Problems of Mathematical Modeling of an Asynchronous Motor with External Asymmetry in the Rotor Circuit.

A mathematical description of an asynchronous motor with transformed stator windings is presented. A three-phase stator winding is reduced to an equivalent two-phase system and then to a system of axes stationary relative to the rotating rotor axes. The three-phase structure of windings is left unchanged in the rotor. The transformation consists of replacing stator holonomic windings with commutator type windings. Stator windings rotate in the direction opposite to normal rotor rotation and the rotor is fixed. As a result of this tranformation a constant, independent of rotational speed impedance matrix is obtained, suitable for analogue calculations. Equations of the motor with unsymmetric resistance, induction and supply voltages applied to the rotor are considered.