Uncertainty Evaluation in Inductance Measurement of Synchronous Reluctance Motors

The complexity of inductance measurement for line-start synchronous reluctance motors (SynRMs) is studied. The development in these motors is motivated by the growing demand for energy and material efficiency. In response to the stringent efficiency level outlined by IEC standards, the study explores the use of SynRMs and their synchronization challenges. The main objective is to evaluate the uncertainty associated with the inductance measurement method specifically adapted to line-start reluctance synchronous motors. The quasi-static approach adopted for inductance measurement is described in detail, emphasizing its importance in determining SynRM behavior. The uncertainty assessment, incorporating Type A and B methodologies (that characterize different sources of uncertainty in measurements), provides a solid understanding of the reliability of the measurement. Experimental results show the different values of motor inductances, which are critical for accurate torque calculation. The harmonic analysis emphasizes the importance of accurately measured inductance in simplified and full-order harmonic models. The calculated total harmonic distortion (THD) serves as a parameter for motor harmonic purity. This research contributes to the advancement of inductance measurement techniques for line-start synchronous reluctance motors, promoting their optimal use in industrial applications.