Abstract
In this study, the authors presented a systematic design procedure of outer rotor bearingless synchronous reluctance motor (SynRM). The proposed motor is compared with an already prototyped inner rotor bearingless SynRM at different operation points. It has been shown that a properly designed outer rotor SynRM can produce higher levitation forces than the inner rotor counterpart. The inner rotor motor produces higher torque and eccentric forces than the outer rotor motor.
Highlights
A bearingless synchronous reluctance motor (BSynRM) is an integration of the active magnetic bearing and a traditional synchronous reluctance motor in the same unit
The inner and outer rotor configuration of the bearingless SynRM are compared on different operational characteristics
It has been found that the torque of a reluctance motor has a better profile in the inner rotor structure than in the outer rotor structure
Summary
A bearingless synchronous reluctance motor (BSynRM) is an integration of the active magnetic bearing and a traditional synchronous reluctance motor in the same unit. Controlling the electromagnetic forces can cancel the gravity acting on the rotor and the shaft, and allowing the necessary levitation for the bearingless operation. This type of machine topology is beneficial in the high-speed applications [2] and in specific applications where the rotor and the stator cannot have any physical contact [3]. Designing an outer rotor reluctance motor is not straightforward as the torque is only a function of the reluctances difference of the d and q-axis of the rotor, which is influenced by the airgap diameters and the flux barriers [5]. A systematic design approach is presented, which can be used for designing an outer rotor normal and bearingless SynRM
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