The magnetic properties of the claw pole have a direct effect on the output power of a generator. Many methods can be used to measure these magnetic properties, each with its own advantages, but an important shortcoming is that all are destructive. In this study, a new non-destructive method to measure the magnetic properties of claw pole was proposed and a corresponding testing setup was designed. A finite-element model was constructed to simulate the measurement process. Results proved that the measured magnetization-like curves had good agreement with the trend of the input magnetic curves and the effect of the positioning error in the measuring process could be neglected. To further validate the new method, seven types of claw poles of different materials subjected to different heat-treatment processes were forged and tested by both the new method and the conventional ring-sample method. Compared with the latter, the new method showed better consistency, relatively higher accuracy, and much stronger stability of measurement results; however, its sensitivity needs to be improved. The effects of material compositions and heat-treatment parameters on the magnetic properties of the claw pole were briefly analyzed.
High power-generation efficiency can be achieved by optimising the shape of the claw pole used as automobile generators. The working process of the stator and rotor in the claw pole generator was simulated using the finite-element method. First, one of the eight typical claw pole types commonly used in industry was selected. Then, orthogonal optimisation was performed based on the simulation results, yielding an optimal claw shape design. To examine the adaptability of the designed claw pole to shape change, the non-destructive test for evaluating the magnetic properties of claw pole (NDTEM) was employed. Finally, a claw pole with an optimal shape was forged, and its magnetic induction intensity was assessed using the NDTEM. The results indicated that compared with the unoptimised claw pole, the magnetic induction intensity of the optimised claw pole increased by a maximum of 8.11% and its weight reduced by 4.86%. This optimisation effectively improved the efficiency of power generation and achieved the lightweight of the claw pole.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
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