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The unbalanced magnetic pull (UMP) often occurs in different kinds of electrical machines. In induction motors, UMP is usually caused by air-gap eccentricity, which is generally divided into static eccentricity, dynamic eccentricity, mixed eccentricity, and inclined eccentricity, also known as rotor misalignment. However, it has been verified that the curved dynamic eccentricity always occurs to some...
According to the problem of immeasurable working temperature of submersible motor, it established three-dimension finite element model of part of rotor iron core and half a rotor bearing in rotor three-dimension temperature field. The convective heat transfer coefficient between the lubrication oil in air gap of motor and rotor surface , oil of hollow shaft's were got by the heat transfer and fluid...
In this paper, the magnetic field distributions of a variable flux memory motor with different rotor permanent magnet (PM) shapes under no-load and d-axis demagnetization are analyzed by finite element method (FEM). A detailed description on the changes of bypass flux and zero flux density area in the rotor is given. The influence of PM shape on the field-control parameters of the motor, such as the...
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