Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back Mathematical model of synchronous motor with a controlled semiconductor switch on the stator by averaged values of the variables D.K. KOKHREIDZE Complex equations of transients are derived from the averaged values of the synchronous motor with frequency control. The controlled semiconductor switch connected to the bridge circuit is arranged on the stator and is controlled by the signals of the control system in accordance with the law of motor rotation speed control. Equations in the coordinates d, q are written down in the form convenient for programming on a computer with taking into account of all parameters of the machine. As a special case, from complete system of equations are obtained expressions of the currents and the motor torque in the steady-state operating mode. A comparative analysis of the operating modes of a frequency-controlled synchronous motor and a direct-current DC motor based on a synchronous machine is carried out. Keywords: frequency-controlled motor, semiconductor switch, valve motor, stator and rotor currents, torque. Contacts: E-mail: dKokhreidze@mail.ru Pp. 54-56.