Identification of high frequency resistances and inductances for sensorless control of PMSM

Decoupling of the Secondary Saliencies in Sensorless PMSM Drives using Repetitive Control in the Angle Domain

“…With the injected HF signal, the increasing eddy current losses and hysteresis losses are responsible for the increase in the resistance [14]. In [14], [15], the authors point out that the resistances also show a saliency which is called resistive saliency and can be used to estimate the rotor position [16].…”

“…With the injected HF signal, the increasing eddy current losses and hysteresis losses are responsible for the increase in the resistance [14]. In [14], [15], the authors point out that the resistances also show a saliency which is called resistive saliency and can be used to estimate the rotor position [16]. In [14], [15] the resistance is measured under different currents and frequencies in distributed windings PMSMs, and it is pointed that the resistance saliency increases with an increase in the frequency of the injected HF signal [16].…”

“…In [14], [15], the authors point out that the resistances also show a saliency which is called resistive saliency and can be used to estimate the rotor position [16]. In [14], [15] the resistance is measured under different currents and frequencies in distributed windings PMSMs, and it is pointed that the resistance saliency increases with an increase in the frequency of the injected HF signal [16]. However, the inductances show inherent saliencies resulting from different magnetic saturations between direct-axis and the quadrature-axis (d-and q-axis), which are called inductive saliencies and are strong when compared with resistive saliency [14], [15].…”

“…In [14], [15] the resistance is measured under different currents and frequencies in distributed windings PMSMs, and it is pointed that the resistance saliency increases with an increase in the frequency of the injected HF signal [16]. However, the inductances show inherent saliencies resulting from different magnetic saturations between direct-axis and the quadrature-axis (d-and q-axis), which are called inductive saliencies and are strong when compared with resistive saliency [14], [15]. There is no doubt that most methods utilize inductive saliencies to estimate rotor position.…”

“…It is impossible to get this information on a commercial machine from the manufacturer. Therefore, measurement methods, such as the ac standstill test [21], [23], or the small-signal perturbation method [14], [15], are preferred by researchers. In the ac standstill test, the neutral line of the stator windings must be available [23].…”