Bearingless induction motors
Akira Chiba
In this chapter the bearingless induction motor (or induction type bearingless motor) is introduced. In a squirrel cage induction machine, short-circuit paths are constructed in the rotor iron from cast aluminium or fabricated copper in a cage-like structure. The revolving magnetic field set up by the stator winding currents induces voltages in the rotor circuit producing current. Since there is a phase shift between the rotor current and stator field, a torque is generated due to the interaction of the rotor current and the revolving magnetic field. However, in a bearingless induction motor the rotor current causes interference in the suspension force generation if the rotor circuit is not constructed ...
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