Kyo-Beum Lee and Frede Blaabjerg, “A Simple Sensorless Scheme for Induction Motor Drives Fed by a Matrix Converter Using Constant Air-Gap Flux and PQR Transformation,” IJCAS (International Journal of Control, Automation, and Systems), vol. 5, no. 6, pp. 6 > Paper

This paper presents a new and simple method for sensorless operation of matrix converter drives using a constant air-gap flux and

the imaginary power flowing to the motor. To improve low-speed sensorless performance, the non-linearities of a matrix converter

drive such as commutation delays, turn-on and turn-off times of switching devices, and on-state switching device voltage drop are

modeled using PQR transformation and compensated using a reference current control scheme. The proposed compensation

method is applied for high performance induction motor drives using a 3 kW matrix converter system. Experimental results are

shown to illustrate the feasibility of the proposed strategy.