Search found 156 matches

by kiwifiat
Nov 19 2019 4:49pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 1144
Views: 80641

Re: Tesla Model 3

Arlo1 wrote:
Nov 11 2019 12:46pm

Drag race was confirmed to be FAKE! There is even a screen shot of where the Model S screen shows "Range Mode"
and Top gear admitted to using numbers from a Model S that was 2 years old!
No surprises there, as a petrol head from way back I have always considered Top Gear a comedy show.
by kiwifiat
Nov 19 2019 4:43pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 832
Views: 48573

Re: APL's DIY axial-flux motor

Looking good. Where will the phase wires and hall sensor leads exit?
by kiwifiat
Nov 17 2019 3:23am
Forum: Motor Technology
Topic: More than3 phases
Replies: 9
Views: 793

Re: More than3 phases

Phase_7_motor_specs.PNG Fisher & Paykel makes 7-phase motors. Falco makes 5-phase motors. Somewhere around here there is a thread that has large six-phase motors, which allows the option of running it on two common 3-phase motors. F&P phase 7 is a marketing term, motor specs from the phase 7 manual...
by kiwifiat
Nov 01 2019 9:02pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 832
Views: 48573

Re: APL's DIY axial-flux motor

Well I haven't seen any research suggesting that, and I've looked at a lot. I'm not saying that it isn't true, but the greater percentage of axial's out there are double rotor designs, or single rotor double stator. If there was much of an advantage to the one sided single rotor design, then all th...
by kiwifiat
Oct 31 2019 7:51pm
Forum: Motor Technology
Topic: Sensorless From Standstill (SFS) explained
Replies: 24
Views: 1714

Re: Sensorless From Standstill (SFS) explained

Brilliant as usual and a very generous move on your behalf.

Let us hope that someone can port this sensorless method to a cheap STM32 Arm chip so we mortals can benefit.
by kiwifiat
Oct 31 2019 7:32pm
Forum: E-Vehicles General Discussion
Topic: QSmotor/SiAecosys/Taizhou CT-22 Programming. 1 of 8
Replies: 23
Views: 1421

Re: QSmotor/SiAecosys/Taizhou CT-22 Programming. 1 of 8

Well, I finally got a cryptic response from the vendor: 157Hz -60km/h In spite of his pithy belated message shown in its entirely above, I'm convinced that he is in error: in my case I believe the second number should represent mph not km/h! Explanation below. Let's take his two suggested values of...
by kiwifiat
Oct 03 2019 3:57pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Suzuki GSX-R e899 K2
Replies: 377
Views: 50619

Re: Suzuki GSX-R e899 K2

That would mean that multiplied with the 7.94 gear reduction of the Leaf Drive train it puts out 3183Nm of torque to the wheel. :shock: That can't be correct? Sure it can. Arlo's motor made 302.3 hp. Convert that to metric watts. You say the motor only makes 50Nm. Based on your assertion calculate ...
by kiwifiat
Oct 01 2019 11:27pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Suzuki GSX-R e899 K2
Replies: 377
Views: 50619

Re: Suzuki GSX-R e899 K2

madin88 wrote:
Oct 01 2019 11:43am
SlowCo wrote:
Sep 30 2019 7:02am
So 401Nm/7.94 (gearbox reduction)= 50.5Nm from the motor.
I think the 400Nm must have been from the motor.
Yes of course it is 400Nm from the motor, the factory Gen1 leaf makes 280Nm. A puny e-bike hub motor makes more than 50Nm.
by kiwifiat
Sep 11 2019 4:01pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 832
Views: 48573

Re: APL's DIY axial-flux motor

There is a massive amount of published research on axial flux motors. One of the more important design parameters regardless of the size of the motor is the ratio of the internal radius to external radius of the stator ring, that is Ri/Ro. A normalized plot of torque production shows a theoretical m...
by kiwifiat
Aug 03 2019 8:55pm
Forum: Motor Technology
Topic: Programming APT AE96600 controller from QSmotor
Replies: 37
Views: 797

Re: Inside look at new 50h QSmotor V4 8000W 13" hub motor

Ok then. Perhaps this is a case of "my bad". Maybe I learned something, maybe not... OTOH, the "conventional wisdom" regarding what this curve actually means (as documented) doesn’t make sense to me, as I'm sure it doesn't to many others. No worries, the suggestion changes from QSmotor works and th...
by kiwifiat
Jul 20 2019 9:19pm
Forum: Motor Technology
Topic: Inside look at new 50h QSmotor V4 8000W 13" hub motor
Replies: 37
Views: 2800

Re: Inside look at new 50h QSmotor V4 8000W 13" hub motor

All that extra copper length and resistance. It's got distributed winding, how can it be worth it? In theory there's less harmonics and eddy losses, higher winding factor but it must be possible to improve a lot with a concentrated winding.. It does have concentrated wingings, maybe take a closer l...
by kiwifiat
Jul 19 2019 8:35pm
Forum: Motor Technology
Topic: Ampera/Volt inverter with Lebowski brain
Replies: 57
Views: 3087

Re: Ampera/Volt inverter with Lebowski brain

It has been done by some guys in the Ukraine I think. A video on YT showing an Ampera/Volt inverter running a Nissan Leaf motor in a Peugeot van. There are a couple of videos showing the inverter, it is hard to be certain but it looks like they are driving the 6 half bridges in closest pairs ie 1 an...
by kiwifiat
Jul 05 2019 7:56pm
Forum: Motor Technology
Topic: Sevcon error
Replies: 7
Views: 472

Re: Sevcon error

0x4DC3 error is " Battery voltage has dropped below critical level". I would investigate that as a priority.

