Mirror‐phase characteristics of synchronous reluctance motor and salient‐pole orientation methods for sensorless vector controls

Abstract

In this paper, a mathematical model of the synchronous reluctance motor in a new form is established, followed by a new analysis of stator linkage flux of the motor, which characterizes the motor and plays an essential role in developing new rotor salient-pole orientation methods for sensorless vector controls. Finally in a unified manner based on the inherent characteristics of the flux, six new potential salient-pole orientation methods are developed and proposed. ©

Sensorless control of synchronous reluctance motors based on extended electromotive force model and inductance measurement

“…Two respective EEMF models can be expressed as in Eqs. (5) and (6) [21]; here all inductances are expressed in terms of L max and L min :…”

“…In both PMSM and SynRM, torque control performance can be improved by knowing the exact rotor position, which has led to abundant research on sensorless control [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. The control methods estimate the position by using the fundamental frequency component of the motor drive [2][3][4][5][6], the current/voltage difference [7][8][9][10], a special high-frequency signal [11][12][13][14], a particular form of inverter switching [15], triple harmonics that occur due to motor design [16], and so forth. In case of standstill or low-speed operation, little information is obtained from the fundamental component of motor drive, and hence control based on high-frequency signal or difference data is often applied.…”

A new investigation of dynamic mathematical model of synchronous reluctance motor—A simple unified analysis of model characteristics

“…Note that below, the orthogonal matrix Q(θ) defined in Eq. (5) shall be referred to as a mirror matrix [4].…”

“…Under the assumptions given above, the establishment of the following dynamic mathematical model consisting of the three basic equations, the circuit equation describing the dynamic electromagnetic relationship, the torque equation describing the mechanism of torque generation, and energy transfer describing the dynamic energy conversion and transfer, was demonstrated by Shinnaka in 1997 [2][3][4].…”

“…τ, N p , and R 1 , and s are the torque, number of poles, the winding resistance of the stator, and the differential operator d/dt. L i and L m are the particular stator inductances of the motor (below, they are called the same-phase and mirror-phase inductance [4]).…”