Design and experiments of a novel axial flux circumferential current permanent magnet (AFCC) machine with radial airgap

In this paper, an improvement to the axial flux, circumferential current (AFCC) machine is presented by introducing a radial airgap instead of an axial airgap. Sizing equations and three-dimensional finite element analyses are presented to predict the flux distribution, inductance, torque capability and other performances of this novel machine. Time-domain simulations are also performed to confirm the analysis and operation with a power converter. Design guidelines have been summarized for the quest for machine topologies with high power density or high torque capability. A prototype of the machine had been designed, built and tested with a closed-loop drive system based on DSP technology. The test results of the system are compared with the estimations. It is found that the machine offers larger torque capability in comparison with traditional commercial induction machines and brushless permanent magnet machines.