Bearingless Segment Motor With Five Stator Elements—Design and Optimization

Gruber, Wolfgang; Amrhein, Wolfgang; Haslmayr, M.

doi:10.1109/tia.2009.2023560

Cited by 82 publications

(17 citation statements)

References 3 publications

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“…This motor features five coils and therefore demands an inverter with five half-bridges [8]. The power electronic effort is increased, but the operation behavior is improved significantly compared to the motor with four stator segments (nearly no cogging torque is perceivable and no single phase characteristic is present in the overall torque generation).…”

Section: Five Stator Elements and Surface Mounted Rotor Magnetsmentioning

confidence: 99%

Design variants of the bearingless segment motor

et al. 2010

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Bearingless drives and magnetic bearings allow the construction of contactless, wearless and lubrication-free rotating systems. Utilizing a permanent magnet excited rotor disc permits the passive stabilization of three degrees of freedom (tilting and axial deflection) by reluctance forces. Hence, using these bearingless slice motors it becomes possible to design very compact magnetically suspended drive systems. The bearingless segment motor is a subtype of the bearingless slice motor, where the stator consists of single elements. As a matter of fact, all these stator segments are magnetically decoupled from each other. This article introduces different designs of the announced bearingless segment motor featuring different rotor and stator compositions. Especially the differences in the generation of bearing forces are outlined. The special features of the various considered drives are examined and their advantages and drawbacks are discussed. Finally these motors are compared qualitatively by different criteria (like the demands on power electronics, passive stiffnesses or bearing force and motor torque capacity).

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Section: Five Stator Elements and Surface Mounted Rotor Magnetsmentioning

confidence: 99%

Design variants of the bearingless segment motor

et al. 2010

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“…2 shows different rotor topologies. In [1] and [2] segment motors with surface mounted magnets respectively buried magnets are presented and their characteristics are demonstrated. For some applications the outer geometrical dimensions of the cross section are fixed and for this reason it is essential to design the motor assembly with respect to a large inner diameter respectively a low mass moment of inertia of the magnetic parts of the rotor.…”

Section: Considered Segment Motor Topologymentioning

confidence: 99%

Bearingless segment motor with Halbach magnet

et al. 2010

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Today magnetically levitated rotors are mainly used in applications where wearless operation and high life cycle are of importance (e.g. in the pharmaceutical, biomedical, chemical and semiconductor industry). The bearingless slice motor features a very compact design because three degrees of freedom (one translational and two rotatory) are passively stabilized by reluctance forces. Therefore, only two translational degrees of freedom remain to be actively controlled. This paper introduces a new bearingless segment motor (a subtype of the bearingless slice motor) featuring a Halbach magnet ring mounted on the rotor. Thus, no back iron is needed on the rotor and therefore the overall weight of the permanent magnet excited disc-shaped rotor is reduced to a minimum.The bearing forces which can be created by one optimized stator segment are calculated analytically. These results allow conclusions for the total force locus. A prototype is built and measurements verify the results of the analytic considerations.

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“…However, in the case of 5DOF bearingless motor, high cost and large motor size are unavoidable, because five displacement sensors and amplifiers, three units of a three-phase inverter and one single-phase inverter are needed. For reducing cost a motor with active positioning of two degree-of-freedom has been studied and applied in the semiconductor industry [1]- [4], [8] and [lO]. In [ 17].…”

Section: Introductionmentioning

confidence: 99%

Winding arrangement in single-drive bearingless motor with radial gap

Sugimoto

Tanaka

Chibá

et al. 2014

2014 International Power Electronics Conference (IPEC-Hiroshima 2014 - ECCE ASIA)

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A novel single-drive bearingless motor with high passive stiffness and wide gap factor has been proposed.The single-drive bearingless motor has only one set of three phase windings. It generates both torque and axial suspension force independently with only one three-phase inverter and one displacement sensor. Therefore, the single drive bearingless motors have the advantages of low cost and small size. Only axial direction z-axis is actively positioned. The other axes, radial movements x and y, and tilting movements ex and �" are passively stable by repulsive passive magnetic bearings. The stator consists of six C-shaped cores and one set of three-phase windings. A novel V-shaped winding structure is proposed to generate the torque and active axial force simultaneously. In this paper, the winding arrangement is presented. In addition, the mathematical calculation is carried out.

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Bearingless Segment Motor With Five Stator Elements—Design and Optimization

Cited by 82 publications

References 3 publications

Design variants of the bearingless segment motor

Design variants of the bearingless segment motor

Bearingless segment motor with Halbach magnet

Winding arrangement in single-drive bearingless motor with radial gap

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