Axial segmentation and magnets losses of SMPM machines using 2D FE method

Permanent-Magnet Eddy-Current Losses: A Global Revision of Calculation and Analysis

“…Fir the same purpose, to compensate the end-effect neglected in 2D FEA, another correction factor was proposed in [107]:…”

Limitations/capabilities of electric machine technologies and modeling approaches for electric motor design and analysis in plug-in electric vehicle applications

“…This assumption is acceptable for ferrite magnets because their conductivity is very low. However, due to the stator slotting effect, spanning a fractional pole-pitch, stator MMF and space harmonics, a significant eddy current loss may be induced in the rotor back-iron and the PMs which have higher conductivity, and much more sensitive to temperature variation [15,89,91,162,163]. Although eddy current loss inside the PMs may decrease efficiency, it will result in a substantial temperature rise inside the PMs.…”

“…Owing to non-overlapping coils, the phases are physically separated with negligible mutual inductance between windings, thus CW is tolerance to interphase faults. However, the magnetic field of these windings has more space harmonics which rotate at different speeds, leading to undesirable effects, such as localized core saturation, eddy current loss in the PMs and rotor back iron, vibration and acoustic noise [90][91][92][93][94][95]. The use of FS distributed windings generates lower cogging torque, because periodicity is eliminated between slot and poles; they produce a more sinusoidal EMF.…”

Analysis and Reduction of Magnet Loss by Deepening Magnets in Interior Permanent-Magnet Machines With a Pole/Slot Ratio of 2/3

“…An alternative calculation method in [9], which used the method of quasi-static magnetic field calculation with different boundary conditions to turn time domain problem to computations in different frequencies, is adopted to verify the PM losses in this paper. Using the frequency domain analysis, the PM loss due to each MMF space harmonic can be further divided.…”

“…Using the frequency domain analysis, the PM loss due to each MMF space harmonic can be further divided. In fact the method in [9] is more suitable for SPM machines, since the saturation and magnetic path are more complex in the rotor core of an IPM machine. For the IPM machine this paper employs frozen permittivity (FP) approach to model the permittivity of the rotor.…”