Abstract
This article investigates the production mechanism of the open-circuit back-electromotive force (back EMF) in fractional-slot concentrated winding permanent magnet (FSCW-PM) machines based on the air-gap field modulation (AFM) theory. The relationship between spatial PM field harmonics and temporal back EMF harmonics is discovered by using a general model, which is suitable for both stator-PM and rotor-PM machines. The analysis results reveal that the FSCW-PM machines produce their open-circuit back EMF on the basis of AFM, which means that each back EMF harmonic is induced not only by a specific single spatial field harmonic but also by several different spatial field harmonics. Furthermore, a general winding factor calculation formula for FSCW-PM machines is derived together with the general calculation formula of all back EMF harmonics. Finally, the analysis is verified numerically by the finite element method and experimentally.
| Original language | English |
|---|---|
| Pages (from-to) | 2658-2670 |
| Number of pages | 13 |
| Journal | IEEE Transactions on Transportation Electrification |
| Volume | 7 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 1 Dec 2021 |
Keywords
- Air-gap field modulation (AFM)
- fractional-slot concentrated winding
- permanent magnet machines
- rotor-permanent magnet (PM) machines
- stator-PM machines
ASJC Scopus subject areas
- Automotive Engineering
- Transportation
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering