Characteristics and Performance Analysis of a Permanent-Magnet Motor with a Multistacked Imbricated Rotor

The paper studies the parameters and performance of a motor with a multistacked imbricated permanent magnet rotor. An experimental motor with ferrites for excitation is used in the investigation. Methods used in the determination of the parameters, Xd, Xq and the core-loss component, Rc, are described. Their variation with load and terminal voltage are also discussed. These parameters are applied in a model based on the classical two-axis machine theory for performance analysis. Detailed investigation shows that the reactance characteristics under steady-state conditions are similar to a wound rotor machine. Computed results using these values of Xd, Xq and Rc show agreement with experimental results. The significance of Rc is noted.