ABSTRACT
Switched reluctance machines are typically double salient and have one- or multiphase armature windings (on the stator) that are connected in sequence and triggered by the measured (or estimated) rotor position. The simplicity (ruggedness) of the SRM with tooth-wound coils is staggering. In an effort to reduce the radial flux density (normal force) but encourage tangential (torque) force on the rotor, a segmented glass-shaped rotor was sandwiched between two stators with diametrical coils and corresponding outer and inner phases in series in a two-airgap structure. Though with much longer end coils, notably, more torque is obtained for the same geometry, copper, and current density than with tooth-wound coils. But the topology is more complicated and thus not easy to fabricate.
