Abstract
The paper gives detailed systematic researches on the mechanism and key factors of eddy-current losses in rotor magnets of high power-density permanent magnet synchronous motors(PMSMs). Firstly, this paper establishes quantitative mathematic model of eddy-current losses for surface-mounted PMSM based on eddy current field model and Maxwell equations. Then, a scaling index is put forward to weigh the key factors relevant to the eddy-current losses in magnets. At the same time, the principles of eddy-current losses in prototype PMSM are analyzed by the finite element analysis (FEA) software. The contents researched in the paper have practical reference values for design and reliability analysis of PMSMs.
Highlights
Nowadays, permanent magnet synchronous motors (i.e. PMSMs) have become one researching hotspot in the electric vehicle and other high power-density fields, for the advantages of high power density, simple structure, high energy-efficiency, and of long-life operating cycles but low maintaining costs
In order to verify the validation of the analytical formulae, the comparisons between finite element analysis (FEA) and analytical simulations are given in the following under the same conditions. 3.1 Flux Density in the Air-Gap
Q RUGHU WR YDOLGDWH WKH HIIHFWLYHQHVV RI LQGH[ ț comparative researches are carried out for four types of prototype motors based on Equation(4): while 8-pole/9slot is a typical concentrated-winding fractional-slot (CWFS) PMSM; 8-pole/12-slot is a distributed-winding fractional-slot (DWFS) PMSM; 8-pole/24-slot is a q=1(q is slots per-pole per-phase) integral-slot PMSM; and 8pole/48-slot is a typical distributed-winding integral-slot (DWIS) PMSM
Summary
Permanent magnet synchronous motors (i.e. PMSMs) have become one researching hotspot in the electric vehicle and other high power-density fields, for the advantages of high power density, simple structure, high energy-efficiency, and of long-life operating cycles but low maintaining costs. Literature [2,3,4,5] investigate the eddy current loss based on the finite element analysis, especially the influence of segmentation in magnets. The analyses lack the support of theories and relative analyses are carried out based on the uniformly alternating magnetic field which do not consider the asymmetric distribution and influencing weight of different harmonics. A scaling index is put forward to weigh the key factors relevant to the eddy-current losses in magnets. The principles of eddycurrent losses in prototype PMSM are analyzed with the finite element analysis software
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