Synchronous Reluctance Motors With an Axially Laminated Anisotropic Rotor as an Alternative in High-Speed Applications

Abramenko, Valerii; Petrov, Ilya; Nerg, Janne; Pyrhönen, Juha

doi:10.1109/access.2020.2971685

Cited by 27 publications

(28 citation statements)

References 27 publications

(32 reference statements)

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“…The simulation approach is discussed in the following. A 12 kW ALASynRM initially designed in [21] is used as the reference motor. The 12 kW ALASynRM was compared with IMs with smooth and slitted solid rotors in [21].…”

Section: Initial Datamentioning

confidence: 99%

“…A 12 kW ALASynRM initially designed in [21] is used as the reference motor. The 12 kW ALASynRM was compared with IMs with smooth and slitted solid rotors in [21]. To serve the reader, this section reports the main findings of [21] in brief.…”

Section: Initial Datamentioning

confidence: 99%

“…The 12 kW ALASynRM was compared with IMs with smooth and slitted solid rotors in [21]. To serve the reader, this section reports the main findings of [21] in brief. In addition, the viability of the selected materials is discussed.…”

Section: Initial Datamentioning

confidence: 99%

“…The objective of the present paper is to evaluate the impact of the ALA rotor design on the performance of an ALASynRM aimed at high-speed applications, also taking into consideration the aspects of temperature-treating manufacturing. Firstly, based on results obtained in [21], it is demonstrated that the initially designed ALASynRM has a higher electromagnetic performance compared with IMs with smooth and slitted solid rotors. Secondly, the HIP and vacuum brazing manufacturing technologies are applied to produce initial samples of the rotor structure.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Magnetic and Nonmagnetic Layers in an Axially Laminated Anisotropic Rotor of a High-Speed Synchronous Reluctance Motor Including Manufacturing Aspects

et al. 2020

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The impact of the thickness of the magnetic and nonmagnetic layers in an axially laminated anisotropic (ALA) rotor in a synchronous reluctance motor (SynRM) aimed at high-speed applications was studied. Considering possible manufacturing issues, the layers are desired to be thick rather than thin. At the same time, the layer thickness is related to the electromagnetic capabilities of the ALASynRM. In the study, a 12 kW ALASynRM was considered. As a reference, a 12 kW IM with a smooth solid rotor with copper end rings was used for comparison with the designed ALASynRM. The manufacturing procedures of an ALA rotor with certain materials were verified in practice. Strength tests of the samples were implemented showing the suitability of the selected materials for application in the prototype. In the electromagnetic design, the thickness of the ALA rotor layers has shown to have a significant impact on the rotor eddy current losses. The stator iron losses and the winding Joule losses also depend on the rotor design. Torque ripple is considerably affected by the thickness of the rotor layers and their position in relation to the stator slots.

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Section: Initial Datamentioning

confidence: 99%

Section: Initial Datamentioning

confidence: 99%

Section: Initial Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Magnetic and Nonmagnetic Layers in an Axially Laminated Anisotropic Rotor of a High-Speed Synchronous Reluctance Motor Including Manufacturing Aspects

et al. 2020

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“…In [13], the ALASynRM was designed taking into account not only the mechanical and electromagnetic characteristics of the magnetic and nonmagnetic materials but also their thermal expansion coefficients. The selected materials S355 and Inconel 718 have thermal expansion coefficients very close to each other but different yield strengths.…”

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confidence: 99%

Impact of the Current Vector Angle on the Performance of a Synchronous Reluctance Motor With an Axially Laminated Anisotropic Rotor

et al. 2021

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The impact of the current vector angle on the performance of a synchronous reluctance motor (SynRM) with an axially laminated anisotropic (ALA) rotor intended for high-speed applications is studied. The paper shows that the current vector angle not only impacts on the stator winding Joule losses and iron losses, but also strongly influences eddy current losses in the rotor (when the rated torque is produced). The rotor eddy current losses are determined by the flux density harmonics produced by the stator. The air gap flux is affected both by the magnitude and angle of the current vector. However, the rotor surface harmonics are not directly related to the overall flux level (which can be quite low at a high current angle) but depend more on the values of the individual slot current linkages. Considering the dependence of rotor losses on the current vector angle, the most efficient operating point is suggested to be close to 45 • or slightly larger, up to 65 • , where a compromise between increasing rotor eddy current losses and winding Joule losses and decreasing stator iron losses is found. The eddy current loss distribution between the layers of an ALA rotor is analyzed in detail. With a larger current vector angle, the eddy current losses increase most in the layers close to the d-axis. This is explained by the largest current linkage in the stator slots that are in front of the layers close to the d-axis. The dependence of torque ripple on the current vector angle is also observed. An analysis of rotor and stator high-order harmonics, which determine the torque ripple, is performed.

