Design of High Torque Density Reduced-Rare-Earth Consequent Pole PMBLDC Motor for Ceiling Fan

This paper presents the design of a high torque density, reduced-rare-earth consequent pole permanent magnet brushless DC (CP-PMBLDC) motor for ceiling fan application. The motor torque requirement is selected based on the load requirement (fan-type) in conjunction with mechanical profiling considerations of a blade designed for optimal air delivery. Due to higher torque requirement at low speed, Neodymium-Iron-Boron (NdFeB) magnets are preferred for magnetic excitation and are tested with consequent pole arrangement to reduce PM volume and to maximize PM utilization ratio. Influences of the permanent magnet physical parameters on the performance improvement/deterioration are analyzed in brief, and the best motor topology to satisfy the required loading is selected and assessed.