Wolfgang Gruber, Patrick Enengl, Maxim Sokolov,
"Design and Measurement of a 6-phase Combined Winding Bearingless Synchronous Reluctance Slice Motor"
: ASPE 2020 Spring Topical Meeting - Design and Control of Precision Mechatronic Systems, Boston, USA, 5-2020
Design and Measurement of a 6-phase Combined Winding Bearingless Synchronous Reluctance Slice Motor
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ASPE 2020 Spring Topical Meeting - Design and Control of Precision Mechatronic Systems, Boston, USA
Bearingless (or self-bearing) motors combine torque and suspension force generation in one common unit . Over the time, nearly all standard drive topologies also got their bearingless counterparts, generating radial suspension forces to stabilize the rotor radially inside stator and allowing contact-free and, hence, wear-less operation. Using combined winding systems and disk-shaped rotors led to very compact bearingless motors. A combined winding is able to generate both, drive torque and suspension forces, while a separated winding creates either torque or force . Combined windings are easier to manufacture, need less space and feature lower copper losses, but demand a more complex control scheme to decouple force and torque generation. A disk-shaped rotor allows to stabilize certain degrees of freedom (the axial deflection and the two tilting directions) passively, when the magnetic air-gap field is properly biased . Such bearingless slice motors are typically used with a rotor impeller wheel in ultra-pure pump and mixing applications in the semiconductor, biomedical or pharmaceutical industry.