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At load operation, suspension control of bearingless motors are became unstable by interference of the motor flux. Therefore, it is necessary to decoupling compensation for stable magnetic levitation. Conventionally, perform the parameter identification test of suspension force by attaching a special jig to bearingless motors. However, conventional method restricted in the shape of the rotor. The...
A novel bearingless switched reluctance motor (BLSRM) with separated torque and suspending force poles is presented. The torque poles are used to generate the torque, while the suspending force poles are used to control the suspending force. Due to independent characteristics between torque and suspending force poles, the torque control can be decoupled from the suspending force control. To verify...
In this paper, two novel bearingless switched reluctance motors (BLSRMs), 12/14 hybrid stator pole BLSRM and 12/8 double stator BLSRM, in which the torque control is naturally decoupled from the suspending force control are proposed. Both structures have two types of stator poles: torque and suspending force poles. Due to the independent characteristics between the torque and suspending force poles,...
A new bearingless motor is presented in this paper. The proposed Axial Force/Torque motor is able to generate axial bearing forces and drive torques concurrently with one common winding system. The end-windings of a concentrated air-core coil winding can produce forces in the axial direction, if the rotor magnet system features a special magnetization pattern, that prevents the cancellation of the...
Bearingless motors are characterized by integration of electrical motors and magnetic bearings. These motors can realize magnetic suspension of rotor shafts without mechanical contacts. If the bearingless motor is applied to a canned motor pump, it is possible to levitate and rotate a impeller and a rotor shaft of a centrifugal pump. Therefore, the bearingless canned motor pump can realize next several...
The paper deals with a classification for bearingless motors with separated 3-phase concentrated drive and bearing windings. Based on fundamental equations of the electrodynamics specific force equations are deduced, in order to develop lateral force properties in rotating machines. Furthermore, a new classification for 3-phase concentrated windings is proposed and adapted to bearingless motor theory...
In this paper, a general research for the design scheme of bearingless motors is presented. Bearingless motors are different from normal motors as both torque and radial forces are generated in one magnetic circuit in bearingless motors. Based on the known design of normal motors the reduction of the utilization factor C by the radial force generation is considered. By an iterative sequence a reduction...
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