Asymmetrical Geometries in Electrical Machines

Ilya Petrov (Corresponding Author), Pavel Ponomarev, Juha Pyrhönen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

This paper describes and classifies possibilities of using asymmetric geometry solutions in slotted electrical machines with nonlinear soft magnetic core. These asymmetrical optimizations can reduce cogging torque and torque ripple at the nominal load. Additionally, some of them can improve overload capability, and field weakening capability by proper optimization of over-saturated regions of soft magnetic core. In this paper it is shown that the geometry of the soft magnetic core regions of TC-PMSMs, exhibiting strong saturation due to the interaction of PM- and armature reaction fluxes, has a significant impact on the torque quality. Therefore, by their modifications (including asymmetrical) it is possible to improve the machine characteristics. Two types of PMSM rotor arrangements (embedded-magnet rotor PMSM and rotor-surface magnet PMSM) were simulated with 2D FEM. The results showed that slight modification of the TC-PMSMs soft magnetic regions near by the air gap which exhibit the strongest saturation can lead to significant torque quality variation as well as to synchronous inductance changes.
Original languageEnglish
Pages (from-to)20-27
JournalInternational Review of Electrical Engineering
Volume11
Issue number1
DOIs
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

Fingerprint

Magnetic cores
Torque
Geometry
Rotors
Magnets
Inductance
Loads (forces)
Fluxes
Finite element method
Air

Keywords

  • fractional slot PMSM
  • permanent magnet machines
  • TC-PMSM
  • tooth-coil winding
  • torque ripple

Cite this

Petrov, Ilya ; Ponomarev, Pavel ; Pyrhönen, Juha. / Asymmetrical Geometries in Electrical Machines. In: International Review of Electrical Engineering. 2016 ; Vol. 11, No. 1. pp. 20-27.
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abstract = "This paper describes and classifies possibilities of using asymmetric geometry solutions in slotted electrical machines with nonlinear soft magnetic core. These asymmetrical optimizations can reduce cogging torque and torque ripple at the nominal load. Additionally, some of them can improve overload capability, and field weakening capability by proper optimization of over-saturated regions of soft magnetic core. In this paper it is shown that the geometry of the soft magnetic core regions of TC-PMSMs, exhibiting strong saturation due to the interaction of PM- and armature reaction fluxes, has a significant impact on the torque quality. Therefore, by their modifications (including asymmetrical) it is possible to improve the machine characteristics. Two types of PMSM rotor arrangements (embedded-magnet rotor PMSM and rotor-surface magnet PMSM) were simulated with 2D FEM. The results showed that slight modification of the TC-PMSMs soft magnetic regions near by the air gap which exhibit the strongest saturation can lead to significant torque quality variation as well as to synchronous inductance changes.",
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Asymmetrical Geometries in Electrical Machines. / Petrov, Ilya (Corresponding Author); Ponomarev, Pavel; Pyrhönen, Juha.

In: International Review of Electrical Engineering, Vol. 11, No. 1, 2016, p. 20-27.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Asymmetrical Geometries in Electrical Machines

AU - Petrov, Ilya

AU - Ponomarev, Pavel

AU - Pyrhönen, Juha

PY - 2016

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N2 - This paper describes and classifies possibilities of using asymmetric geometry solutions in slotted electrical machines with nonlinear soft magnetic core. These asymmetrical optimizations can reduce cogging torque and torque ripple at the nominal load. Additionally, some of them can improve overload capability, and field weakening capability by proper optimization of over-saturated regions of soft magnetic core. In this paper it is shown that the geometry of the soft magnetic core regions of TC-PMSMs, exhibiting strong saturation due to the interaction of PM- and armature reaction fluxes, has a significant impact on the torque quality. Therefore, by their modifications (including asymmetrical) it is possible to improve the machine characteristics. Two types of PMSM rotor arrangements (embedded-magnet rotor PMSM and rotor-surface magnet PMSM) were simulated with 2D FEM. The results showed that slight modification of the TC-PMSMs soft magnetic regions near by the air gap which exhibit the strongest saturation can lead to significant torque quality variation as well as to synchronous inductance changes.

AB - This paper describes and classifies possibilities of using asymmetric geometry solutions in slotted electrical machines with nonlinear soft magnetic core. These asymmetrical optimizations can reduce cogging torque and torque ripple at the nominal load. Additionally, some of them can improve overload capability, and field weakening capability by proper optimization of over-saturated regions of soft magnetic core. In this paper it is shown that the geometry of the soft magnetic core regions of TC-PMSMs, exhibiting strong saturation due to the interaction of PM- and armature reaction fluxes, has a significant impact on the torque quality. Therefore, by their modifications (including asymmetrical) it is possible to improve the machine characteristics. Two types of PMSM rotor arrangements (embedded-magnet rotor PMSM and rotor-surface magnet PMSM) were simulated with 2D FEM. The results showed that slight modification of the TC-PMSMs soft magnetic regions near by the air gap which exhibit the strongest saturation can lead to significant torque quality variation as well as to synchronous inductance changes.

KW - fractional slot PMSM

KW - permanent magnet machines

KW - TC-PMSM

KW - tooth-coil winding

KW - torque ripple

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JO - International Review of Electrical Engineering

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SN - 1827-6660

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