Search found 88 matches

by marka-ee
Apr 13 2021 5:09am
Forum: Large EV General Discussion
Topic: Nobe 3-wheel EV car
Replies: 12
Views: 226

Re: Nobe 3-wheel EV car

When they are so bashful of showing the price, me thinks it is a toy for the rich. I wish them luck competing against the $4000 EV cars from China. Those cars I can imagine regular folk driving to the shopping mall or the workplace. They have sold tens of thousands in the first few mo. of release. T...
by marka-ee
Apr 07 2021 3:34am
Forum: Motor Technology
Topic: True FOC: definition and examples
Replies: 110
Views: 6809

Re: True FOC: definition and examples

Forgive me for simplifying the FOC to just a 'timing' change, but where the code meets the mosfets, isn't that what is exactly happening? You start producing the sine wave a wee bit earlier that before. I was wondering though, do cheap KT controllers do any kind of timing advance at all to even in t...
by marka-ee
Apr 06 2021 4:21am
Forum: Motor Technology
Topic: True FOC: definition and examples
Replies: 110
Views: 6809

Re: True FOC: definition and examples

Yes, I guess. So is that really what the FOC is doing, just moving the hal timing a little to compensate for the current lag? Boiling it down to the simple here. Does the ultimate FOC implementation modify the shape of the sine wave being generated? The 'field weakening' still eludes me. Maybe field...
by marka-ee
Apr 06 2021 3:27am
Forum: Motor Technology
Topic: True FOC: definition and examples
Replies: 110
Views: 6809

Re: True FOC: definition and examples

Stepping back from all the fancy maths, I have a question or maybe proposal: If I had a motor mounted in a test stand dyno and drive it with a china KT sine wave controller could I see some FOC based results if I changed the timing of the hal sensor by a few degrees ? Maybe in other words: Does a 'p...
by marka-ee
Apr 04 2021 5:28am
Forum: Alternative Energy
Topic: Running a house on an e-motorcycle battery?
Replies: 63
Views: 1173

Re: Running a house on an e-motorcycle battery?

Hello John. I have similar laws here, they make it expensive to connect to the grid. I just do it on a small scale :) . I have a cheap China 500watt grid tie inverter that I have hooked up to 8 120 watt panels. It's hits 500 watts when the sunshine is good. You have to realize that the panel ratings...
by marka-ee
Mar 29 2021 3:30pm
Forum: EBike General Discussion
Topic: Solid tires?
Replies: 42
Views: 2143

Re: Solid tires?

On my scooter which always gets flats I decided to coat the inside of the tire with silicon sealer clear caulk. I figure it adds some extra distance before the intruder gets to the tube. So far so good. I also put Stans in the tube, but I have found that Stans seems to turn 'runny' after a while and...
by marka-ee
Mar 25 2021 5:46pm
Forum: EBike Technical
Topic: Arduino Nano Cycle Analyst (and other) companion TidBits
Replies: 60
Views: 1625

Re: Arduino Nano Cycle Analyst (and other) companion TidBits

Yes, that's what I meant at the end of my post. Have the display on the bars be just a display device. This would also help with the wiring as all the sensor wires and even throttle control wires would be kept close to the controller. The cost of these Arduinos , rounded off, is zero. The soldering ...
by marka-ee
Mar 25 2021 1:47pm
Forum: EBike Technical
Topic: Arduino Nano Cycle Analyst (and other) companion TidBits
Replies: 60
Views: 1625

Re: Arduino Nano Cycle Analyst (and other) companion TidBits

I'm 70% done with my Arduino bike display. Just software and calibration tuning now. Using a two line 16 character LCD. So here are some things to consider in making one of these. Speed sensing: I managed to use the hal signal from the motor on one of my bikes that has a direct drive motor. Things o...
by marka-ee
Mar 21 2021 11:44am
Forum: Bike Mechanical & Structural
Topic: 120v aluminum/cromo TIG welding on bike frames - possible?
Replies: 42
Views: 899

Re: 120v aluminum/cromo TIG welding on bike frames - possible?

