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This paper proposes a novel topology optimization method to optimize the material distribution of electrical machines using the genetic algorithm (GA). In the proposed method, a cluster of material and the cleaning procedure are taken into account in order to form a group of iron and a group of air. Moreover, the GA is iterated with the newly increased length of genes. The proposed method is applied...
This paper proposes a new diagnosis method for the eccentric load coupled to a brushless DC motor, which utilizes the amplitude of two-phase current. The experiment verifies that the Fourier analysis and the Wavelet analysis of the amplitude of two-phase current are effective. Especially, the Fourier analysis of the amplitude of two-phase current is proportional to the load torque with the coefficient...
It is necessary to estimate the initial rotor position accurately when the sensorless control is applied to brushless DC motor. First, we explain the estimation method of initial rotor position. Next, we investigate the influence of the amplitude and frequency of high-frequency input voltage on the estimation accuracy and obtain the optimal values. The brushless DC motor can start smoothly by using...
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