Search found 49 matches

by everythingisawave
Apr 16 2021 6:00pm
Forum: Large EV General Discussion
Topic: Destruction Derby Car Build
Replies: 12
Views: 508

Re: Destruction Derby Car Build

Would definitely like to see this on YouTube.
by everythingisawave
Apr 16 2021 10:17am
Forum: EScooters/EMotorcycles
Topic: how to program a sevcon gen4
Replies: 344
Views: 95613

Re: how to program a sevcon gen4

Hi everythingisawave, I believe that the only things that changed between my weird (kind-of) circular graph and the one I recently posted were the firmware on my controller and the order of my sin-cos wires. I had determined the correct color association, but then plugged them into pins 35/21 in th...
by everythingisawave
Apr 16 2021 10:14am
Forum: Motor Technology
Topic: looking for advice on how to control this 12kw etorque motor for light hybrid, suggestions and ideas.
Replies: 12
Views: 553

Re: looking for advice on how to control this 12kw etorque motor for light hybrid, suggestions and ideas.

Hey, I just noticed what looks like a 3x Tamagawa resolver there. I'm not familiar with the Lebowski controller, maybe it can excite and demodulate that but you may need to double-check. I'm pretty sure that Sevcon Dragon 8 can operate these. Not sure about other lower end controllers like Curtis e...
by everythingisawave
Apr 16 2021 5:42am
Forum: EScooters/EMotorcycles
Topic: how to program a sevcon gen4
Replies: 344
Views: 95613

Re: how to program a sevcon gen4

we really need to make a single (Read only) topic strictly on how to operate and commission a motor on a sevcon. there is plenty of experience here but its quite spread out over the forum. prehaps add some google drive links to a collection of DCF's and other files that might be of use. no need to ...
by everythingisawave
Apr 16 2021 2:16am
Forum: EScooters/EMotorcycles
Topic: how to program a sevcon gen4
Replies: 344
Views: 95613

Re: how to program a sevcon gen4

I used the procedure outlined in one of the Sevcon manuals to determine the phase order of the motor we're using and which wire was sine and which was cosine. Once it was hooked up I followed the directions in another post on this forum and ran the encoder commision script. After graphing my voltag...
by everythingisawave
Apr 15 2021 2:12pm
Forum: EScooters/EMotorcycles
Topic: how to program a sevcon gen4
Replies: 344
Views: 95613

Re: how to program a sevcon gen4

Hi everyone, I am super excited to say that I have the 1302 spinning up successfully with the Sevcon Gen4!!! Turns out that there was a single parameter (minimum capacitor precharge voltage) that does not show up in the helper window in DVT 1.0. Once I fixed this value (and used the motor phase ord...
by everythingisawave
Apr 15 2021 11:44am
Forum: Motor Technology
Topic: Yamaha develops 496-horsepower motor for electric hypercars
Replies: 26
Views: 1050

Re: Yamaha develops 496-horsepower motor for electric hypercars

Yamaha provides motors to other OEMS and for racing as well, so I could see this as one of their test cases for that.
by everythingisawave
Apr 11 2021 12:30pm
Forum: Large EV General Discussion
Topic: 4x4 LSV using hub motors?
Replies: 8
Views: 1832

Re: 4x4 LSV using hub motors?

Sounds like a fun project. It is probably a good idea to have some kind of interlock to disable driving when charging is happening, as well as a maintenance plug that de-energizes the system manually. Also, moving the main fuse closer to the battery output is advisable, so that any kind of fault can...
by everythingisawave
Apr 11 2021 12:17pm
Forum: E-Vehicles General Discussion
Topic: High Power power supply for testing EVs motors controllers without battery pack
Replies: 3
Views: 512

Re: High Power power supply for testing EVs motors controllers without battery pack

IMHO efficiency mapping can be done more quickly if you automate and sync your data logging. It makes it even easier if you automate your motor command routines. I assume you are using a dyno setup, in which case if you can connect the two inverters back to back then the power supply only needs to s...
by everythingisawave
Apr 11 2021 2:15am
Forum: Motor Technology
Topic: Electric motor - what voltage?
Replies: 31
Views: 1034

Re: Electric motor - what voltage?

Well i am hoping i am putting this thread corretly now. i got a lot of batteries over that i wanna do something fun with. got an old bike at home with a broken engine etc, been sitting in my garage for 10+ years. (it is a derbi gpr nude 50cc). I might want to try and put an electric motor on it and...
by everythingisawave
Apr 08 2021 5:55pm
Forum: EScooters/EMotorcycles
Topic: how to program a sevcon gen4
Replies: 344
Views: 95613

Re: how to program a sevcon gen4

The contactor I am using is a 12-24V contactor (Kilovac EV200 I believe). It had a built-in economizer which was causing issues back when I first installed it a few weeks ago. So I took it apart and removed the circuit board so now the wires just go straight to the coil. My pull-in voltage is set t...
by everythingisawave
Apr 08 2021 2:33pm
Forum: EScooters/EMotorcycles
Topic: how to program a sevcon gen4
Replies: 344
Views: 95613

