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This research mathematically derives the frequency equations of back electromotive force (BEMF), cogging torque and unbalanced magnetic force (UMF) of a brushless DC (BLDC) motor due to unevenly magnetized permanent magnet (PM). The proposed mathematical equations are experimentally validated by comparing with the measured BEMF, cogging torque and UMF of a hard disk drive (HDD) spindle motor with...
This research mathematically derives the frequency components of back electromotive force (BEMF), cogging torque and unbalanced magnetic force (UMF) of a hard disk drives (HDD) spindle motor with 12 poles and 9 slots (12P9S) due to unevenly magnetized permanent magnet (PM). Only 3-multiple harmonics originated from uneven magnetization of PM introduces same frequency components to BEMF and slot-multiple...
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