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Underwater Motor Sealing Based on Magnetic Force Coupling

According to the requirements of sealing a deepwater motor on an underwater device, the overall structure of the magnetic-driven sealer is designed, and its magnetic structure is determined in this paper. The arrangement of magnet is researched and determined, a reasonable aspect ratio of the magnetic circuit is chosen as well. The problem of reasonable matching between thickness of permanent magnet and the arc of active surface of magnetic pole is analyzed, and the operating point of permanent magnetic materials is determined. The torque of magnetic circuit is calculated, the power matching and correction are studied, and the design and calculations of the torque of magnetic-driven sealer are completed, and the dimension of the overall structure is designed. Permanent magnetic materials, soft magnetic materials, yoke steel material and the materials of isolated sets are analyzed, respectively, and at last reasonable materials are chosen. Moreover, the design of isolated sets is accomplished, and the loss of eddy current and the hydraulic friction, existing on magnetic-driven sealer, are analyzed and calculated. Based on the calculation of analytical method and by using software of ANSYS, the magnetic circuit of magnetic-driven sealer is simulated and analyzed. The magnetic field distribution of model is analyzed when the angle difference, the number of the magnetic poles or thickness of yoke steel is changed, respectively. In conclusion, the simulation results are consistent with the theoretical calculation.