THREE-PHASE LAUNCHING INDUCTIVE RESISTOR Russian patent published in 2005 - IPC

FIELD: electro-engineering industry, in particular, engineering of launching devices, used for asynchronous engines with phase rotor.

SUBSTANCE: three-phase launching inductive resistor has magnetic duct, consisting of four coaxially positioned ferromagnetic plates, acting as yoke and forming additional likeness of ventilator blades. On each of three cylinders two semi-windings are positioned, fourth one - of the greatest diameter - finalizes the ferromagnetic system. Semi-windings are joined in accordance to zigzag scheme. First, second and third cylinders have different length, selected so, that surface area remained unchanged, to provide for same level of magnetic duct saturation. Through fourth (external) cylinder, additional portion of magnetic flow is closed, which flow is formed by winding of greatest diameter. End output of first semi-winding of greatest diameter, end output of first semi-winding of average diameter is connected to end output of second semi-winding of greatest diameter, end output of first semi-winding of greatest diameter is connected to end output of second semi-winding of middle diameter, beginning outputs of second semi-windings are joined at same point, and beginning outputs of first semi-windings are meant for connection at three-phase winding of rotor of asynchronous engine.

EFFECT: better conditions for device cooling when said device is built into engine.

2 dwg