Modeling And Simulation Of Squirrel - Cage Magnetic Suspension Induction Motor And Its Optimum Design

Bearingless Motor is a new motor type. Without mechanical bearing, it can eliminate the mechanical friction when the rotor rolling. It can overcome the disadvantages of the high speed, ultra-high speed motor, such as huge mechanical loss,high temperature and instability. It can apply to a lot of fields.This paper mainly study the Induction Bearingless Motor with Squirrel Cage Rotor. Unlike the permanent magnet rotor which has a stable rotor magnetic field, the magnetic field in Squirrel Cage Rotor is produced by electro-magnetic induction. It has huge coupling relationship between the rotor Squirrel Cage and the stator coils. Thus, the structure of the motor is significant. At first this paper analyze the produce and the change of levitation force in theory.Than it introduce the theory of electromagnetic field analyzes through the Ansys method, and the process of modeling and simulation by using the Ansys Maxwell.Through the Ansys Maxwell built the 2D and 3D models of a In Induction Bearingless Motor with Squirrel Cage Rotor. In order to compare, the structure of slot and coil of rotor and stator is not change. Then, the paper built some motor models and did some simulations in different aspects, including the Squirrel Cage bar number, stator and rotor’s thickness, air gap’s width and the rotor skewed slots. In these models, the paper simulated their torque and levitation force in both size and stability. It can provide some reference in Bearingless Motor design.