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Genetic algorithm based design optimization of a permanent magnet brushless dc motor J. Appl. Phys. 97, 10Q516 (2005); 10.1063/1.1860891Comparison of performance of the axial-field and radial-field permanent magnet brushless direct current motors using computer aided design and finite element methods J. Appl. Phys. 97, 10Q506 (2005); 10.1063/1.1853239Effect of maximum torque according to the permanent magnet configuration of a brushless dc motor with concentrated winding Influence of the permanent magnet overhang on the performance of the brushless dc motor This paper proposes the novel flux barrier by using the modified Taguchi method to reduce the cogging torque. In the optimizing process the modified Taguchi method is utilized to consider multiple objective quality characteristics simultaneously such as the torque ripple and the efficiency as well as the cogging torque. The optimal novel flux barrier can effectively reduce the cogging torque and torque ripple and it is verified through the experimental results.

Articles you may be interested inEffect of rotor eccentricity on electric parameters in a PM brushless motor with parallel winding connections J. Appl. Phys. 105, 07F121 (2009); 10.1063/1.3076420The torque ripple reduction of a concentrated winding synchronous reluctance motor according to stator and rotor structure variations using response surface methodology J. Appl. Phys. 103, 07F133 (2008); 10.1063/1.2839348Effect of skewing the rotor teeth on the performance of doubly salient permanent magnet motors A comparative analysis of permanent magnet-type bearingless synchronous motors for fully magnetically levitated rotors This paper proposes an optimized rotor pole shape that can effectively reduce the partial demagnetization effect and cogging torque. First, for reducing the peak amplitude of the external field that directly affects the partial demagnetization on the permanent magnets in spoke-type permanent magnet motor, we conduct a variation of core shape and insertion of a barrier. Second, with the rotor shape obtained by the first processes for reducing the partial demagnetization effect, another part of the rotor pole is varied to make better sinusoidal distributed air gap flux density to reduce the cogging torque. In the process of designing the rotor pole shape, a steepest descent method and a response surface method are applied for improving convergence. By using the finite element method, we show that the optimized rotor pole shape drastically reduces the effect of the partial demagnetization and cogging torque.

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This paper introduces a rotor core in an interior permanent magnet type brushless DC motor. The rotor core consists of a rotor surface having a non-uniform air gap and a novel magnetic flux barrier. We show that, in the rotor core, the rotor surface having the non-uniform air gap effectively reduces the cogging torque while the optimized magnetic flux barrier reduces the cogging torque, and increases the average torque and the efficiency.