Abstract
A novel rotor structure for a tooth-coil-winding (concentrated winding) open-slot axial-flux permanent-magnet (PM) machine that reduces the eddy currents and increases the main flux linkage is proposed in this paper. A composite-body-based rotor assembly and a steel-laminated layer inserted on top of the magnets are used to reduce eddy-current losses in the PMs. A prototype of an axial flux generator for a heavy-duty vehicle following this structure is optimized, analyzed and measured. The tooth coil windings produce high-amplitude harmonics in the air gap and the large slot openings reduce the rotor flux. Consequently, a rotor structure that decreases the amount of harmonics travelling through the magnets is required. Steel laminations covering the magnets have positive effects on both phenomena. Two-dimensional and three-dimensional finite-element analysis is used to verify and optimize the geometry of the laminations. Computations are verified by experimental measurements of a 100 kW test machine prototype.
| Original language | English |
|---|---|
| Article number | 7442573 |
| Pages (from-to) | 4729-4737 |
| Number of pages | 9 |
| Journal | IEEE Transactions on Industrial Electronics |
| Volume | 63 |
| Issue number | 8 |
| DOIs | |
| State | Published - Aug 2016 |
| Externally published | Yes |
Keywords
- Axial flux (AF) machines
- Tooth coil windings (TCWs)
- eddy currents
- finite-element analysis (FEA)
- magnetic losses
- permanent-magnet machines
- rotor losses
- synchronous machines