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The radial and lévitation forces, necessary to suspend a double conical permanent magnet synchronous rotor, are generated by superposition of the rotor field and two stator fields with one pole pair difference. Due to the superposition of the fields in the air gap, some force interferences are disturbing the levitated drive. The origin of these perturbations are explained and described in a simplified...
Bearingless motors are characterized by integration of electrical motors and magnetic bearings. These motors can realize magnetic suspension of rotor shafts without mechanical contacts. If the bearingless motor is applied to a canned motor pump, it is possible to levitate and rotate a impeller and a rotor shaft of a centrifugal pump. Therefore, the bearingless canned motor pump can realize next several...
Radial force and tangential force, which deform stator core, are the main causes of vibration and noise. There are many methods to minimize such exciting forces by designing of rotor shape. However, modification of rotor shape increase development cost of the motor. Therefore, step skewed rotor is applied to the design in order to reduce exciting force so that both reduction of vibration and noise...
Particular interest is presently focused on the full electric direct propulsion systems for the improvement of reliability and reduction of noise. A transverse flux permanent magnet (TFPM) machine with high pole-number and multi-phase configuration is one of the most suitable designs in such application so far as its high power production potential. In view of practical limitations of space and mass,...
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