This work explores for the best solution between design parameter of SPM motor with the motor phase current, back emf waveform, and cogging torque for a minimum torque ripple, a minimum total harmonic distortion of phase current, and as a result, a maximum efficiency. An advanced optimization algorithm is designed to optimize a multi objective function which covers the desirable goals.
A physic-based phase variable model is used to relate and connect the SPM motor design parameter to drive circuit. A mixed Genetic-particle swarm algorithm is developed and it is used as an optimization tool.A closed form equation was used to determine the width/length ratio of magnets.A discrete search space was used to accelerate the optimization task.Performance measures as well as magnet and copper volumes are optimized.
Physics-Based PM Machine Block Diagram
Optimized Performance and Dimensions