METHOD AND DEVICE FOR MEASURING EXCITATION CURRENT IN BRISHLESS MACHINES Russian patent published in 2012 - IPC H02P9/14 

FIELD: electric engineering.

SUBSTANCE: invention relates to the method and device intended for measuring excitation current in electric machine with a stator (2) and rotor (4). The electric machine (1) contains excitation transformer (7) to generate excitation current as a result of electro magnetic induction (I_DC) at the rotor side for powering excitation coil (6) to produce magnetic field of excitation. The method is consisted of four stages: control of excitation transformer (7) at the primary side so that to generate excitation current (I_dc) in the rotor (4), which is derived from the current induced in the excitation transformer (7) on the secondary side; measuring one or several phase current in one or more phases at the primary side of excitation transformer (7); measuring maximum current value (I_peak-measure) depending on one or more measured phase current (I_t); measuring excitation current (I_dc) through excitation winding (6) depending on the maximum current value (I_peak-measure).

EFFECT: simplification.

8 cl, 5 dwg