Abstract

Axial type magnetically suspended motor, which does not have bearings of a motor shaft, has been developed. The developed motor consists of a top stator, a levitated rotor, and a bottom stator. The top stator has four permanent magnets to produce upward directional bias magnetic force to the rotor. The top stator also has two pairs of electoromagnets to control the radial position of the levitated rotor. The bottom stator has two sets of coils. A set of the coils produces the attractive force to control the axial position of the levitated rotor and produces the rotating torque of the levitated rotor. The other coils is used to control the inclination of the levitated rotor. A magnetically suspended centrifugal pump was constructed with the developed motor. A closed-loop circuit filled with the water was connected to this pump to examine performance of the pump and the magnetic suspension system. Maximum rotational speed, flow rate and pump head were 1100rpm, 4.3l/min and 48.6mmHg, respectively. The developed pump indicated the potential to be an artificial heart with further improvement.

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