SINGLE-PHASE TRANSFORMER WITH ROTATING MAGNETIC FIELD Russian patent published in 2008 - IPC H01F30/14 H02M5/14 

FIELD: electrical engineering.

SUBSTANCE: invention pertains to electrical engineering and can be used as an input organ for protective and automation devices for power supply systems. The single-phase transformer has four primary coils on a toroidal core, ballast resistors and an inductor, multi-phase secondary coils. The beginning of the first coil is joined to the end of the second coil, forming the first input of the device. The end of the first coil is joined to the end of the third coil, the end of the second coil to the end of the fourth coil. The end of the third coil is joined to the ballast inductor, and the beginning of the fourth coil is joined to the ballast resistor, the other ends of which form the second input of the device when joined. To obtain a rotating magnetic field, the first, second, third and fourth coils are on the toroidal magnetic core with shift of 90 degrees from each other. The number of turns in the first and fourth coils is more than twice the second and third coils.

EFFECT: elimination of phase shifting elements when converting single-phase voltage into multi-phase voltage.

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