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DaveP68
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Posted: 13 August 2017 at 12:16pm | IP Logged Quote DaveP68

Has anyone tried to add "Power Factor Correction Capacitors" to an F&P stator?

Tried it today with 3x 2 uf 275 VAC capacitor wired in Delta across the 3 phases of a 1x 12p Delta stator.

With out capacitors I got 236 VDC 2.8 A = 660 W at 600 RPM.

Added the 3x power factor correction capacitors and got 272 VDC 2.8 A = 761 W at 455 RPM.

That was first try so I know there is still room for improvement.

The power transfer of energy seems to be better, as this test was done on my 1200 W drill in the low speed setting. When I was testing some other stators connected to cap doublers about 2 months ago the maximum power output using the same drill was 700 W.

Will try a 4x 3p Delta with 3x 50 uf AC capacitors on my next test.


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DaveP68
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Posted: 17 August 2017 at 12:32am | IP Logged Quote DaveP68

This is some more information copied across from Fred's "f n p gridtie windturbine, triple stator" topic.

Here's a photo of version 1 power factor correction capacitors used for testing.



When using a capacitor doubler setup, found that the required torque was much greater with more power in for a given output. Max output with the drill was 700 W.

Just completed another test and got 870 W @ 488 RPM so this is now the gift that keeps giving!! Haven't even optimized it yet, so expect that number to keep going up. But a jump of 170 W over a capacitor doubler using the same drive system is a very big change!!

It works by removing the peak current pulses that occur due their "narrow conduction angle" through the 3 phase rectifier.

Here's an illustration of "NO" power factor correction on a single phase rectifier.



Here is a 3 phase power factor correction capacitor circuit (Delta).



David

Edited by DaveP68 on 17 August 2017 at 12:37am
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