Simplified Analytical Optimization and Comparison of Torque Densities Between Electrically Excited and Permanent-Magnet Machines

摘要: This paper presents the simplified analytical optimization and comparison between electrically excited (EE) permanent-magnet (PM) machines in terms of torque per volume T/V weight T/G for low-speed applications when their copper loss overall size are same. Analytical models both individually developed optimized to obtain optimal flux density ratio, split maximum densities. Furthermore, variation optima with number poles machine is also investigated. The analyses validated by finite-element experiments. It concluded that densities PM can be more than √2 times higher those EE machines. For machines, there an pole maximize densities, large preferred. In actual applications, likely compromise meet thermal constraints. shows designs have significantly ratio cost- weight-effective designs.