METHOD FOR DETERMINING POSITION OF ROTOR OF ROTARY ELECTRIC MACHINE EXCITED SEPARATELY

PROBLEM TO BE SOLVED: To provide a method for determining the position of a rotor in a rotary electric machine. SOLUTION: A power is supplied to a stator winding set from a corresponding converter unit, and to a rotor winding set from a corresponding excitor unit. First of all, the stator winding set is short-circuitted by the converter unit, and thereafter a voltage signal (Uerr) in the excitor is applied to the rotor winding set by the excitor. The voltage signal (Uerr) in the excitor has a change from a variable first voltage value (U1) to a second voltage value (U2). Further, a three-phase stator current is determined in each winding of the stator winding set, and the positional angle (θ) of the rotor is calculated from an x component and a y component in the space-vector conversion of the three-phase stator current. COPYRIGHT: (C)2009,JPO&INPIT