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This paper aims to model and analyze the torque ripple induced by the spatial harmonics in a brushless DC (BLDC) motor. At first, a general mathematical model of BLDC motor is introduced, which assumes an ideal trapezoidal back-EMF. Afterwards, the improved back-EMF model including the spatial harmonics is derived using mathematical equations. Back-EMF tests are conducted on a laboratory BLDC motor...
In Surface Permanent Magnet (SPM) Synchronous machines with fractional slot concentrated windings (FSCW) configuration, few slot/pole combinations exhibit large spatial harmonic and sub-harmonic fields. Spatial harmonics result in distorted voltage waveforms and cause additional losses thereby deteriorating the machine's performance. From background literature, it has been found that these harmonics...
An induction machine with skewed rotor bars has enhanced starting performance and reduced current harmonic distortion. In a conventional skewed induction machine (IM) modeling, the axial magnetic flux variation is usually ignored in machine performance analysis in spite of significant parameter variation in the axial direction. Furthermore, the selection of optimal skew angle is vital to keep the...
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