Title: Magnetic Design of a Flux Leakage Assembly for Pipes
Abstract:For good sensitivity to discontinuities in pipes, a magnetic flux leakage assembly should strongly magnetize the pipe wall. In this paper, a proposed design for a magnetic flux leakage magnetizing ass...For good sensitivity to discontinuities in pipes, a magnetic flux leakage assembly should strongly magnetize the pipe wall. In this paper, a proposed design for a magnetic flux leakage magnetizing assembly is modeled using conventional magnetic circuit models and finite element analysis. Variations on the initial design are tested according to how strongly they magnetize the pipe wall. Some design changes, such as increasing the dimensions of the magnet and adding brushes to the pole pieces, were found through finite element analysis to give no improvement, contrary to expectations based on the circuit model. The inaccuracy of the circuit model was mainly due to the difficulty of calculating the amount of flux in the air outside the pipe. Finite element analysis results indicated that the biggest improvement to the magnetic flux leakage assembly was obtained by adding opposing magnetizing assemblies to each end of the primary assembly. Finite element analysis has proved itself an important development tool because it allows calculation of fields for configurations that are difficult to model with a conventional magnetic circuit.Read More
Publication Year: 2005
Publication Date: 2005-03-01
Language: en
Type: article
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Cited By Count: 1
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