cloud cover or sun. Last year was kinda sucky with wetter than normal, but this year is shaping up to be more typical, so if it does rain it's in the afternoon with dry roads by commuting home time. In the tropics in the mount...
by John in CR
Apr 22 2019 5:28pm
Forum: E-Bike Reviews & Testing
Topic: Cycle Analyst V3 preview and first beta release
Replies: 4470
Views: 670170

Re: Cycle Analyst V3 preview and first beta release

If I try the current throttle through the CA, once I get it dialed in is there any risk with a very high power rig? I'd hate to be out riding on wet roads especially and have the throttle suddenly turn into a pass-through throttle mode. I use Zombiess Throttle Tamers now to slow the throttle ramp up...
by John in CR
Apr 20 2019 5:50pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Buell Fuell Flow motorcycle
Replies: 18
Views: 757

Re: Buell Fuell Flow motorcycle

35kw with a hubbie that has flat smooth side covers will be a fail in real world use. The engineers obviously didn't learn much in their thermodynamics class. That's one thing QS got mostly right with their side covers on the 273 motors, though I would have gone further to increase surface area both...