Comparison of high frequency signal injection techniques for rotor position estimation at low speed to standstill of PMSM

Sensorless control for the deployable structure of the antenna based on square-wave injection method

“…To achieve closed-loop control, the traditional control method of PMSM requires sensors [1] , such as optical encoders, resolvers, and magnetic encoders [2] , to obtain speed information and rotor position information [3] , which brings problems such as reduced reliability [4] , increased volume [5] , and increased cost [6] . Therefore, PMSM sensorless control technology has become a research hotspot.…”

A novel initial rotor position alignment method for permanent magnetsynchronous motor using incremental encoder

“…Therefore, several techniques have been proposed by researchers to calculate the initial rotor position without using any sensor. Applying a high frequency signal to motor phases [2][3][4][5][6], saturating the stator magnetic core [7][8][9][10][11], and utilizing the inductance variation according to the rotor position are some of the techniques proposed in the literature [12][13][14]. Although sensorless control methods are advantageous in many respects such as cost, weight, volume, and design complexity [2], the position sensor must still be used to provide high-resolution positional accuracy if the application requires positional control.…”