Finite Element Analysis And Research On PM Motor Rotor Mechanical Design

The mechanical calculation and design on PM motor is always performed after electrical design .In order to match the electrical design, the size is usually designed so weak that the motor can not work normally .This paper concerns a mechanical invalidation of rotor on a motor .Through the 2-D finite element analysis on the rotor of the PM motor, some valuable results are gained.Five parts of this thesis are included as follows:At first, the theories of elasto-plasticity including mises yielding criterion, loading condition are presented as the basic theories.Second, the application of FEM are stated, including the basic method and the basic analysis process as well as the variation principle and Ritz method. Some formulas of; numerical analysis on elasto-plasticity mechanics are also deduced here.Third, some of the basic concepts and principles relating to contact finite element analysis are presented. On the basis of the known research on the intensity of the rotor, the nonlinear contact finite element analysis is suggested. The analysis process and basic theory on FEA are importantly stated as the guideline to make the solve of analysis more approximately to the real case.Forth, the static analysis finite element models of a rotor including nonlinear contact are set up by understanding the underlying theory. Based on the FEA software ANSYS, the rotor's stress and radial shift are acquired by 2-D coupled-filed FEM, with the consideration about coupled electromagnetic-mechanical problems. The improvement of rotor is also obtained from the analysis.At last, an experiment is designed to proof the FEA to be reliable.