170 watts in - 1600 watts out - looped - Very impressive build and video

[pmgr]

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the question I ask is why 6 poles when there's only a two pole pickup assembly......  its like the bulk of the field will have very little impact...that's been my experience when dealing with such matters....

The relays have limited speed. For one rotation you need to trigger 36(x2) relays before the pattern repeats. If you have a stator with 2n poles, you only need to trigger 36/n relays before the pattern repeats. So for 6 poles (n=3) you are basically effectively increasing your switching frequency by a factor of 3 without having to get relays that can go three times faster.


PmgR

[listener191]

See attached.

If you have 6 poles, each coil pitch over 3 slots then you end up with an asymmetric flux.

If you use 3 poles, each coil pitch over 6 slots then you end up with symmetrical flux. The scheme is possible using H bridges instead of relays as you can then just increase the clock rate.

So it seems Pierre, restrained by the relay switching rate, just spread the 6 pole sequence beyond 360 degrees, to achieve symmetry.

L192

[listener191]

The attached is a dual H bridge board based on the L298N. 2A per bridge up to 46VDC. Offers a current sense output that might be useful.

So x18 of these would be required. This may be the cheapest way rather than building boards with MOSFETS. Various suppliers on ebay. Also save time.

L192

[listener191]

I should have mentioned.

The board will interface directly with the 2560 Arduino.

The board has recovery diodes, so just connect to the cap bank.

l192

[cheors]

Yes, these boards could be very useful.

https://i62.servimg.com/u/f62/18/62/17/81/dzgene10.jpg