Research on combined three-subsection permanent magnet model in the close magnetic circuit

The equivalent processing of permanent magnet (PM) is precondition and foundation of designing or analyzing polarized magnetic system. In order to study PM working hypostasis simply, the paper presents a computing method of solving the working points about the model by theory analysis. This method is validated by simulation and experiment. In final, it concludes that each PM subsection has worker on different recoil line, and PM subsections which are close to the end of model would work at the recoil line locating in the first quadrant sometimes.