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The variation characteristics of flux density and field intensity of trapezoidal permanent magnets (PM) in the variable-flux memory motor (VFMM) under different demagnetizing magnetomotive forces are analyzed using the finite element method. A prototype machine is fabricated and tested. Good agreement between the calculated and experimental results is achieved. It confirms the easy controllability...
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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