Part 4 Rotor Options for the Axial Flux Alternator

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6 жыл бұрын

Comparative performance analysis for the baseline axial flux alternator of the batteryless electric bike with rotor intermagnet inserts.

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@TecnoDesarrollos 6 жыл бұрын

Again... Incredible, very good job.

@erlinghagendesign 6 жыл бұрын

hello, excellent video series! May I ask: what is the name of the free finite element program?

@YesEinstein 6 жыл бұрын

Dear SURE D Thanks. FEMM 4.2

@jimmaxwell2259 2 жыл бұрын

Great job you have done explaining this...concise and to the point. I would love to know the relevance in the shape of the iron inserts(not the magnet inserts). Why not a solid iron insert instead of the (u/n) shape shown? Could this shaped iron piece have much thinner walls and still do the same job? Also, instead of the double depth magnets, what would happen if the iron insert was replaced by another magnet of opposite polarity, such that the flux was repelled? So many questions? lol

@YesEinstein 2 жыл бұрын

Dear Jim Maxwell. Thanks. The iron is a low impedance in the magnetic circuit with the same shape as a main magnet to maintain path cross section. Half width bottom and side walls gave near identical results. Replacement by magnet material would increase the circuit resistance and tend to demagnetise. Regards YE

@jimmaxwell2259 2 жыл бұрын

@@YesEinstein Thank you, much appreciated.

@arrowmid 6 жыл бұрын

Hello, super videos. Do the stacked stator phases produce meaningfully different power levels, given their different distance to the rotors?

@YesEinstein 6 жыл бұрын

Dear Jeff, Thanks. Not so. The three phases overlap only outside the magnet coverage. Each completely fills the distance between rotors except for a small clearance. The phases ( red, blue and yellow in the diagrams) are physically identical and thus generate essentially identical outputs at progressive 120 degree delays. See Part 3 for practical detail. Regards YE

@arrowmid 6 жыл бұрын

Thanks for the elucidation. I hope more videos are forthcoming. One about the controller would be good.

@RicardoSousa-sp4mm 4 жыл бұрын

Can you give me dimensions of magnets and distances between them? Also rotor dimensions. I would like to reproduce this. Thanks a lot

@YesEinstein 4 жыл бұрын

Dear Ricardo Sousa, The prototype had 30x10x5mm magnets at 15 mm pitch; 24 off per rotor for 360 mm inside circumference. This and other constructional data may be found in my most recent videos, comments and replies. Bon Voyage, YE

@denz37 Жыл бұрын

This is great video, but Im sorry sir, i still dont get it how to calculate optimum air gap between magnet, maybe English not my primary language. Can u help me my magnets is ferrite 19x19x10 mm 2000gauss, i joined them so the size 57x19x10 mm, my rotor disk 3mm, and i made 12poles. Thank you

@YesEinstein Жыл бұрын

Dear Denz' Thanks. With 25mm pole pitch at inside radius, best gap appears between 6 and 10mm; 8mm nominal. You could prove by inserting a single thin trapezoidal coil with each leg centred on a pole for a range of gaps. Maximum deliverable power is indicated where its voltage squared x gap width is a maximum.

@denz37 Жыл бұрын

@@YesEinstein thanks sir, I will try it

@robmad7657 6 жыл бұрын

This is very interesting project. Do you have a web page or direct email to contact you? I would like to know how much Watts can achieve your Axial Flux Alternator, gas engine cc? I'm working on a similar project and if I may, I would like to share details with you. Regards!

@YesEinstein 6 жыл бұрын

Dear Roberto Madriz, Thanks. Engine is 35 cc 4 stroke, nominally 1 Kw @ 7000 rpm. See other videos and comments. Helpful technical comments via KZfaq are more than welcome. Regards YE

@robmad7657 6 жыл бұрын

Thank you YE, yes I saw all your videos, just amazingly detailed videos, thanks for your share. I Believe same generator with a 2 stroke engine would produce more power, pollutants can be reduced with a fiberglass filter silencer. I want to make a generator able to produce more than 2kw to move an electric vehicle for much more autonomy than batteries, and at the same time very efficient.

@YesEinstein 6 жыл бұрын

Dear Roberto Madriz, It may well work with a more powerful engine, but according to its FOM, doubling the power output at the same engine speed would at least quadruple dissipation in the rotor. The FOM/dissipation expressions in Parts 2 and 3 indicate scaling options that control the dissipation. Regards YE

@srirammech100 5 жыл бұрын

hi Can you please help me in developing a 3KW axial flux motor please. ?

@srirammech100 5 жыл бұрын

@@YesEinstein Hi Thank you for your reply. Expected motor specification Rated Torque - 50Nm Rated RPM - 550rpm Peak Torque - 100Nm Peak RPM - 650rpm Nominal Voltage - 48V or 72V

@srirammech100 5 жыл бұрын

@@YesEinstein daimeter max 120mm

@YesEinstein 5 жыл бұрын

Not practically possible. 600 mm could work for very approximately 160 watt dissipation in the rotor, or 80 Watt total if double stacked. (Reference my Part 3 appendix on scaling options) You might just linearly scale up my design, retaining air gap and magnet thicknesses. Look forward to seeing your realisation. Regards YE

@srirammech100 5 жыл бұрын

@@YesEinstein 600mm is too large is it possible to limit the diameter to 200mm and increase the stack?

@YesEinstein 5 жыл бұрын

Dissipation is proportional to square of (power throughput/ rpm). According to Part 3, even if 40 Watt dissipation could be tolerated per 200mm stack, an impractical 15 might be needed for 3 kW.

@jusuflazami9580 Жыл бұрын

Can anyone explain me as a beginner, where and how can i endeavor an 10KW design in this Method in details (for Dummies :) ) please?

@YesEinstein Жыл бұрын

Best keep looking and learning. YE

@lifestyle1358 3 жыл бұрын

Hello professor.. I'm mahesh and also studying, I want to know something about axial flux genarator. Thanks

@YesEinstein 3 жыл бұрын

It's good

@lifestyle1358 3 жыл бұрын

@@YesEinstein Thanks professor These days I'm reading some pdf, videos about axial flux genarator.. This is my email maheshjapura@gmail.com

@YesEinstein 3 жыл бұрын

@lifestyle1358 3 жыл бұрын

@@YesEinstein hello professor I'm going to build a axial flux genarator 2000W at 500 RPM, Stator diameter 15inch 70V at 500 RPM Magnet size and grade How many coils (hope 12 coils) Coil pre turns and wire gauge How many phase Can you calculate for me Please helps Thanks

@YesEinstein 3 жыл бұрын

Dear mahesh chathuranga, Doing some sums. Regards YE