a/c servo stabilizer,single phase/three phase

Can any one give me servo line voltage stabilizer circuit? It is very helpful wheather it has the trasformer details that are used in it. Moreover the electronic control circuits

A phase of buck boost transformer primary is connected to the fixed tab of the auto transformer and other connects with moving arm which is controlled by the servo motor. apart from it the buck boost transformer primary of servo stabilizer gets connected in the series of incoming voltage.
I think you go through the SERVOMAX it gives one step solution about servo voltage stabilizer.
**broken link removed**
thank you