Search found 890 matches

by j bjork
Feb 04 2021 8:34am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Sevcon Gen4 troubles
Replies: 5
Views: 266

Re: Sevcon Gen4 troubles

I dont know the answer, but maybe you can find someting in one of the other sevcon threads?
Like this one:
https://endless-sphere.com/forums/viewt ... 10&t=36146

I think that there are a pretty long one in the aircraft section too.
by j bjork
Feb 02 2021 1:05am
Forum: E-Scooter and Motorcycle Build Threads
Topic: Yamaha YZF250F
Replies: 70
Views: 3583

Re: Yamaha YZF250F

c70r wrote:
Feb 01 2021 4:51pm
I saw somebody say that QS confirmed they won't be making the 180 90H, did you see it?
Where did you see that? They havent said anything to me.
by j bjork
Feb 01 2021 2:50pm
Forum: Motor Technology
Topic: BESC-G4
Replies: 4
Views: 530

Re: BESC-G4

looks interesting, subscribed :wink:
by j bjork
Feb 01 2021 2:44pm
Forum: E-Scooter and Motorcycle Build Threads
Topic: Yamaha YZF250F
Replies: 70
Views: 3583

Re: Yamaha YZF250F

Finally some progress, I got a motor :D https://i.imgur.com/SnIH8Ur.jpg Eh, not really.. But I have a model of a motor :lol: Haggan90 made quick progress when I gave him the go. Thanks a lot :thumb: I was trying to get it done locally first, and wasted a lot of time. Someone has a friend that can pr...
by j bjork
Feb 01 2021 2:33pm
Forum: Motor Technology
Topic: BESC - beefed up VESC motor controller for high power ebikes
Replies: 167
Views: 35656

Re: BESC - beefed up VESC motor controller for high power ebikes

Nice to see you are still active galp :)

Does everything on vesc work on this controller, like MTPA and master/slave configuration?
Have you made progress on the version 3?
by j bjork
Jan 31 2021 8:10am
Forum: Motor Technology
Topic: Split phases and run dual controllers?
Replies: 9
Views: 386

Re: Split phases and run dual controllers?

I should probably read those threads but isn’t it simply that an out of sync will allow one controller to short circuit through the other controllers fets? Means that it can never work as a concept other than by stroke of luck, for some time.. Well, that kind of sums it up. But it seems to be a lot...
by j bjork
Jan 30 2021 12:29pm
Forum: Motor Technology
Topic: Split phases and run dual controllers?
Replies: 9
Views: 386

Re: Split phases and run dual controllers?

An interesting thread on the subject of paralleling 2 controllers on the same windings:
https://endless-sphere.com/forums/viewt ... 30&t=91515

And another, there is a link in the first one:
https://endless-sphere.com/forums/viewt ... =2&t=75186
by j bjork
Jan 28 2021 2:27pm
Forum: Motor Technology
Topic: Split phases and run dual controllers?
Replies: 9
Views: 386

Re: Split phases and run dual controllers?

If I get this right he rode a motor with dual winds and dual controllers.
Still one blew when there was a sync issue?
https://endless-sphere.com/forums/viewt ... 91#p321635

I dont really understand why, if it looses sync it just turn off the output right?
Does it die from back emf?
by j bjork
Jan 26 2021 1:13pm
Forum: E-Vehicles General Discussion
Topic: Votol EM-100 & EM-150 controllers
Replies: 1367
Views: 146850

Re: Votol EM-100 & EM-150 controllers

Then you have a problem. For starters it dosent even reach your low protect value. Did you try no throttle and full throttle? Are you using a potetiometer throttle like domino or magura? In that case you probably need to add resitors in line with the + and - to get some offset. Otherwise your 0 thro...
by j bjork
Jan 26 2021 10:18am
Forum: E-Scooter and Motorcycle Build Threads
Topic: Yamaha YZF250F
Replies: 70
Views: 3583

Re: Yamaha YZF250F

c70r, thanks for the link, it was interesting :thumb: But I didnt see anything about vw in there? (I mean you said the seem to recommend GTE cells) larsb, Thanks. They hasent said anything about that, I will ask if I go that way. At the moment I am mostly considering 2x votol em200 96V or 2x PV vesc...
by j bjork
Jan 26 2021 9:02am
Forum: Motor Technology
Topic: Split phases and run dual controllers?
Replies: 9
Views: 386

Re: Split phases and run dual controllers?

I am thinking about another possibility that would be very simple if it would work..
How about just connecting 2 controllers paralell?

As long as they are somewhat in sync I guess it would be ok?
If they for some reason is not in sync it might end bad I suppose..

Anyone with thoughts or experiance?
by j bjork
Jan 26 2021 7:41am
Forum: E-Vehicles General Discussion
Topic: Votol EM-100 & EM-150 controllers
Replies: 1367
Views: 146850

Re: Votol EM-100 & EM-150 controllers

For me hall fault has always been throttle at least, but I have an older controller. What voltages do you get when you measure between signal and ground?
by j bjork
Jan 26 2021 7:07am
Forum: E-Scooter and Motorcycle Build Threads
Topic: KTM 200 exc goes electric
Replies: 215
Views: 31922

Re: KTM 200 exc goes electric

I dont have the same controller, I have SW 2,32 HW 1,13 I can save settings, as long as they are in range where there are limits. It seems like on these newer ones you do some adjustments on how the motor runs on the second value in sport mode flux-weakening. Maybe something in the second fw setting...
by j bjork
Jan 25 2021 11:59am
Forum: E-Scooter and Motorcycle Build Threads
Topic: Yamaha YZF250F
Replies: 70
Views: 3583

