Search found 3233 matches

by Lebowski
Aug 20 2019 2:41am
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 575
Views: 88101

Re: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15

I don't remember being contacted by you Marcos... I was once contacted and told "we need you to this and that" which is a sure fire way for me not to be interested. Even at work I don't accept that type of commanding... C.... when I look at C I always have the feeling it is very inefficient. Lots of...
by Lebowski
Aug 19 2019 1:58am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 715
Views: 32824

Re: APL's DIY axial-flux motor

IMG_1971%20copy.jpg I would use this one. Reason being that the stator sees pure rotational force from each winding. If the green phase is active you get two torque vectors on opposite sides of the stator and no net displacement force. The two other ones, when only one phase is active, produce only...
by Lebowski
Aug 19 2019 12:59am
Forum: E-Bike Technical
Topic: The SB Cruiser: Amberwolf&Dogman's 2WD CargoTrike&DogCarrier
Replies: 962
Views: 118406

Re: The SB Cruiser: Amberwolf&Dogman's 2WD CargoTrike&DogCarrier

apparently this is a thing now in Holland:
cargobike.png
cargobike.png (400.19 KiB) Viewed 336 times
by Lebowski
Aug 18 2019 11:17am
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 575
Views: 88101

Re: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15

What would also be cool to test once is the sensorless from standstill with full torque, from the thread where I demo this with the drill...
by Lebowski
Aug 18 2019 10:23am
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 575
Views: 88101

Re: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15

Ok, thanks... i use a totally different method and am not familiar with the usual terms...

P.s. i am not using the method described in the Microchip AN's
by Lebowski
Aug 17 2019 6:22am
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 575
Views: 88101

Re: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15

Ive heard this term before but dont know what it is, flux linkage ?
by Lebowski
Aug 14 2019 1:19pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 715
Views: 32824

Re: APL's DIY axial-flux motor

I used plexiglass (acrylic glass) for the stator... easy to work, cheap, strong, not so heat resistant but more than the winding insulator...
by Lebowski
Aug 14 2019 1:21am
Forum: Motor Technology
Topic: Legit electric motor technology breakthrough?
Replies: 19
Views: 1675

Re: Legit electric motor technology breakthrough?

I don't see the commercial sense behind changing a simple electronic field weakening system (the standard one where its done in a bit of software in the controller) for an expensive mechanical field weakening system...
by Lebowski
Jul 27 2019 2:59am
Forum: E-Bike General Discussion
Topic: Is it realistic to expect using y DIY ebike all year round in Switzerland?
Replies: 20
Views: 522

Re: Is it realistic to expect using y DIY ebike all year round in Switzerland?

https://www.baselland.ch/politik-und-behorden/direktionen/sicherheitsdirektion/motorfahrzeugprufstation/fahrzeugprufung/technische-aenderungen/e-bike-eigenbau Have a look at the pdf, page 5. I think this is the type you want to build. 20kmh with gas, 25 kmh without so only support when pedalling (hy...
by Lebowski
Jul 26 2019 2:49pm
Forum: E-Bike General Discussion
Topic: Is it realistic to expect using y DIY ebike all year round in Switzerland?
Replies: 20
Views: 522

Re: Is it realistic to expect using y DIY ebike all year round in Switzerland?

There are some restrictions (but don't take my word for it). Bikes with gashandle, only up to 20 kmh, pedal assist up to 25. Forget about getting a 45 kmh homemade bike approved, so many hoops to jump through... Best is just to be aware you're doing illegal stuff, so don't draw attention to yourself...
by Lebowski
Jul 26 2019 9:14am
Forum: E-Bike General Discussion
Topic: Is it realistic to expect using y DIY ebike all year round in Switzerland?
Replies: 20
Views: 522

Re: Is it realistic to expect using y DIY ebike all year round in Switzerland?

Yep, also used it at -10C. One day while cycling in the snow I had so much ice on my rear sprockets that the pedalling chain kept slipping (it was ice-rain, the whole sprocket thing was a block of ice) but the motor was fine. Rode to work the last 5 km on motor only (which used a separate chain to t...
by Lebowski
Jul 26 2019 5:21am
Forum: E-Bike General Discussion
Topic: Is it realistic to expect using y DIY ebike all year round in Switzerland?
Replies: 20
Views: 522

Re: Is it realistic to expect using y DIY ebike all year round in Switzerland?