Re: how to program a sevcon gen4

I recall that the precharge system is sometimes finicky--did you check the pre-charge settings window? If the relay is not closing then the conditions for closure aren't being met, or the relay may not be operable by the Sevcon--I think it doesn't like PWM controlled relay economizers, like Gigavac...
by everythingisawave
Apr 08 2021 2:03pm
Forum: EScooters/EMotorcycles
Topic: Looking for featherweight geared hubmotors, >10kW
Replies: 35
Views: 1529

Re: Looking for featherweight geared hubmotors, >10kW

The problem you're having (torque vs watts vs size vs rpm) has been discussed in some detail around here before, but I couldn't find the threads in a minute's search. If I run across one later I'll link it for you. Basically, the problem is watts = torque x rpm, and it takes a certain amount of phy...
by everythingisawave
Apr 08 2021 12:49pm
Forum: EScooters/EMotorcycles
Topic: Looking for featherweight geared hubmotors, >10kW
Replies: 35
Views: 1529

Re: Looking for featherweight geared hubmotors, >10kW

I wouldn't rule out using multiple motors on the same shaft to get the desired power output. It's the torque that's the limiting factor. For reasons which I don't fully understand-- could be physical, could be economic-- there are no lightweight, high-efficiency, high-torque, low-power motors on th...
by everythingisawave
Apr 08 2021 12:44pm
Forum: EScooters/EMotorcycles
Topic: how to program a sevcon gen4
Replies: 344
Views: 95613

Re: how to program a sevcon gen4

I recall that the precharge system is sometimes finicky--did you check the pre-charge settings window? If the relay is not closing then the conditions for closure aren't being met, or the relay may not be operable by the Sevcon--I think it doesn't like PWM controlled relay economizers, like Gigavac ...
by everythingisawave
Apr 08 2021 12:18pm
Forum: Motor Technology
Topic: Stator/magnet swept area
Replies: 8
Views: 366

Re: Stator/magnet swept area

I can't remember the exact equations, but I recall that rough estimations for comparison of machines can be done by making some starting assumptions about maximum current density and airgap flux density assuming that things have been optimized to make best use of the material, then from there it is ...
by everythingisawave
Apr 08 2021 4:20am
Forum: Motor Technology
Topic: Axial Flux Reluctance motor, pondering DIY layout
Replies: 7
Views: 300

Re: Axial Flux Reluctance motor, pondering DIY layout

Are we talking switched reluctance, or synchronous reluctance?
by everythingisawave
Apr 07 2021 11:45am
Forum: Motor Technology
Topic: Axial Flux Reluctance motor, pondering DIY layout
Replies: 7
Views: 300

Re: Axial Flux Reluctance motor, pondering DIY layout

Sounds like an interesting project, will stay tuned! I remember Mitsuba was trying these on their EV Kart racers a few years ago, but not axial flux. The controller is kind of different with more phase connections, because the SR motor can be driven in a unipolar fashion. Surprised and interested to...
by everythingisawave
Apr 07 2021 5:30am
Forum: Alternative Energy
Topic: Inverter recommendations? 48V sine wave, no grid tie
Replies: 27
Views: 3911

Re: Inverter recommendations? 48V sine wave, no grid tie

I think that a lot of older fridges and a/c units didn't have an inverter, so the problems you mention with inductive loading could lead to derating of portable inverters needing to supply reactive power. Newer units might work better? I've seen some spot coolers on the market that consume less than...
by everythingisawave
Apr 07 2021 4:26am
Forum: Motor Technology
Topic: True FOC: definition and examples
Replies: 113
Views: 7890

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. Yes, good point. This is what is happening. When explaining to students I often tell them that a...
by everythingisawave
Apr 07 2021 1:47am
Forum: Battery Technology
Topic: Could this be quite the bargain?
Replies: 5
Views: 256

Re: Could this be quite the bargain?

Are there balancing leads?
by everythingisawave
Apr 06 2021 1:28pm
Forum: EScooters/EMotorcycles
Topic: how to program a sevcon gen4
Replies: 344
Views: 95613

Re: how to program a sevcon gen4

Would be useful to see the encoder settings page, and if there are any errors. You might also need to do that calibration step when the inverter is in forward mode. However if it is not rotating at all I would advise to check your connections first. Also, regardless of alignment, you should read sta...
by everythingisawave
Apr 06 2021 9:25am
Forum: Motor Technology
Topic: True FOC: definition and examples
Replies: 113
Views: 7890

Re: True FOC: definition and examples

The FOC has no awareness of timing. It takes the angle for timing from the halls and/or observer. FOC and timing/phase are independent. FOC operates on two orthogonal vectors, id and iq, and since they are orthogonal they do not influence each other. If your timing is wrong, the FOC loop will not k...
by everythingisawave
Apr 06 2021 7:59am
Forum: Motor Technology
Topic: New ground-up ESC - MESC_FOC_ESC
Replies: 162
Views: 8726

Re: New ground-up ESC - MESC_FOC_ESC

https://raw.githubusercontent.com/davidmolony/MESC_FOC_ESC/Rearrange_Vin/V0.4%20board%20bottom.jpg https://raw.githubusercontent.com/davidmolony/MESC_FOC_ESC/Rearrange_Vin/V0.4%20board%20top.jpg Massive board rearrangement since Zombies noticing that the board resistance is probably an issue. Board...