Abstract
This paper presents calculation and measurement results of a highperformance permanent-magnetic gear. The analyzed permanent-magnetic gear has a gear ratio of 5.5 and is able to deliver 27 N.m. The analysis has shown that special attention needs to be paid to the system where the gear is to be installed because of a low natural torsion spring constant. The analyzed gear was also constructed in practice in order to validate the analysis and predict the efficiency. The measured torque from the magnetic gear was only 16 N-m reduced by the large end-effects. A systematic analysis of the 1055 components in the magnetic gear is also performed in order to figure out why the efficiency for the actual construction was only 81 %. A large magnetic 1055 component originated in the bearings, where an unplanned extra bearing was necessary due to mechanical problems. Without the losses of magnetic origin in the bearings and jess end-effects caused by relative ly short stack, an impressive efficiency estimated at 96% can be obtained. Comparison with c1assical mechanical gears has shown that the magnetic gear has a bette r efficiency and a comparable torque per volume density. Finally, it is concluded that the results in this paper may help to initiate a shift from mechanical gears to magnetic gears
| Original language | English |
|---|---|
| Journal | IEEE Transactions on Industry Applications |
| Volume | 41 |
| Issue number | 3 |
| Pages (from-to) | 764-770 |
| Number of pages | 7 |
| ISSN | 0093-9994 |
| Publication status | Published - 2005 |
Keywords
- end-effects
- finite-element analysis (FEA)
- gearbox
- high torque density
- magnetic gear