A Novel SRD Indirect Rotor-position Detecting Scheme of Combining Opposite-connect sensing coils Technique with Resonance Technique

摘要

Rotor-position detection either directly or indirectly is essential for SRD (Switched Reluctance Driver) operating in variable-speed drive applications. Direct rotor position sensors provide stable operation of the drive system. However, the use of direct sensors leads to reliability problems in certain industrial environments e.g. high-temperature conditions or where electromagnetic interference is present. Indirect rotor-position sensing is an attractive alternative in such applications. With the great efforts of the scholars all over the world, Indirect Rotor-position Detecting Technology has been developed a lot. By now, Indirect Rotor-position Detecting Technology has become one of the most popular projects in SRD research area. A novel SRD indirect rotor -position detecting scheme which get the real time rotor-position by measuring the inductance of the test windings, is presented in this paper. Opposite-connect sensing coils technique and series resonance technique are introduced to get rid of the disturbance caused by interior electromagnetic field of SRD. The principle of the scheme is described in detail. And in addition, Some specific approach on how to realize proper control of SRD's starting and running, is supplied. Extensive experiments have been carried out to validate the feasibility of the scheme. It is concluded that the scheme provides stable and proper rotor-position signals.