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Design of a high speed interior claw synchronous reluctance machine

Rouhani

Abdollahi

Gholamian

2021

Int Trans Electr Energ Syst

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Synchronous reluctance machine (SynRM) is one of the candidates of highspeed application drives. The rotor of this machine, as the most important and most challenging part of the design, has various tangential and radial ribs. Therefore, the quantity, thickness and length of the ribs are significant SynRM design parameters. If ribs' thickness is increased in order to enhance the mechanical robustness, its magnetic properties will be substantially deteriorated and vice versa. In this paper, by employing interior claws, a new rotor for SynRM is designed in a way that while increasing the mechanical robustness of the rotor for high speeds application, its magnetic characteristics enhanced, too. For this purpose, the proposed design method is applied on a two-flux barrier rotor of a 24 stator slot SynRM. The designed machine electromagnetic performance is evaluated by finite elements method (FEM) simulation and compared with other designs. Also, the mechanical strength of the proposed rotor with two alternative claws for the speeds up to 50krpm are evaluated and confirmed by structural FE analysis. At the end, the designed interior claw rotor is prototyped and tested. Prototyped SynRM magnetic characteristics that are extracted by experiment confirmed simulations results with acceptable accuracy. K E Y W O R D S flux barrier, flux carrier, interior claw, strain, yield stress List of Symbols and Abbreviations: k wq , Total width flux barrier to total flux carrier ratio; W bi , Width i-th flux barrier; C i , Width i-th flux carrier; N b , Number of flux barrier in the rotor per pole; N c , Number of flux carrier in the rotor per pole; P, Machine's pole pair number; I, Current (A); f qbi , Average mmf of each (i-th) flux barrier along with the q-axis; α 1 , Rotor slot pitch angle (mechanical); f q , q-axis component of the stator mmf (fundamental amplitude in per unit); n s , Machine's slot stator number; Δf qi , Differential average mmf over the each (i-th) barrier; D sh , Shaft diameter; α 2 , The end of final flux barrier angle (mechanical) to q-axis; N bi , i-th flux barrier; f dci , Average mmf of each (i-th) flux carrier along with the d-axis; f d , d-axis component of the stator mmf (fundamental amplitude in per unit); L d , d-axis inductance; L q , q-axis inductance; TR x , Thickness of tangential rib (mm); RR x , Thickness of radial rib (mm); T av , Average Torque (Nm); σ yield , Yield strength of core laminate; σ calc , Calculated maximum stress by FEM; W core , Width of core laminate; ΔT, Torque ripple; ω, Angular speed (mechanical); R so , Rotor slot opening (mm); F c , Centrifugal force over the each flux carrier; V, Velocity of rotor outer surface (m/s); m c , Mass of flux carrier; R c , Radius of center of gravity of flux carrier; S so , Stator slot opening (mm); D r , Rotor outer diameter; k, Factor of safety; n max , Maximum speed; n calc , Calculated speed by FEM; ξ, saliency ratio; SynRM, Synchronous Reluctance Machine; FEM, finite elements method; IM, induction machines; PMSM, permanent magnet synchr...

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Synchronous Reluctance Motors With an Axially Laminated Anisotropic Rotor as an Alternative in High-Speed Applications

Cited by 27 publications

References 27 publications

Influence of Magnetic and Nonmagnetic Layers in an Axially Laminated Anisotropic Rotor of a High-Speed Synchronous Reluctance Motor Including Manufacturing Aspects

Influence of Magnetic and Nonmagnetic Layers in an Axially Laminated Anisotropic Rotor of a High-Speed Synchronous Reluctance Motor Including Manufacturing Aspects

Impact of the Current Vector Angle on the Performance of a Synchronous Reluctance Motor With an Axially Laminated Anisotropic Rotor

Design of a high speed interior claw synchronous reluctance machine

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