The Effect of Slit Skew Angle on the Performance of Axially-Slitted Solid Rotor Induction Motors

Batı Eren Ergun; Egemen Semerci; Mahmut Abacı; Mehmet Onur Gulbahce

doi:10.1109/RTUCON67996.2025.11414916

The Effect of Slit Skew Angle on the Performance of Axially-Slitted Solid Rotor Induction Motors

Batı Eren Ergun^*
, Egemen Semerci
, Mahmut Abacı
, Mehmet Onur Gulbahce

^*Corresponding author for this work

Department of Electrical Engineering

Istanbul Technical University

Research output: Contribution to journal › Conference article › peer-review

Abstract

Axial slits in solid rotor induction motors (SRIMs) enhance torque production, yet the impact of skewing these slits remains insufficiently explored. This paper presents a finite element analysis (FEA) of an Axially-Slitted SRIM (AS-SRIM) with skew angles from 0° to 60°, evaluated under constant-speed operation. Key performance metrics—including torque, torque-to-current ratio, efficiency, and input current—were assessed alongside the air-gap flux density spectrum, overall flux distribution, and flux-line trajectories. The results indicate that an optimum skew angle not only mitigates space harmonics in the air-gap flux but also improves efficiency and torque-to-current performance. In this study, a 4 kW, 400 V/400 Hz AS-SRIM was analyzed, and the findings provide practical insights for skew angle selection in high-performance solid rotor induction machines.

Original language	English
Journal	International Scientific Conference on Power and Electrical Engineering of Riga Technical University, RTUCON
Issue number	2025
DOIs	https://doi.org/10.1109/RTUCON67996.2025.11414916
Publication status	Published - 2025
Event	66th International Scientific Conference on Power and Electrical Engineering of Riga Technical University, RTUCON 2025 - Riga, Latvia Duration: 23 Oct 2025 → 25 Oct 2025

Bibliographical note

Publisher Copyright:
©2025 IEEE.

Keywords

air gaps
finite element analysis
harmonic analysis
induction motors
magnetic flux density
solid rotor

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10.1109/RTUCON67996.2025.11414916

Cite this

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title = "The Effect of Slit Skew Angle on the Performance of Axially-Slitted Solid Rotor Induction Motors",

abstract = "Axial slits in solid rotor induction motors (SRIMs) enhance torque production, yet the impact of skewing these slits remains insufficiently explored. This paper presents a finite element analysis (FEA) of an Axially-Slitted SRIM (AS-SRIM) with skew angles from 0° to 60°, evaluated under constant-speed operation. Key performance metrics—including torque, torque-to-current ratio, efficiency, and input current—were assessed alongside the air-gap flux density spectrum, overall flux distribution, and flux-line trajectories. The results indicate that an optimum skew angle not only mitigates space harmonics in the air-gap flux but also improves efficiency and torque-to-current performance. In this study, a 4 kW, 400 V/400 Hz AS-SRIM was analyzed, and the findings provide practical insights for skew angle selection in high-performance solid rotor induction machines.",

keywords = "air gaps, finite element analysis, harmonic analysis, induction motors, magnetic flux density, solid rotor",

author = "Ergun, \{Batı Eren\} and Egemen Semerci and Mahmut Abacı and Gulbahce, \{Mehmet Onur\}",

note = "Publisher Copyright: {\textcopyright}2025 IEEE.; 66th International Scientific Conference on Power and Electrical Engineering of Riga Technical University, RTUCON 2025 ; Conference date: 23-10-2025 Through 25-10-2025",

year = "2025",

doi = "10.1109/RTUCON67996.2025.11414916",

language = "English",

journal = "International Scientific Conference on Power and Electrical Engineering of Riga Technical University, RTUCON",

issn = "2768-3338",

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TY - JOUR

T1 - The Effect of Slit Skew Angle on the Performance of Axially-Slitted Solid Rotor Induction Motors

AU - Ergun, Batı Eren

AU - Semerci, Egemen

AU - Abacı, Mahmut

AU - Gulbahce, Mehmet Onur

PY - 2025

Y1 - 2025

N2 - Axial slits in solid rotor induction motors (SRIMs) enhance torque production, yet the impact of skewing these slits remains insufficiently explored. This paper presents a finite element analysis (FEA) of an Axially-Slitted SRIM (AS-SRIM) with skew angles from 0° to 60°, evaluated under constant-speed operation. Key performance metrics—including torque, torque-to-current ratio, efficiency, and input current—were assessed alongside the air-gap flux density spectrum, overall flux distribution, and flux-line trajectories. The results indicate that an optimum skew angle not only mitigates space harmonics in the air-gap flux but also improves efficiency and torque-to-current performance. In this study, a 4 kW, 400 V/400 Hz AS-SRIM was analyzed, and the findings provide practical insights for skew angle selection in high-performance solid rotor induction machines.

AB - Axial slits in solid rotor induction motors (SRIMs) enhance torque production, yet the impact of skewing these slits remains insufficiently explored. This paper presents a finite element analysis (FEA) of an Axially-Slitted SRIM (AS-SRIM) with skew angles from 0° to 60°, evaluated under constant-speed operation. Key performance metrics—including torque, torque-to-current ratio, efficiency, and input current—were assessed alongside the air-gap flux density spectrum, overall flux distribution, and flux-line trajectories. The results indicate that an optimum skew angle not only mitigates space harmonics in the air-gap flux but also improves efficiency and torque-to-current performance. In this study, a 4 kW, 400 V/400 Hz AS-SRIM was analyzed, and the findings provide practical insights for skew angle selection in high-performance solid rotor induction machines.

KW - air gaps

KW - finite element analysis

KW - harmonic analysis

KW - induction motors

KW - magnetic flux density

KW - solid rotor

UR - https://www.scopus.com/pages/publications/105037436299

U2 - 10.1109/RTUCON67996.2025.11414916

DO - 10.1109/RTUCON67996.2025.11414916

M3 - Conference article

AN - SCOPUS:105037436299

SN - 2768-3338

JO - International Scientific Conference on Power and Electrical Engineering of Riga Technical University, RTUCON

JF - International Scientific Conference on Power and Electrical Engineering of Riga Technical University, RTUCON

IS - 2025

T2 - 66th International Scientific Conference on Power and Electrical Engineering of Riga Technical University, RTUCON 2025

Y2 - 23 October 2025 through 25 October 2025

ER -

The Effect of Slit Skew Angle on the Performance of Axially-Slitted Solid Rotor Induction Motors

Abstract

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Keywords

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