I’ll probably get some flack for mentioning I’m using the multiplaz welder. It does need 220v for welding steel. There’s a circuit combiner that you can get. It combines two 110v separate circuits into the needed 220v. This is an option that I didn’t need. I couldn’t deal with tanks and the welding...
by marka-ee
Mar 18 2021 1:26pm
Forum: EBike Technical
Topic: Arduino Nano Cycle Analyst (and other) companion TidBits
Replies: 60
Views: 1625

Re: Arduino Nano Cycle Analyst (and other) companion TidBits

Update: Well. I seemed to fix the hal speed sensor noise issue by adding a 0.1 uf cap to ground from the hal signal. But now I seem to have lost my nice hal current sensor . :evil: :evil: :evil: I am not happy about that as I don't have spares laying around. I may take one from a semi-working contro...
by marka-ee
Mar 18 2021 11:06am
Forum: EBike Technical
Topic: Arduino Nano Cycle Analyst (and other) companion TidBits
Replies: 60
Views: 1625

Re: Arduino Nano Cycle Analyst (and other) companion TidBits

I'm working on my Arduino meter as well. I wired directly to the Promini unit ( similar to the nano, but smaller ). I did use a tiny perf board to hold some small auxiliary stuff like voltage divisor resistors. For now I'm displaying on a 20x2 LCD. I build a separate 'pod' to hold the hal current se...
by marka-ee
Mar 17 2021 5:06am
Forum: EV Business World
Topic: $4000 E car from Red China selling like hotcakes
Replies: 12
Views: 352

Re: $4000 E car from Red China selling like hotcakes

I have lost count of all the small EV offerings that have come and gone for various reasons,.. Gem, Sparrow, Aptera, etc,.. ... but generally lack of sales seems to be the common factor... ..not enough people want them ! But they do want them. The China $4000 one sold 50,000 in 6 months. The Gem,Sp...
by marka-ee
Mar 16 2021 6:31pm
Forum: EV Business World
Topic: $4000 E car from Red China selling like hotcakes
Replies: 12
Views: 352

Re: $4000 E car from Red China selling like hotcakes

You missed the Porsche and Lambo electric knockoffs posted in another thread. In the U.S. the NEV market isn't exactly hot, but I say that's because the offerings are the GEM, etc. Plus I think the 25mph limit is unrealistically low. You look at the roads they're allowed to drive on and it gets har...
by marka-ee
Mar 16 2021 1:18pm
Forum: EV Business World
Topic: $4000 E car from Red China selling like hotcakes
Replies: 12
Views: 352

Re: $4000 E car from Red China selling like hotcakes

Propaganda? How? I think these types of EV would sell well. City type of car for basic transportation. It has a small 15 Kw battery but fine for getting to work or a shopping run. The price is amazing if you ask me.
by marka-ee
Mar 16 2021 5:23am
Forum: EV Business World
Topic: $4000 E car from Red China selling like hotcakes
Replies: 12
Views: 352

$4000 E car from Red China selling like hotcakes

Saw a nice article on the $4000-$5000 electric cars selling very well in china, very popular with first time car buyers in the countryside. Folks, that's what many people in the western world pay for an electric bike! :confused: Now I'm sure it does not fit into the nanny state safety standards of t...
by marka-ee
Mar 14 2021 10:24am
Forum: Bike Mechanical & Structural
Topic: Square vs Round tubing : square easier?
Replies: 4
Views: 267

Square vs Round tubing : square easier?

