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Forum Index : Windmills : 2 Speed F&P Turbine

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GWatPE

Senior Member

Joined: 01/09/2006
Location: Australia
Posts: 2127

Posted: 08:24am 06 Dec 2007

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Hi Herb,

herbnz said Use independant instead delta same thing Then you can get star two contacts shorting out one AC side bridge better tho to disconnect then short for star needs three change over contacts

Sorry mistake in two contact version should short out one end leg each winding

This was very close, to ideal star/delta wiring. The discussions on the other thread using rectifying diodes at the star point will make for a very smooth transition, as power to the load is not interupted. A single, double pole single throw relay will do.

cheers, Gordon.

become more energy aware

herbnz

Senior Member

Joined: 18/02/2007
Location: New Zealand
Posts: 258

Posted: 01:05pm 06 Dec 2007

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Also check some disscusion Topic F&p not smartdrive some disscusion there .
HerbEdited by herbnz 2007-12-07

domwild
Guru

Joined: 16/12/2005
Location: Australia
Posts: 873

Posted: 04:58am 07 Dec 2007

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Marc,

Whilst the Picaxe code has been given for Amps by Gordon, similar code could be used to simply switch star/delta on RPM with a Picaxe. The idea is similar to Commanda's LM2917 RPM switching.

From faint memory, the Picaxe can count pulses and can also detect the time between pulses, so no problem getting the RPM from the AC side.

So many solutions, so little time!

Regards,

Taxation as a means of achieving prosperity is like a man standing inside a bucket trying to lift himself up.

Winston Churchill

GWatPE

Senior Member

Joined: 01/09/2006
Location: Australia
Posts: 2127

Posted: 06:16am 07 Dec 2007

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Hi Dom,

There are many ways to effect the changeover. I offered the amp solution as it more effectively represents the power. Other solutions may be more difficult to match the best switching point.

cheers, Gordon.

become more energy aware

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