Maximizing the torque of an asynchronous motor taking into account losses power when limited by the energy converter

The issues of optimal control of an asynchronous motor according to the criterion of the maximum of its electromagnetic torque are considered. It is shown that electric energy converters feeding the windings of electric machines have semiconductor switches in their composition, the characteristics of which are subject to known limitations. One of these characteristics for a semiconductor key is the value of the maximum current that it can pass through itself for a long time without breaking down. The electromagnetic torque of an asynchronous electric motor with vector control is proportional to two orthogonal currents with respect to each other - magnetization and load. The magnetization current determines the magnetization of the magnetic circuit, it has a significant effect on the operating modes of the machine. The geometric sum of these currents, called the stator current modulus, forms a current that flows through the converter switches. Each of these currents has its own control circuit. The control system limits the modulus of the stator current vector at a given level. There presented the formulas for finding optimal tasks for the circuits of the above-mentioned ones, which allow to obtain the maximum electromagnetic moment under given restrictions on the modulus of the vector of the stator from the side of the electric energy converter. It is established that in order to obtain the maximum electromagnetic torque of an asynchronous motor, it is necessary to take into account the nonlinearity of its magnetization. The paper calculates the maximum electromagnetic torque for various functions approximating the magnetization curve of the magnetic circuit of an asynchronous motor, and also performs an approximate calculation of power losses. It is proved that maximizing the electromagnetic torque makes it possible to significantly expand the mechanical characteristics of the motor and electric drive.