Sensorless control of synchronous reluctance motors using on-line parameter identification method not affected by position estimation accuracy

Abstract

SUMMARYThis paper presents a novel on-line parameter identification method for sensorless control of Synchronous Reluctance Motors (SynRMs). Although conventional sensorless control methods based on mathematical models usually need some complex measurements of motor parameters in advance, the proposed identification method does not require them and can be realized on-line. The proposed method identifies motor parameters under sensorless control, so rotor position and velocity cannot be used to identify these parameters. However, the proposed method does not need rotor position and velocity, and identified parameters are not affected by these estimation errors. The sensorless control using identified motor parameters is realized, and the effectiveness of the proposed method is verified by experimental results.

Method for on‐line estimation of electrical motor parameter variation and current sensor offset for SPM motor

“…Here T c denotes sampling time. Equations (7) and (8) are obtained by assuming a steady state (s = 0) in Eqs. (1) and (2).…”

“…Equations (9) and (10) are obtained when the parameters in Eqs. (7) and (8) are represented by their nominal values. Thus, estimated currents at steady state are found by the current simulator.…”

“…Furthermore, parameter variations caused by temperature during continuous operation cannot be taken into account. To solve this problem, various realtime identification methods have been proposed recently with regard to parameter variations in continuous operation [6][7][8][9].…”