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This paper investigates how the orientation of the applied demagnetizing magnetomotive force (MMF) affects the demagnetization behavior of Nd-Fe-B magnets that are widely used for permanent magnet synchronous machines (PMSMs). This work designs and builds a customized test fixture that can produce a magnetic field with varying orientation and intensity to demagnetize magnet samples. A computer-controlled...
Electric vehicles require compact and energy efficient motors with wider operating speed region. Interior Permanent Magnet motors with high saliency ratio are found to be suitable for such applications. However, these motor designs have an intrinsic risk of irreversible demagnetization of the magnets. To maintain air gap flux density more than the remnant flux density of the magnets placed in spoke...
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