I would like to do some frame mods and suspension fab. Obviously round tubing is way more common in bike construction, but I find it much harder to work with due to the joint copes. What are the structural implications I should consider in using square tubing?
by marka-ee
Mar 12 2021 6:14pm
Forum: EBike Technical
Topic: step down converter with LM2596
Replies: 5
Views: 151

Re: step down converter with LM2596

lm317hv , blunt instrument analogue, good for 60 v I think.
by marka-ee
Mar 11 2021 11:54am
Forum: Bike Mechanical & Structural
Topic: 120v aluminum/cromo TIG welding on bike frames - possible?
Replies: 42
Views: 899

Re: 120v aluminum/cromo TIG welding on bike frames - possible?

Alu needs way more heat ( amps from 110 socket ) than steel. It's also a lot harder to master, for example with steel you can see it turn red when getting hot. Alu does not change color it just melts and falls away if you are not on top of it. Also for steel you can get away with a DC tig welder but...
by marka-ee
Mar 08 2021 3:33pm
Forum: EBike Technical
Topic: Which Integrated Circuit (IC) Controls Low Voltage Cutoff/Protection (LVC/LVP)?
Replies: 3
Views: 134

Re: Which Integrated Circuit (IC) Controls Low Voltage Cutoff/Protection (LVC/LVP)?

I have KT controller also and would like to change LVC as well. I may be the cpu and one of it's analog inputs responsible for tracking the voltage. Even so, there should be a voltage divider for that somewhere.
by marka-ee
Mar 08 2021 2:46am
Forum: EBike Build Threads
Topic: Nazca Pioneer solar recumbent build
Replies: 72
Views: 2755

Re: Nazca Pioneer solar recumbent build

Good to see it on the road! The heel strike takes getting used to, after a while you learn to time the pedal position according to what direction you are turning. The motor makes everything so much easier. On the rear shock I am realizing that my 9c heavy hub motor is not ideal. The suspension somet...
by marka-ee
Mar 06 2021 9:00am
Forum: EBike Build Threads
Topic: Nazca Pioneer solar recumbent build
Replies: 72
Views: 2755

Re: Nazca Pioneer solar recumbent build

Two 85 watt panels and he gets about 70 watts from both, that's about what to expect. I wonder if you can swap in a better fet in the blue one ? No reason for it to get hot at those power levels.
by marka-ee
Mar 04 2021 10:57am
Forum: EBike Build Threads
Topic: Nazca Pioneer solar recumbent build
Replies: 72
Views: 2755

Re: Nazca Pioneer solar recumbent build

How do those bars work out? How do you mount and dismount from bike? I have the type that folds up and away and there is a hand adjustable screw to set the bar height while riding. I think they are the standard pioneer type. I also lift then on slow speed maneuvers now and then, it helps with me bal...
by marka-ee
Mar 01 2021 4:10pm
Forum: EBike Technical
Topic: Arduino Nano Cycle Analyst (and other) companion TidBits
Replies: 60
Views: 1625

sensing speed

For sensing speed or distance I am looking at using one of the hal signals from my 9C DD hub. I believe it has 50 or so motor poles so that would come out to about 300 Hz for roughly 50 kph. On the Arduino side that could trigger an interrupt routine that I would have simply increment a counter. Wou...
by marka-ee
Feb 24 2021 4:10pm
Forum: EBike Technical
Topic: Arduino Nano Cycle Analyst (and other) companion TidBits
Replies: 60
Views: 1625

Re: Arduino Nano Cycle Analyst (and other) companion bits and bobs

Do you think that the +5 or in my case +6 coming out of the throttle 3 pin connector from the KT controller has enough power to feed an Arduino ? That would be the easiest solution, to feed that into the Vin of the nano, that way voltage spikes would be somewhat controlled by the nano voltage regula...
by marka-ee
Feb 22 2021 3:11pm
Forum: EBike Build Threads
Topic: Nazca Pioneer solar recumbent build
Replies: 72
Views: 2755

Re: Nazca Pioneer solar recumbent build

My rear shifter cable broke a while ago but it doesn't matter, the chain never needs to leave the small sproket back there ;)