Search found 1856 matches

by flat tire
May 31 2020 12:33am
Forum: E-Bike General Discussion
Topic: Flux weakening and a qs205
Replies: 2
Views: 31

Re: Flux weakening and a qs205

More flux weakening will get things hotter more quickly which can fry your motor. Keep an eye on the temperature, and add cooling if necessary.
by flat tire
May 30 2020 1:56am
Forum: E-Scooter and Motorcycle General Discussion
Topic: New builder, some quick questions for the experienced
Replies: 7
Views: 120

Re: New builder, some quick questions for the experienced

With your questions in mind, if you want a road legal electric motorcycle, then buy a Zero. You could get one for like $200 a month. If you can't afford that you don't want to be messing with a road legal anything.
by flat tire
May 29 2020 7:36pm
Forum: Battery Technology
Topic: Lipo hybrid systems
Replies: 6
Views: 117

Re: Lipo hybrid systems

If you can afford appreciable solar panels, mounts, and the rest of the system it shouldn't be much of a problem to amass the kind of lithium bank that can put out more power than your house / home workshop needs even with low C-rate cells. LiFePO4 drops almost twice as much resting voltage to disch...
by flat tire
May 29 2020 7:28pm
Forum: E-Bike Non-hub Motor Drives
Topic: GNG / CYC X1 Pro 3000w
Replies: 534
Views: 76057

Re: GNG / CYC X1 Pro 3000w

I guess it's the extra phase current you have. I haven't seen any of that wear with the stock controller. Yes. The phase current is basically uncontrolled it says like 300 amps. Even though it engages smoothly, there is a CRAPTON of torque available during the short plateau. It's actually excessive...
by flat tire
May 28 2020 5:22pm
Forum: Motor Technology
Topic: 5 Lines of Code to spin BLDC?!? On Youtube.
Replies: 5
Views: 192

Re: 5 Lines of Code to spin BLDC?!? On Youtube.

Dude, for real? Lines of code are meaningless unless this is machine language. You could just use one line Motor.spin(forward);

See???
by flat tire
May 28 2020 5:16pm
Forum: Vendor Relations Corner
Topic: EM3ev vs Luna Batteries and Kits
Replies: 35
Views: 3045

Re: EM3ev vs Luna Batteries and Kits

Yes, mister flattie :wink: gossip every day and worry, Acid, poor thing. Lol, what does that mean? I had a ridiculous ordeal with Luna and the people I spoke to on the phone weren't sober. Recreational drugs are great but probably not for people trying to be professional at work. To clarify, I don'...
by flat tire
May 28 2020 5:09pm
Forum: E-Bike Non-hub Motor Drives
Topic: GNG / CYC X1 Pro 3000w
Replies: 534
Views: 76057

Re: GNG / CYC X1 Pro 3000w

n2mb wrote:
May 27 2020 6:11am
How much power are you running?
Peak power is only around 3kw. But drivetrain stress is determined not so much by power, but by torque and how fast that torque comes on.
by flat tire
May 27 2020 2:14am
Forum: Battery Technology
Topic: Lipo hybrid systems
Replies: 6
Views: 117

Re: Lipo hybrid systems

If you're making an off grid system you're better off just using a larger battery to handle your discharge requirements. Or, a chemistry like LTO that combines very high discharge with great safety and lifespan at the cost of weight. Paralleling different chemistries does work within the voltage ove...
by flat tire
May 27 2020 2:07am
Forum: E-Bike Non-hub Motor Drives
Topic: GNG / CYC X1 Pro 3000w
Replies: 534
Views: 76057

Re: GNG / CYC X1 Pro 3000w

Sadly a RC controller is still the most reliable fastest response controller available for this drive. It is more reliable than the mechanical hardware. My RC esc has uncontrolled phase current, and the latest hardened 219H 11T sprocket deforms and wears extremely quickly even though the controller ...
by flat tire
May 27 2020 1:58am
Forum: E-Bike General Discussion
Topic: Wheelies
Replies: 33
Views: 2577

Re: Wheelies

To update this thread I stopped practicing after the last update due to lack of high power bicycles. But I started practice again and my wheelies are back. I'm using a low power bike that won't really power wheelie so I have to snap it up to balance right away or it won't work. I found out that earl...
by flat tire
Apr 15 2020 2:17pm
Forum: E-Bike General Discussion
Topic: speed traps
Replies: 16
Views: 456

Re: speed traps

Same way you deal with speed traps in a car. Figure out what they look like, where and when they show up, and pay attention! Countermeasures are optional.
by flat tire
Apr 15 2020 2:13pm
Forum: E-Bike Technical
Topic: BLDC Motor watercooling ; weird behaviour
Replies: 4
Views: 165

Re: BLDC Motor watercooling ; weird behaviour

The motor could have been damaged before you cooled it due to the high temperatures. It could have been damaged by the thermal shock of being dunked in cold water while very hot. And more more mundane stuff may have happened like water getting into the bearings, which probably aren't great immersed....
by flat tire
Apr 12 2020 3:20pm
Forum: E-Bike General Discussion
Topic: Got fried by Col. Sanders today. eBike vs pedal
Replies: 32
Views: 949

Re: Got fried by Col. Sanders today. eBike vs pedal

You got killed cuz you weren't prepared man. Go ride those twisty parts until you are hauling ass. And look into feeding that motor some more juice.
by flat tire
Apr 12 2020 3:12pm
Forum: Battery Technology
Topic: Pack Cycle Life - Can you help with the math?
Replies: 15
Views: 474

Re: Pack Cycle Life - Can you help with the math?

