Along with the increasing electric load in the mobile, the request of the mobile electric system is increasing as well. Today, the standard output voltage of the claw alternator in the mobile is 12V or 24V. The performance and efficiency of the traditional claw alternator in the mobile cannot meet with the increasing request of them anymore. In addition to actively develop the new claw-pole alternator, try hard to improve the performance and efficiency of the traditional motor by optimizing the parameters is a solution to the problem of efficient and economic means. This paper will calculate the basic mathematical claw alternator model of the 14V machine. Based on it, have the machine’s structural parameters analyzed and optimized, making the operating performance as high as possible on the basic size of the motor in the original.
A changing air gap permeance model of the alternator and its influence were discussed in this paper. When the alternator was under high-speed operation, taking it into consideration that the claws getting deformation for rotating centrifugal force and electromagnetic exciting force, the alternator’s changing air gap permeance model was established. And the alternator’s Maxwell3D calculation model was built. The field magnetic distribution under the rated speed was obtained as well, also before the claws’ deformation was obtained. The harmonics of the air-gap flux were analyzed and compared. The changing air gap permeance model was proved to be reasonable. It would lead to air-gap magnetic field distortion of the generator, which affected the generator’s electromagnetic properties. Instruction was provided for more precise of air gap magnetic field analysis or vibration noise analysis of alternator.
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