axial flux alternator 10 KW

homebuild generator for a Wind turbine with 6 m Diameter.

12 coils, 32 neodymium magnets. To be used with grid tie inverter made by Sieb & Meyer

70 Volts DC @ 40 RPM

Nominal Power 10 KW at 350 Volts

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People & Blogs

[Menelaos85]

I you want to create a 3-phase-system you need 8 magnet on each magnet plate and 6 coils. It is 1/3 more magnets than coils...always!

If the number of coils and magnets is equal, you will end up with a single phase generator and must connect all coils in series.

[Menelaos85]

It depends on what you consider full capacity. Full capacity again depends on voltage which again depends on RPM.

Example: 4 KW @ 200 RPM would be about 190 Nm torque. 4KW @ 300 RPM would be about 120 Nm. rough formula is Power in watt/ RPM*10

[Menelaos85]

I used block shaped magnets of 80x40x20mm in size.

[Menelaos85]

10 KW peak is realistic for peaks of several minutes, no doubt about this as I did make paractical tests on 10 KW for more than 15 minutes without stator temperature climbing above 60 degrees celsius. The resin can bear 135 degrees, the wire can withstand 180 degrees. Anyway, it all depends on voltage. This unit is oonly limited by current and is rated for about 30 Amps. If you go for 700 V, u can get 20 KW but then RPM would be too high for a wind turbine

[Menelaos85]

It is Volts of course! There is no load on the machine in that video, it is only to demonstrate open voltage.

The Generator is definitively capable of 10 KW. It depends on the settings of the grid inverter. At 400 VDC I only need 25 Amps to get 10 KW, not 100 Amps. At 100 Amps, for sure this unit will turn into smoke :-(

On a test stand I had it running on 8 KW for more that an hour without it comming even close to overheating.

Thanx anyway for your comment :-)

[Menelaos85]

each coil has 120 turns of 1.6 mm wire. The system is not to charge batteries but for connection to the grid. It works with the Aurora inverter starting at 60 VDC.

If you use 12 coils i would advice to use 16 bigger magnets instead of 12 as space for the magnets is limited. If they are too close together, the flux will not go througfh the airgap but instead to the next magnet on the same disc.

[billmalta1]

@usfootman

Nice question u got there :o)

Because most electro or permanent magnet motor works on 3 phases AC...

-3 phases.... 9 coils needs 12 or 24 magnets, each phase has 3 coils and 3 mags passing at the same time inside them, so to be able to create a perfect AC wave you will need to setup the system so that current always passes without delay from phase A to phase B to phase C...

[Darealwhip]

Excelente video....

[peppedoko]

10 kw????? ahahahahahahhahahahahahahahaha­hahahahahaha

[zbrasky]

You need to make it so that once ya give it a 'push' it keeps on going-where it has it's own power source self contained-meaning that it needs-no water-no gas-no wind-no sun-no 'outside' electricity-it can be done and has been done-

[streamRBK]

10kW?, ok - at 6000 rpm?

[safdarblog]

I need a suggestion? I hooked up my 12V alternator to the battery (120Ah) directly by using a blocking diode & drove the turbine with motor & belt set-up and getting at about 18VDC. But when I connect my Ampere meter in series and noted the DC Amps there were only 1.67 amps going into the battery, while I have seen you video in which you are putting 21 Amps into the battery.

i have 10coils in series (Star Connection) 1.4mm wire & 90 turns each coil. I connected 3 halogen lamp in parallel got 10A

[speciess]

hi,can you upload the build instruccion for this wonderfull machine?

[usfootman]

does anybody knows why there suppose to be 3 times more magnets then coils? where did you got that information from?