Research of vector-pulse start system of synchronous motor with intermediate transformer and sensorless determination of angular rotor position with mathematical methods

The article provides a detailed description of the system of vector-pulsed start with intermediate transformers. The proposed scheme includes a sensor-less determination of the angular position of the rotor. It will increase reliability of the system and reduce its cost. Furthermore, this configuration enables limiting inrush currents. The article is based on a comparison of the system of vector-pulsed start with intermediate transformers and without them. We have analyzed the dynamic and energy characteristics of the system. Oscillograph of the torque and speed has been analyzed. Power measurement circuit of vector pulse-start is presented. Power currents are analyzed. The conclusion about possible use of intermediate transformers is made. Thus, the use of intermediate transformers increases starting and loss of time in the system, but reduces the value of the circuit power.