Sensorless Control of SRM using Magnetizing Curves

Abstract

Among various variable speed drives, Switched Reluctance Motors (SRM) have been found competitive with traditional ac and dc motors because of their simple motor construction and drive electronics. However, the necessity of shaft-mounted position sensor is one of the drawbacks of SRM from the standpoint of cost, size and reliability. The position sensorless drives of SRM are expected to solve the problems.
This paper presents position sensorless control based on a simple fuzzy model of non-linear position-dependent magnetizing curves. The necessary sensors for this drive are one voltage sensor and one current sensor. The experimental studies using 1.5kW, 5, 400 rpm SRM with 6/4 teeth configuration show that the maximum error of rotor position estimation is less than 3 mechanical degrees in the 1:20 speed range under the any load condition.