Determination of parameters of the substitution circuit of an asynchronous electric machine with a massive rotor
The article considers the problem of determining the parameters of the equivalent circuit of an asynchronous electric machine with a massive rotor. To solve the problem, a technique was used to determine the structure and parameters of the mathematical model of an asynchronous electric machine with a massive rotor from known geometric relationships and parameters of the materials used. The equivalent circuit parameters of an asynchronous electric machine are determined by the least squares method. To do this, a series of calculations of the distribution of the magnetic field in an asynchronous electric machine is performed when the stator winding is powered by a sinusoidal current and a locked rotor (short circuit mode). The approximation is calculated using the theory of the field using the dependence of the parameter, taking into account losses in the rotor, and the stator phase inductance on the frequency of the stator current with a stationary rotor. The questions of the numerical solution of equations for determining the approximation parameters are considered. It is established that in order to take into account the effect of current displacement in a massive rotor in the mathematical model of an asynchronous electric machine, it is necessary to use three circuits on the rotor.