I did 25km a day on my homemade bike with my homemade motor and homemade controller. All worked flawlessly for 11000km at which point the batteries were end of life...
by Lebowski
Jul 21 2019 2:55am
Forum: Motor Technology
Topic: Ampera/Volt inverter with Lebowski brain
Replies: 57
Views: 2578

Re: Ampera/Volt inverter with Lebowski brain

Maybe show a quick schematic of your intentions wrt the current sensors and the 2k2 resistors ? And I dont understand the bit about the 4k7 capacitors ?
by Lebowski
Jul 19 2019 5:03pm
Forum: Motor Technology
Topic: Ampera/Volt inverter with Lebowski brain
Replies: 57
Views: 2578

Re: Ampera/Volt inverter with Lebowski brain

I think i used 1 kOhm and 10 nF in the (single) current sensor lines... for two sensors each sensor would need its own 2.2kOhm resistor in series with its output and then connect to the 10 nF. The resistor is a bit higher because two 2.2kOhm's in parallel is roughly 1 kOhm. This way by using equal r...
by Lebowski
Jul 19 2019 3:48pm
Forum: Motor Technology
Topic: Ampera/Volt inverter with Lebowski brain
Replies: 57
Views: 2578

Re: Ampera/Volt inverter with Lebowski brain

You dont, just have to match wiring length and trust inductance and ptc to equalize the currents...
by Lebowski
Jul 19 2019 12:32pm
Forum: Motor Technology
Topic: Ampera/Volt inverter with Lebowski brain
Replies: 57
Views: 2578

Re: Ampera/Volt inverter with Lebowski brain

Dont thjnk parallelling two output stages is a problem, but I would definitely use all 6 current sensors then ! You can add the current sensor outputs using resistors.
by Lebowski
Jul 14 2019 3:49am
Forum: General Discussion
Topic: Retirement Time
Replies: 252
Views: 23508

Re: Retirement Time

Since beginning of this month I started my 'semi'-retirement. I did not want to completely stop working (a bit too young for that at 47) and want to keep paying into my state pension, but I also wanted a lot more free time to travel. Managed to negotiate a 60% contract, so need to work only 3 days a...
by Lebowski
Jul 11 2019 3:41pm
Forum: E-Bike General Discussion
Topic: DIY motor
Replies: 17
Views: 672

Re: DIY motor

I would say 10 kW is possible... my tripple stator axial flux is around 3 kW, it is limited by rpm (1500). If you manage to get the rpm up by a factor 3 to 4 you are there. My rpm is limited to 1500 because of balancing and possibly the (bicycle)axle choice. Use a high speed axle, have the rotor pro...
by Lebowski
Jun 24 2019 11:18am
Forum: E-Vehicles General Discussion
Topic: Mercedes new ISG system, with 48V lithium battery
Replies: 7
Views: 721

Re: Mercedes new ISG system, with 48V lithium battery

Sounds very much like what Suzuki does, but they have an alternator style device coupled to the motor via a normal belt. It can act as starter, generator and motor, but it all goes through the belt.
22_SWIFT_SHVS-mild-hybrid.jpg
by Lebowski
Jun 16 2019 12:18am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 715
Views: 32824

Re: APL's DIY axial-flux motor

Are you sure you cannot rotate the one rotor plate, and measure the AC voltage of the individual windings when you do so ? This is a good test for each coil and for your coil interconnections.
by Lebowski
Jun 16 2019 12:13am
Forum: E-Bike Build Threads / Photos & Video
Topic: Hacking a Couple Stromers
Replies: 110
Views: 31139

Re: Hacking a Couple Stromers

Ok thanks ! Than the one on the local auction site is not for me...
by Lebowski
Jun 15 2019 6:08am
Forum: E-Bike Build Threads / Photos & Video
Topic: Hacking a Couple Stromers
Replies: 110
Views: 31139

Re: Hacking a Couple Stromers

What are the dropout for the ST1 motor ? 135 mm ?
by Lebowski
Jun 13 2019 7:59am
Forum: Motor Technology
Topic: Ampera/Volt inverter with Lebowski brain
Replies: 57
Views: 2578

Re: Ampera/Volt inverter with Lebowski brain

Nissan Leaf makes 280Nm up to 2800rpm then it goes into isopower knee. However i think this could vary with different voltage. I could provide 420Vdc and could move the knee to the right by some 2000rpm. Then i would get 250Nm at 5000rpm which i intend to do later with my car. Limitation here is th...
by Lebowski
Jun 13 2019 4:44am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 715
Views: 32824

Re: APL's DIY axial-flux motor

for which voltage to expect you'll have to go on the internet and search how much flux your magnets produce. then with the amount of winding you'll stand a chance of calculating it. Easier is to measure one coil (take motor apart, use thin wires to connect coil to outside world as no current is flow...