Star Delta Controller
 The Star Delta Controller has been designed for windmill and hydro alternator applications.
    What it does: It allows an alternator with a three phase winding to be switched from
star configuration to delta. The design is not limited to a star or delta configuration. The
relays turn on or off, at the selected rpm and it is the users choice what application should be
performed at that point. In any case, it does allow optimum power to be extracted from
the alternator. The relays in the photo are standard automobile relays. The board is quite
small, less than 4 sq. in.
 
    The user has the ability to control at what rpm ( windmill blade speed) the switch
takes place and the duration the windmill must maintain a specific rpm before that
change takes place. This is done with a 10 pin 5 switch DIP that is located
on the main control board. This give 32 rpm selectable options from 25 to 800
rpm in 25 rpm steps.(picture and schematic
below are NOT the new  Star/Delta. We will update photos.)
The control board is small and can be built into the alternator
itself if the alternator does not get excessively hot or in close proximity to it. The main
chip is a programmed AVR and greatly simplifies the circuit. This chip is relatively trouble
free. It is U1 on the schematic. The picture shows three relays used to control an alternator,
However, they are not required if only one change is required at the desired rpms.


  <>The relay portion of the controller is separate from the main board. This
allows many different relay types to be used and other options such as SCR
circuits to be developed. The alternator section is in dotted lines. This is only an
example and actual layout may be different.Relays are standard automotive relays
and WILL NOT be included with the kit. We buy ours from Allelectronics at
a greatly reduced price.