| Zusammenfassung: |
Active magnetic bearings as well as bearingless motors have begun to be widely used in industry. For many potential industrial applications, however, they are still too expensive. This paper presents a new concept of a bearingless single-phase motor that leads to a considerable reduction of mechanical and electronical expenditure. Normally two motor/bearing parts are required for a full stabilization of the rotor position. However for selective applications, where the length of the stator can be short with respect to its diameter, it is possible to stabilize three degrees of freedom passively. Only three degrees of freedom need to be stabilized actively. A further simplification of the mechanical and electrical design will be obtained when the carrying windings are integrated into a single-phase motor and concentrated full pitched windings are used instead of distributed windings. This type of bearingless motor can be used in any case where there is no demand of a high starting torque. Possible fields of application are fluid pumps, fans or blowers with special requirements on speed range, lifetime or tightness. |
