Modeling and Simulation of Rim-Driven Thruster Permanent Magnet Motor-Sheath-Dielectric System
In order to reduce the eddy current loss of the permanent magnet motor of the rim thruster,study the influence of the sheath material and thickness on the eddy current loss of the permanent magnet motor,based on the finite element electromagnetic analysis software ANSYS Electronics Desktop,establish the motor-sheath-dielectric system model,and verify the model accuracy by comparing the simulation results with the conclusion of the numerical calculations;calculate the stator-rotor sheath of the permanent magnet motor,calculate the eddy current density distribution of permanent magnet,and analyze the influence of the sheath material and thickness on the eddy current loss.The results show that:the eddy current density in the sheath is much larger than that in the permanent magnet when the conductivity of the sheath material is higher,and the size of the two is similar when the conductivity is lower;the eddy current loss generated by the motor is much smaller than that by the sheath material with higher conductivity when the sheath material with lower conductivity is used;the sheath material has a greater influence on the eddy current loss per unit volume of the sheath,and a smaller influence on the permanent magnet;the thickness ratio of the stator-rotor sheath is positively correlated with the eddy current loss generated;as the thickness ratio of the sheath increases,the eddy current density in the sheath becomes higher,and the eddy current density in the permanent magnet becomes lower.Positive correlation;as the thickness ratio of the sheath increases,the use of lower conductivity of the sheath on the permanent magnets and the sheath unit volume eddy current loss has less impact,and higher conductivity of the sheath because of the shielding effect can be reduced by reducing the eddy current density of the permanent magnets to reduce the permanent magnet eddy current loss;changes in the air gap medium in the air,fresh water,sea water,the motor's magnetic flux density distribution does not have a significant effect.The research results can provide a reference for the design of permanent magnet motor sheaths for rim thrusters.
rim thrusterpermanent magnet synchronous motorfinite element methodsheatheddy current loss