To control sensorless type Brushless DC (BLDC) motors, various back Electromotive Force (EMF) detecting methods have been widely used. In this research, a Finite Elements Method (FEM) model of an 8 pole 12 slot BLDC motor and two kinds of phase-voltage sensing back EMF detecting electrical circuits are coupled to achieve improved and more reliable analysis results. Through this coupled analysis, it becomes possible to analyze the characteristics of the motor and how the electrical circuit affects the motor at the same time. This makes it possible to design high performance embedded motor controllers in the future. An experimental evaluation of the coupled analysis results was also implemented to verify the coupled analysis.
This paper proposes a novel asymmetrical interior permanent magnet (IPM) brushless DC (BLDC) motor structure, which utilizes half-type permanent magnet (PM) configuration and has asymmetrical side gaps (slot next to the PMs) for reducing torque ripples. This structure uses 24% less volume of PMs than conventional IPM BLDC motor with a full set of magnets. The characteristics of the proposed motor are compared with three other half-type IPM BLDC motors through finite elements method (FEM) analysis, and the usefulness of the proposed motor was verified through experimental evaluation on prototypes of the conventional motor and proposed motor under various torque load conditions. This research obtained a high-performance IPM BLDC motor while decreasing manufacturing cost at the same time.
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