Design and Construction of a New SRM Sensorless Driver

A new sensorless circuit for Switched Reluctance Motor (SRM) is designed, constructed and tested in this paper. The circuit uses three steps to control the SRM. One of them is used in motor starting. The other one controls the motor in low speed and the third one is used in high speed. These steps areimplemented by an inexpensive AVR microcontroller chip. An asymmetric bridge converter is used to excite the winding of themotor phases. The presented sensorless board is thenconstructed and tested on two SRMs which are three-phase 12 by 8 and three-phase 6 by 4 SRMs. The parameters of thesemotors which are required in sensorless techniques are obtained by Finite Element Method (FEM) analysis. Theoperational waveforms and results that are obtained inlaboratory are illustrated in different figures

Keywords:

Sensorless , SRM , Asymmetric Bridge Converter