You need rc lipo not canned cells. Those hg2s will sag and heat like crazy if you use the discharge rates indicated. If they do 750 cycles the capacity will be severely degraded at the end. RC lipo pack of the same capacity on the other hand can handle those discharge rates without a sweat. You can ...
by flat tire
Apr 11 2020 2:43pm
Forum: E-Bike Technical
Topic: What am i doing wrong? Help please
Replies: 19
Views: 465

Re: What am i doing wrong? Help please

So at full charge of 42v, times 5ah is theoretically. Can we start banning members with thousands of posts who mislead people on fundamentals they should know? Absolutely inexcusable. The only correct voltage for discharge is nominal voltage or overall discharge voltage, taking into account the bat...
by flat tire
Apr 11 2020 4:20am
Forum: E-Bike Non-hub Motor Drives
Topic: Worn Out Lekkie Bling Ring??
Replies: 7
Views: 264

Re: Worn Out Lekkie Bling Ring??

Why do you think the chain is worn? Did you measure it?
by flat tire
Apr 11 2020 4:16am
Forum: E-Bike Technical
Topic: APD HV Pro
Replies: 7
Views: 254

Re: APD HV Pro

Haven't had enough time with the APD to tell. The HV160s haven't died yet either. I don't observe any special precautions with ESCs except to start off in an adequately low gear.
by flat tire
Apr 10 2020 8:52pm
Forum: Vendor Relations Corner
Topic: E.R.T \ Alan Hu nightmare.
Replies: 25
Views: 907

Re: E.R.T \ Alan Hu nightmare.

ASI isn't that bad to deal with. They will respond to support emails if you don't ask stupid questions. And their programming environment is far more noob friendly than sevcon's. There is documentation and everything in the app has tooltips. If I could figure out ASI surely many of you could too. Fo...
by flat tire
Apr 10 2020 3:55pm
Forum: Vendor Relations Corner
Topic: E.R.T \ Alan Hu nightmare.
Replies: 25
Views: 907

Re: E.R.T \ Alan Hu nightmare.

There are already a ton of threads on here about ERT and Alan's bullshit so I'd say his controllers are already pretty limited to the poorly informed. Unfortunately it's still not right to scam people even if they're ignorant or stupid, so the community really should step up and make sure everyone b...
by flat tire
Apr 10 2020 2:50pm
Forum: E-Bike Technical
Topic: APD HV Pro
Replies: 7
Views: 254

Re: APD HV Pro

This motor isn't driven by the drivetrain so it only "freewheels" for a very short amount of time after the throttle is closed while it spins down. Haven't blown any controllers so far, just a whole lot of motors. The APD controller doesn't get hot and pwm is adjustable up to 60khz. The build qualit...
by flat tire
Apr 10 2020 2:41pm
Forum: Vendor Relations Corner
Topic: E.R.T \ Alan Hu nightmare.
Replies: 25
Views: 907

Re: E.R.T \ Alan Hu nightmare.

How many posts about this scam of a "business" before the community does something? Oh right I guess the community can't really do anything, and users are too naive to do research before buying expensive controllers. In answer to your question OP there is nothing you can do besides a chargeback or w...
by flat tire
Apr 09 2020 10:34pm
Forum: Motor Technology
Topic: Surron Motor tuning with datalogs! FOC experts needed
Replies: 5
Views: 323

Re: Surron Motor tuning with datalogs! FOC experts needed

Looks normal. Is the motor supposed to do more at your voltage?
by flat tire
Apr 09 2020 9:29pm
Forum: Motor Technology
Topic: Mid-drive IPM motor options?
Replies: 42
Views: 1834

Re: Mid-drive IPM motor options?

IPM is way way better for flux weakening. This is well known and someone with 3000 posts should know.

The QS138 70H is supposed to be pretty good. I have one sitting around and it will definitely do big power but is rather heavy for a bicycle and in particular is quite wide.
by flat tire
Apr 09 2020 2:34pm
Forum: E-Bike Technical
Topic: What am i doing wrong? Help please
Replies: 19
Views: 465

Re: What am i doing wrong? Help please

Pics of the hub motor skateboard?

I agree you have barely any battery capacity. Sounds like you may need more.