Induction regulator

An Induction regulator is a device, based on an induction motor, which can provide a continuous (analogue) variable output voltage. In the past, it was used to control the voltage of electric networks. Nowadays, it has been replaced in this function by the tap transformer. Its usage is now mostly confined to electrical laboratories, electrochemical processes and arc welding. With minor variations, its setup can be used as an isolator phase-shifting power transformer.