Re: Yamaha YZF250F

The golf cells are about 27x149x92mm, I think the passat cells are the same size. But the 92mm height is without connections so you will have to add at least 10mm. When calculating volume I think those measurements are more accurate. The leaf cells are so damn wide, I think I would only fit 2 of tho...
by j bjork
Jan 24 2021 11:21am
Forum: E-Scooter and Motorcycle Build Threads
Topic: Yamaha YZF250F
Replies: 70
Views: 3583

Re: Yamaha YZF250F

The modules are about 355x150x110mm. I would say it is difficult but not impossible to reconfigure them. The terminals are welded, but I think there are enough material to cut the bus bars in the middle and drill holes for a screw connection. It looks like the bus bars are aluminum, but I am not sur...
by j bjork
Jan 24 2021 7:28am
Forum: E-Scooter and Motorcycle Build Threads
Topic: Yamaha YZF250F
Replies: 70
Views: 3583

Re: Yamaha YZF250F

In the absence of a motor, that pretty much dictates where everything else goes I am pretty stuck. I got tired of trying to read up on controllers and had to do something else.. I set up some kind of test station for my batteries: https://i.imgur.com/qp6dYOn.jpg I used a 12v electric heater element ...
by j bjork
Jan 23 2021 12:06pm
Forum: Motor Technology
Topic: Why limit battery current in a controller?
Replies: 11
Views: 380

Re: Why limit battery current in a controller?

Well, that might be an answer. Or when controllers are sold in kits with hub motors they want higher phase amps to get good starting torque, but dont want the buyer to be able to go crazy with the battery amps and brake things. I am mostly interested in if those that have designed a controller, or h...
by j bjork
Jan 23 2021 8:30am
Forum: Items for Sale - New
Topic: PV NextGen FOC 130v 200/600A 25kw - $599, Watch Display
Replies: 266
Views: 32492

Re: PV NextGen FOC 130v 200/600A 25kw - $599, Watch Display

Any updates on the controller itself? How is the progress with the testing, is there still hw changes before it is ready to sell to the public? 2 of those would be interesting for my latest project if they are ready in a few months. Is it still 200bA and 400pA that you are testing? Is there a reason...
by j bjork
Jan 23 2021 8:12am
Forum: Motor Technology
Topic: Why limit battery current in a controller?
Replies: 11
Views: 380

Re: Why limit battery current in a controller?

What I wonder is why do the manufacturer choose to set this limit? In general there is the equation battery amps = duty cycle * phase amps. So especially at low speeds, where the BEMF is low, the phase amps are much higher than the battery current as it needs only low low duty cycles to generate hi...
by j bjork
Jan 23 2021 7:29am
Forum: E-Vehicles General Discussion
Topic: Votol EM-200 Controller
Replies: 56
Views: 7273

Re: Votol EM-200 Controller

QS seems to think the em200 is ok now, and sells it. They say the em300 still have problems and dont want to sell that.
No personal experience with either one of them though.
by j bjork
Jan 23 2021 6:24am
Forum: Motor Technology
Topic: Why limit battery current in a controller?
Replies: 11
Views: 380

Re: Why limit battery current in a controller?

Here is an example: https://ebikes.ca/tools/simulator.html?bopen=true&motor=MX4503&batt=cust_88_0.001_8&cont=cust_120_450_0.03_V&hp=0&cont_b=cust_500_450_0.03_V&motor_b=MX4503&batt_b=cust_88_0.001_8&hp_b=0 I just took the example controller in the post with the batter...
by j bjork
Jan 23 2021 6:08am
Forum: Motor Technology
Topic: Why limit battery current in a controller?
Replies: 11
Views: 380

Re: Why limit battery current in a controller?

When someone make a controller it has some hardware limits, lets say it has 24mosfets rated for 100V. The manufacturer decides that it can safely handle 88V and 450phaseA, so they set the overvoltage protection to 89V and max phase amp the user can set to 450. Then they decide to set the max battery...
by j bjork
Jan 22 2021 4:02pm
Forum: Motor Technology
Topic: I'm looking for developers/engineers interested in high current (+1kA) controller development
Replies: 13
Views: 1147

Re: I'm looking for developers/engineers interested in high current (+1kA) controller development

This sure is interesting, as others have pointed out there are not many options at higher currents and lower voltages. There are motors, but it seems there are almost no controllers except for sevcon. I think lebowskys way is partly interesting. It sounds to me that a bunch of 6 fet controllers woul...
by j bjork
Jan 22 2021 3:24pm
Forum: Motor Technology
Topic: Why limit battery current in a controller?
Replies: 11
Views: 380

Re: Why limit battery current in a controller?

That dosent give a reason for the controller to have a limit that you cant go over. That is a reason to have a limit that the user can decide. My question is why many controllers have a max battery amp limit that often is a lot lower than the max allowable phase amp. Is it protecting the controller ...
by j bjork
Jan 22 2021 3:11pm
Forum: Motor Technology
Topic: Why limit battery current in a controller?
Replies: 11
Views: 380

Why limit battery current in a controller?

Many controllers have a battery current limit that is maybe half of the phase current. I wonder why? From what I understand the only current that matters is the phase current, that is what stress the mosfets? Some controllers have a battery current limit close to the phase current limit, like nucula...