The ''Torus-flux'' motor - A novel permanent magnet synchronous machine

Contents An ironless permanent magnet synchronous machine with a toruslike armature is presented and its inverter-fed motor performance is discussed. The calculation of the three-dimensional flux density distribution is accomplished by analytical and numerical methods. Test motor experimental results are used to check these calculations. A comparison with permanent magnet motors with cylindrical rotor and surface mounted magnets shows that for the same rated data the ''Torus-flux'' motor needs a higher amount of magnetic material and armature copper.