Abstract
The external magnetic field of a single permanent magnet is modeled by the vector magnetic potential method based on the Ampere hypothesis, which is compared with the finite element method to analyze the external magnetic field of the permanent magnet. Based on this, the mathematical models of the external magnetic field of multiple permanent magnets are obtained. By analyzing the external magnetic field of the permanent magnet of an electromagnetic ultrasonic probe proposed in this paper, the influence of the parameters of the permanent magnet on the external magnetic field is studied. The optimized structure containing multiple permanent magnets can increase the vertical component of magnetic field strength by about 32.3% compared with that of a single permanent magnet.
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