Design of a Permanently Magnetized Hypocycloidal Reluctance Machine: Adapting the rolling rotor concept to generator and converter operation

Abstract

Investigations into the nature of the HRM in general, and a PMHRM-design in particular, were undertaken. Two separate simulation models, based on a magnetic equivalent circuit and FEM-model of the machine were built and used to find inductances, induced voltages and torque potential. The process of building a prototype was started and ran parallell to the theoretical studies. A CAD-model of the machine and it's parts was built up, and stator laminations and magnets were ordered. Plans for the assembly were made, and the assembly work started. Some main conclusions are:The PMHRM has a very high torque potential. Individual control of the coils increases makes it higher than for the traditional HRM-design. PM magnetizing of the proposed HRM-machine is most sensible for generator operation, since the actuator approach in combination with individual control removes the need for DC-magnetization.Ratio of rotor to stator radius should be close to unity to achieve a high torque densityCog wheels are not ideal mechanical bearings, as interlocking restricts the rotor ratio