Position Sensorless Control for PMSM Drives Without DC-Link Voltage Sensor

This passage introduces an innovative, cost-effective control strategy that eliminates the need for motor position sensor and DC-Link voltage sensor in drive control systems for permanent magnet synchronous motors (PMSM). The manuscript explores the mathematical correlation between DC-Link voltage and rotor speed within the framework of a PMSM mathematical model. As a result, it is shown that rotor position and voltage can be effectively estimated by modifying the positionless control method with good performance, Extended Kalman Filter (EKF) technique, and adding the correlation on the basis of the algorithm. Taking into account the stabilization effect of the DC-Link capacitor, which ensures that the bus voltage remains relatively constant, the estimated DC-Link voltage can be refined through a low-pass filter. The practicality and reliability of this approach are confirmed by the outcomes of simulation tests.