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Optimization Design of Bearingless Synchronous Reluctance Motor
In order to overcome common drawbacks of the low
torque density and power factor for conventional bearingless synchronous reluctance motors (BSynRMs), a novel BSynRM rotor
structure with ferrite magnets is designed in this paper. First, the
basic structure and operation principle of the BSynRM are introduced, and the mathematical models of torque and suspension
forces are deduced. Second, based on the finite element analysis
method, the parameters of flux barriers layer, rotor rib width, and
permanent magnets are optimized to increase the salient pole ratio
and the difference between d and q axes inductance. Third, the
performance of torque, suspension forces, and power factor for the
optimized motor is compared with that of the traditional BSynRM.
The research results show that the torque density and power factor increase about 54.4% and 56.3% respectively at optimal angle,
whereas the average suspension force decreases about 15.7% owing
to magnetic saturation. The optimized motor is validated to have
good suspension and speed regulation performance.
2018-05-10
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