help with IR2110 chips

[Alec_t]

so if I get 6 on then I'll be safe

That would provide the power, but not necessarily the voltage. If you've designed your inverter around a 50Hz 1:8 step-up transformer and want 240V rms out, that implies the inverter needs 30V DC input, so your generator would need a 30V DC output able to provide > 0.6A.

what would you get?

I wouldn't get anything more until you have a design with a greater chance of success. Have you researched the topic thoroughly, to see if other builders have coil arrangements with a higher output voltage, or a much greater number of coils, or different magnetic circuits, to give the current/voltage/power your application needs?

 

[Maglatron]

my transformer is a 230primary and 15 0 15 on the secondary coils I can parallel the output coils so that the ratio stays at 15.3 to 1 and use the secondaries as the primary the secondary will be splitting the resistance between two as well, so the resistance of the secondary will be halved but because i'm using it as a step up it will be 1 : 15.3

 

[Maglatron]

ok I'll start with the two that I do have and try and work out how much I can get from them

 

[Alec_t]

because i'm using it as a step up it will be 1 : 15.3

Then your generator will need to give a rectified ~15V DC out at >1.2A.

 

[Maglatron]

yes ok so how would you wire up a bridge rectifier with the one coil because when I measured it my way it gave 28volts rectified, I want to see how you would do it can I get a spice image please, thanks

 

[Alec_t]

I want to see how you would do it

I can't do it with one coil.

 

[Maglatron]

you can't rectify 1 coil to dc?

 

[Maglatron]

ok so I know you said it was a bad idea to buy anything else but I have to see this through so I have bought 6 coils guage 0.724 500gram, so should be a bit less than 7ohm I get my new magnets tomorrow and will put 10 either side and without the phase shift of 120 degrees, on to my spare flywheel the coils come in 10 days and I shall wrap them around bolts

 

[Maglatron]

actually comes between 7th and 14th of this month

 

[Maglatron]

found some the same size and weight as the two that I have!

 

[Maglatron]

I'll check back when I have wound and fitted the other 7ohm coil!

 

[Alec_t]

you can't rectify 1 coil to dc?

Of course I/you can, but that won't give the voltage you want at the current you want.

 

[Maglatron]

ok I'll get back to you when I've wound and fitted the identical 7 ohm coil, thanks, see the outcome and go from there!

 

[Maglatron]

so just to clarify do you think the magnets should be in phase? thanks
The post #448 arrangement doesn't provide voltage doubling, but would provide voltage addition if diodes D3 and D4 were removed.
However, because coil pairs 1 and 2 are not in phase their voltages partly cancel during parts of the wheel cycle.

 

[Maglatron]

so the reds are the front and blue the back, with 10 magnets in phase back and front, coil 5 would be in phase with 2 and 3, with magnets passing at the same time, and 1 and 4 would be in phase and have magnets passing those at the same time!! might just be able to fit a 6th coil on either the back top or the front bottom, space is tight though

 

[Alec_t]

As you will have seen from the waveforms in my posted sims, the sims model each coil being energised by a passing magnet more or less continuously, i.e near 100% "duty cycle". However, that would require no, or very litle, angular spacing between magnets.
In your machine, what is the magnet diameter (assuming magnets with circular faces), how many magnets per wheel face, and at what radius from the wheel centre are the magnet centres? Those figures would give a better idea of the real-world duty cycle, on which the average available power from the machine depends (among other things).
I suspect you may need a lot more coils to get the machine output required for driving that fan. It would be far more energy-efficient to power fan blades mechanically by whatever drives the wheel.

 

[Maglatron]

the rubber disk are 30cm in diameter the magnets are 2.5cm in diameter 3mm thick doubled up to make 6mm of magnet, the magnets are situated 7.5 cm from the axis there are 8 magnets either side or 16 if you double them up but effectively 8 magnets either side! going to put 10 on either side of the spare wheel and run it up and give it a go also I might add that the coil diameter of the new 7ohm sort are about 5cm and the cores are bolts with a diameter of 1cm but they have a nut on making them about 16mm, I think when a north is passing a coil - when it passes the bolt a south should be approaching (for the 10 magnet arrangement) at the moment with the 8 magnet arrangement the space between the magnets is roughly 2.5cm (I could fit a magnet between the mounted magnets snuggly)
but I am putting on 10 magnets not 16 so there will still be a gap between them! and I think that if the magnets have a 5cm gap centre to centre, it would be nice! it runs at 600 rpm nicely plus the two extra magnets at 600 rpm would make 50Hz!

 

[Maglatron]

I tried 5 coils in the sim and get this,

 

[Maglatron]

this is better the phase shift is 0 90 180 and 270! just number 5 that has the same as 4

 

[Harald Kapp]

Your 5 voltage sources are all the same: SINE(0 14 50 0 0 0). There is no phase difference.
Your diodes lack the model. You need to assign a valid model to the diodes (right click). See my example below

This is my result with 3 sources and 120 degrees phase shift: