Abstract
The paper deals with the electromagnetic forces in
induction machines when the rotor is performing eccentric
motion with respect to the stator. The studied eccentric
motions of the rigid cage rotor are cylindrical circular
whirling motion, symmetric conical whirling motion and
the combination of these two basic modes of eccentric
motions.
The multi-slice, time stepping finite element analysis is
used for solving the magnetic field, and the forces are
calculated from the air gap by a method based on the
principle of virtual work. The forces are measured for a
test motor equipped with active magnetic bearings. The
active magnetic bearings are used to generate the
eccentric rotor motions and also to measure the
electromagnetic forces. The measured and calculated
forces show relatively good agreement. The results show
that superposition is valid when determining forces. This
means that the calculated forces of different motions can
be combined and the result is the force of the combined
motion.
| Original language | English |
|---|---|
| Title of host publication | 2003 IEEE International Electric Machines and Drives Conference (IEMDC'03) |
| Publisher | IEEE Institute of Electrical and Electronic Engineers |
| Pages | 1616-1622 |
| ISBN (Print) | 0-7803-7817-2 |
| Publication status | Published - 2003 |
| MoE publication type | A4 Article in a conference publication |
| Event | 2003 IEEE International Electric Machines and Drives Conference (IEMDC'03) - Madison, United States Duration: 1 Jun 2003 → 4 Jun 2003 |
Conference
| Conference | 2003 IEEE International Electric Machines and Drives Conference (IEMDC'03) |
|---|---|
| Country/Territory | United States |
| City | Madison |
| Period | 1/06/03 → 4/06/03 |
Keywords
- electrical machines
- cage rotor
- electromagnetic forces
- rotor eccentricity
- impulse method