A proposal for a new hybrid field motor with interpolar gap and permanent magnets

Recently, interior permanent magnet motors (IPMs) or motors with field winding have been investigated from a viewpoint of magnetic field control. The IPMs have an advantage of field weakening, however, its overall flux passing the stator core is not sufficiently suppressed. On the other hand, the motors with field winding can control more wide range, however, they need the field windings and are the complicated shape and heavy. In this paper, a new type of hybrid field motor without a field winding is proposed, whose rotor has regular salient poles arranged with interpolar gap and permanent magnet. And it is clarified that the interpolar gap and permanent magnet motor (IGPM) is more appropriate for field weakening control than the IPM from the basic equations related to flux and torque. We found that the proposed IGPM has yielded successful FEA simulation and experimental results.