Axial Flux Machine Using Passive Magnetic Bearing with Axial Magnetization

AlizadehTir, Milad; Marignetti, Fabrizio; Mirimani, Seyyed Mehdi

doi:10.1109/speedam.2018.8445276

Cited by 2 publications

(2 citation statements)

References 19 publications

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“…A model was developed to determine the magnetic stiffness in radial flux permanent magnet generators of direct-drive wind turbines from the structural mechanical stiffness depending on the verified operation deflection [14]. An axial flux hightemperature superconducting (HTS) motor for aircraft propulsion was designed and analyzed [15]. Magnetic forces and stiffness for an axial flux machine using passive magnetic bearing with axial magnetization were analyzed on wind and hydro low-speed turbines [16].…”

Section: Preprintsmentioning

confidence: 99%

Axial Stiffness Augmentation by Adding HTS Bulks or Limiting PM Rings to a Horizontal Axis HTS ZFC Radial Passive Bearing

Arsénio Costa,

Fernandes,

Costa Branco

2024

Preprint

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This paper analyses the viability of different solutions to passively augment the axial stiffness of a horizontal axis radial levitation passive magnetic bearing (PMB) with topology previously studied. The zero-field cooling (ZFC) of high-temperature superconductor (HTS) bulks promotes higher magnetic impulsion and levitation forces and lower electromagnetic losses than with the field-cooling (FC), but on the other hand, the guiding stability is much lower than with FC. Because of stability reasons, FC was adopted in most superconducting maglev systems. The trend of this research group has been to develop an HTS ZFC horizontal axis radial levitation PMB presenting notable levitation forces with reduced electromagnetic losses, defined by a topology that creates guiding stability. Previous work has shown that even optimizing the bearing geometry to maximize magnetic guidance forces, could not be enough to guarantee the axial stiffness required for many applications. First, the extent to which guidance forces are augmented by increasing the number of HTS bulks in the stator is evaluated. Then, the axial stiffness augmentation by passively adding two limiting permanent magnet (PM) rings is evaluated. Results show that the axial stiffness is highly augmented by adding limiting PM rings with no significant additional investment. This change enables using the studied ZFC superconducting PMB in high-precision axial stability applications, such as precision gyroscopes, horizontal axis propellers and turbines.

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Section: Preprintsmentioning

confidence: 99%

Axial Stiffness Augmentation by Adding HTS Bulks or Limiting PM Rings to a Horizontal Axis HTS ZFC Radial Passive Bearing

Arsénio Costa,

Fernandes,

Costa Branco

2024

Preprint

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“…Some methodologies for increasing the stiffness of levitation systems have been proposed for passive magnetic levitation and bearing devices. In reference [13], the authors propose the use of permanent magnets and magnetic plates to increase the stiffness of an axial flux HTS motor for aircraft propulsion. Axial airgap distances and torque dynamics are given in reference [14], concerning another axial flux HTS motor for aircraft propulsion.…”

Section: Introductionmentioning

confidence: 99%

Axial Stiffness Augmentation by Adding Superconductor Bulks or Limiting Permanent Magnet Rings to a Horizontal Axis Zero-Field Cooled High-Tc Radial Passive Superconducting Bearing

Arsénio Costa,

Fernandes,

Costa Branco

2024

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This paper analyzes the viability of different solutions to passively augment the axial stiffness of a horizontal axis radial levitation passive magnetic bearing (PMB) with a previously studied topology. The zero-field cooling (ZFC) of high-temperature superconductor (HTS) bulks promotes higher magnetic impulsion and levitation forces and lower electromagnetic losses than those with field-cooling (FC) but, on the other hand, the guiding stability is much lower than those with FC. Because of stability reasons, FC was adopted in most superconducting maglev systems. The trend of this research group has been to develop a horizontal axis HTS ZFC radial levitation PMB presenting notable levitation forces with reduced electromagnetic losses, defined by a topology that creates guiding stability. Previous work has shown that optimizing the bearing geometry to maximize magnetic guidance forces might not be enough to guarantee the axial stiffness required for many applications. First, the extent to which guidance forces are augmented by increasing the number of HTS bulks in the stator is evaluated. Then, the axial stiffness augmentation by passively adding two limiting permanent magnet (PM) rings is evaluated. The results show that the axial stiffness is highly augmented by adding limiting PM rings with no significant additional investment. This change enables the use of the studied ZFC superconducting PMB in high-precision axial stability applications, such as precision gyroscopes, horizontal axis propellers, and turbines.

show abstract

Axial Flux Machine Using Passive Magnetic Bearing with Axial Magnetization

Cited by 2 publications

References 19 publications

Axial Stiffness Augmentation by Adding HTS Bulks or Limiting PM Rings to a Horizontal Axis HTS ZFC Radial Passive Bearing

Axial Stiffness Augmentation by Adding HTS Bulks or Limiting PM Rings to a Horizontal Axis HTS ZFC Radial Passive Bearing

Axial Stiffness Augmentation by Adding Superconductor Bulks or Limiting Permanent Magnet Rings to a Horizontal Axis Zero-Field Cooled High-Tc Radial Passive Superconducting Bearing

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