The others are top mosfet short circuit on all three phases, that is motor phase to Bat+. Following Fechter's advice will determine if that is the case. Let us know how you get on.
by kiwifiat
Jun 28 2019 11:31pm
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 201
Views: 20940

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

Thanks to Whereswally606 who sent me two blown boards from which I was able to scavenge almost enough parts to repair Coles blown BobC board. A big heads up to anyone using BobC's board and following the build instructions, there is a typographical error where it is suggested that the board can be t...
by kiwifiat
Jun 28 2019 11:08pm
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 201
Views: 20940

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

Animalector wrote:
May 25 2019 2:41am
I'm doing that as well with my design (but I'm getting a part from Digi-Key) one day I'll get around to finishing it and actually building one up

Andy
Your version looks very professional, it would be nice to see a lot of them in use.
by kiwifiat
May 31 2019 11:49pm
Forum: Motor Technology
Topic: Sanity check: outrunner with large no-load current, low inductance
Replies: 13
Views: 831

Re: Sanity check: outrunner with large no-load current, low inductance

What controller are you using or recommending that can supply the 611Amps DC required to generate 22kw at 90% eff driven at 40v? That is 2.4kw of heat, how long is a 4kg motor going to take before it turns into a demagnetized paper weight. I wouldn't, i recommended half the kv or half the volts and...
by kiwifiat
May 28 2019 7:31pm
Forum: Motor Technology
Topic: Sanity check: outrunner with large no-load current, low inductance
Replies: 13
Views: 831

Re: Sanity check: outrunner with large no-load current, low inductance

Does your 120/90 motor have sufficient torque to maybe gear it down and run it slower? Eddy current losses are proportional to the square of the frequency. +1 yes, running this motor to 6500rpm unloaded would use 1kw as would producing about 40Nm (that it can do), so loaded to that level is fully m...
by kiwifiat
May 24 2019 8:49pm
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 201
Views: 20940

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

Hey guys. This has been playing on my mind a while. I dont think the circuit for the 80v to 15v is anywhere near as robust as required. With that said i bought an 80v to 15v circuit on alibaba to off load this job from the brain board. I will reiterate i have very limited time to help but i will se...
by kiwifiat
May 15 2019 2:07pm
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 201
Views: 20940

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

No trouble, thank you for all you've done already! I've contacted Lebowski, but haven't heard back, yet. Kiwi, if you want a shot at it, I'm happy to send your way. I think we'll have to get Lebowski involved somehow, since it'll need a new dspic, but no need to have him do it all. I'll pm you my a...
by kiwifiat
May 08 2019 8:53pm
Forum: Motor Technology
Topic: Ampera/Volt inverter with Lebowski brain
Replies: 57
Views: 3087

Re: Ampera/Volt inverter with Lebowski brain

OK i tried to measure leaf motor ohm resistance. I used 30V and 10A as a reference. Result was 110.5mV. I tried all phase wires variations. Therefore if i use ohm law.... and get 0,01105ohm = 110.5mohm Then i divide this to get one legs worth of 55.25mohm! Would that be correct? I dont have more po...
by kiwifiat
May 06 2019 7:14pm
Forum: Motor Technology
Topic: Ampera/Volt inverter with Lebowski brain
Replies: 57
Views: 3087

Re: Ampera/Volt inverter with Lebowski brain

OK i tried to measure leaf motor ohm resistance. I used 30V and 10A as a reference. Result was 110.5mV. I tried all phase wires variations. Therefore if i use ohm law.... and get 0,01105ohm = 110.5mohm Then i divide this to get one legs worth of 55.25mohm! Would that be correct? I dont have more po...
by kiwifiat
May 03 2019 5:31pm
Forum: Motor Technology
Topic: Bionx controller replacement
Replies: 9
Views: 851

Re: Bionx controller replacement

Now that I have the motor open (easy to do with a gear puller), I need help identifying some wires. What are the two fine wires that go from "J5 GAGE" on the controller (first image) to the center of the rotor where they disappear at the rotor under black sealant (third picture)? What are the three...
by kiwifiat
May 03 2019 1:20pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science
Replies: 52
Views: 6396

Re: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science

Google and bing were for some reason very aggressively crawling the site- I'm currently trying to get it back, should be back online in a few days. Regarding open sourcing this stuff, I'm not sure. I'll be graduating from grad school in about a year, and was thinking of turning this all into a comp...
by kiwifiat
May 02 2019 2:03am
Forum: Motor Technology
Topic: Ampera/Volt inverter with Lebowski brain
Replies: 57
Views: 3087

Re: Ampera/Volt inverter with Lebowski brain

Deadtime distortion makes the resistor measurement very unreliable (but does not affect the inductor measurement much). So more deadtime, more wrong value. It is better to override this value by hand, typical value to aim for is R = L/X, with X roughly 1e-3 (all motor seem to have time constants in...
by kiwifiat
May 01 2019 3:59pm
Forum: Motor Technology
Topic: Ampera/Volt inverter with Lebowski brain
Replies: 57
Views: 3087

Re: Ampera/Volt inverter with Lebowski brain

Great news! What gear are you using in the RX8 and how does the overall reduction ratio compare to the Leaf? Top speed on 200V? The real mystery is why your controller was giving you a reading of only 6.66 mOhms.