Finite Element Analysis And Experiment Research On Harmonic Torques Of Permanent Magnet Motors With Solid Rotor

Steady-state harmonic torque and its influencing factors are mainly studied in this thesis. Taking a 22kW permanent magnet solid motor for example, time-stepping finite element method is adopted to calculate the magnitude and components of harmonic torque under no-load and full-load conditions and its mechenism is analyzed in theroy, at the same time, the influence of different time step and meshing density on calculation results are also compared. On this basis of the above, the influencing factors of harmonic torque, such as asymmetric airgap, different rotor materials and core structure are deeply studied. At last, the experimental study, with no-load and full-load condition, is implemented, and some special problems are analyzed in detail. The result can be referenced for the design of novel line-start permanent magnet motor.