Current-based detection of eccentric load coupled to brushless DC motor

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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 of the inverse of torque constant at a low speed. The proposed method is very useful to estimate the amount of eccentric load using the stator current.

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