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Influence of the closing rotor slots on the additional losses in the induction motor.

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Title: Influence of the closing rotor slots on the additional losses in the induction motor.
Authors: Dems, Maria1, Komeza, Krzysztof1 komeza@p.lodz.pl, Wiak, Slawomir2, Fernández Coya, Sara3, Wiak, Professor Slawomir
Source: COMPEL. 2015, Vol. 34 Issue 2, p531-549. 19p.
Subjects: Electric machinery rotors, Induction motors, Eddy current losses, Magnetic flux density, Magnetic field measurements, Electric power system harmonics, Finite element method
Abstract: Purpose - The purpose of this paper is to present the distribution of the magnetic field and additional losses analysis of the induction motors (IM) with opened and closed rotor slots. Design/methodology/approach - In the field-circuit approach the distribution and changes of magnetic flux density in the motor are computed using a time-stepping finite element method. The additional losses in each element are evaluated at different frequencies. Findings - An approximate analytical formulation is derived for rapid losses computation confirmed by the results of field-circuit method. For high-voltage motors due to the size ratios of the core and relatively deep stator and rotor slots major role in causing loss of higher harmonics play a fundamental slot harmonics. Higher harmonics order bigger than 100 cause only small part of total higher harmonics core losses. Closed rotor slots construction influenced significantly on no-load losses mainly due to reduction of losses at slot upper part. For nominal load condition that influence is not so strong according to the saturation of slot tips by rotor leakage flux. Nevertheless, core losses at load are several times higher as at no-load. Research limitations/implications - In future research authors will take into account motors feed from PWM inverter, working in the frequency range up to 400 Hz. Practical implications - The results of investigation will be used in more detailed design of IMs especially for motors with closed rotor slots. Originality/value - The methods presented in the paper was not used before. Also results of additional losses in the motor core calculation, especially according motors with closed slots at no load and load conditions are new. [ABSTRACT FROM AUTHOR]
Copyright of COMPEL is the property of Emerald Publishing Limited and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
FullText Text:
  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 102140341
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Influence of the closing rotor slots on the additional losses in the induction motor.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Dems%2C+Maria%22">Dems, Maria</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Komeza%2C+Krzysztof%22">Komeza, Krzysztof</searchLink><relatesTo>1</relatesTo><i> komeza@p.lodz.pl</i><br /><searchLink fieldCode="AR" term="%22Wiak%2C+Slawomir%22">Wiak, Slawomir</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Fernández+Coya%2C+Sara%22">Fernández Coya, Sara</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Wiak%2C+Professor+Slawomir%22">Wiak, Professor Slawomir</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22COMPEL%22">COMPEL</searchLink>. 2015, Vol. 34 Issue 2, p531-549. 19p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Electric+machinery+rotors%22">Electric machinery rotors</searchLink><br /><searchLink fieldCode="DE" term="%22Induction+motors%22">Induction motors</searchLink><br /><searchLink fieldCode="DE" term="%22Eddy+current+losses%22">Eddy current losses</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+flux+density%22">Magnetic flux density</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+field+measurements%22">Magnetic field measurements</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+power+system+harmonics%22">Electric power system harmonics</searchLink><br /><searchLink fieldCode="DE" term="%22Finite+element+method%22">Finite element method</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Purpose - The purpose of this paper is to present the distribution of the magnetic field and additional losses analysis of the induction motors (IM) with opened and closed rotor slots. Design/methodology/approach - In the field-circuit approach the distribution and changes of magnetic flux density in the motor are computed using a time-stepping finite element method. The additional losses in each element are evaluated at different frequencies. Findings - An approximate analytical formulation is derived for rapid losses computation confirmed by the results of field-circuit method. For high-voltage motors due to the size ratios of the core and relatively deep stator and rotor slots major role in causing loss of higher harmonics play a fundamental slot harmonics. Higher harmonics order bigger than 100 cause only small part of total higher harmonics core losses. Closed rotor slots construction influenced significantly on no-load losses mainly due to reduction of losses at slot upper part. For nominal load condition that influence is not so strong according to the saturation of slot tips by rotor leakage flux. Nevertheless, core losses at load are several times higher as at no-load. Research limitations/implications - In future research authors will take into account motors feed from PWM inverter, working in the frequency range up to 400 Hz. Practical implications - The results of investigation will be used in more detailed design of IMs especially for motors with closed rotor slots. Originality/value - The methods presented in the paper was not used before. Also results of additional losses in the motor core calculation, especially according motors with closed slots at no load and load conditions are new. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of COMPEL is the property of Emerald Publishing Limited and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1108/COMPEL-07-2014-0183
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 19
        StartPage: 531
    Subjects:
      – SubjectFull: Electric machinery rotors
        Type: general
      – SubjectFull: Induction motors
        Type: general
      – SubjectFull: Eddy current losses
        Type: general
      – SubjectFull: Magnetic flux density
        Type: general
      – SubjectFull: Magnetic field measurements
        Type: general
      – SubjectFull: Electric power system harmonics
        Type: general
      – SubjectFull: Finite element method
        Type: general
    Titles:
      – TitleFull: Influence of the closing rotor slots on the additional losses in the induction motor.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Dems, Maria
      – PersonEntity:
          Name:
            NameFull: Komeza, Krzysztof
      – PersonEntity:
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            NameFull: Wiak, Slawomir
      – PersonEntity:
          Name:
            NameFull: Fernández Coya, Sara
      – PersonEntity:
          Name:
            NameFull: Wiak, Professor Slawomir
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          Dates:
            – D: 01
              M: 03
              Text: 2015
              Type: published
              Y: 2015
          Identifiers:
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              Value: 03321649
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            – Type: volume
              Value: 34
            – Type: issue
              Value: 2
          Titles:
            – TitleFull: COMPEL
              Type: main
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