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 <front>
  <journal-meta>
   <journal-id journal-id-type="publisher-id">Proceedings of Petersburg Transport University</journal-id>
   <journal-title-group>
    <journal-title xml:lang="en">Proceedings of Petersburg Transport University</journal-title>
    <trans-title-group xml:lang="ru">
     <trans-title>Известия Петербургского университета путей сообщения/Proceedings of Petersburg Transport University</trans-title>
    </trans-title-group>
   </journal-title-group>
   <issn publication-format="print">1815-588X</issn>
   <issn publication-format="online">2658-6851</issn>
  </journal-meta>
  <article-meta>
   <article-id pub-id-type="publisher-id">6ac04e3af4b844fa8a62f7b5</article-id>
   <article-id pub-id-type="doi">10.20295/1815-588X-2026-3-830-841</article-id>
   <article-categories>
    <subj-group subj-group-type="toc-heading" xml:lang="ru">
     <subject>СОВРЕМЕННЫЕ ТЕХНОЛОГИИ — ТРАНСПОРТУ</subject>
    </subj-group>
    <subj-group subj-group-type="toc-heading" xml:lang="en">
     <subject>СОВРЕМЕННЫЕ ТЕХНОЛОГИИ — ТРАНСПОРТУ</subject>
    </subj-group>
    <subj-group>
     <subject>СОВРЕМЕННЫЕ ТЕХНОЛОГИИ — ТРАНСПОРТУ</subject>
    </subj-group>
   </article-categories>
   <title-group>
    <article-title xml:lang="en">Mathematical Modeling of the Thermal Stability of Permanent Magnets under External Demagnetizing Fields for Traction Rolling Stock</article-title>
    <trans-title-group xml:lang="ru">
     <trans-title>Математическое моделирование термической устойчивости постоянных магнитов в условиях внешнего размагничивающего воздействия применительно к тяговому подвижному составу</trans-title>
    </trans-title-group>
   </title-group>
   <contrib-group content-type="authors">
    <contrib contrib-type="author">
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Жевак</surname>
       <given-names>Александра Сергеевна</given-names>
      </name>
      <name xml:lang="en">
       <surname>ZHevak</surname>
       <given-names>Aleksandra Sergeevna</given-names>
      </name>
     </name-alternatives>
     <email>a-b.zhevak@yandex.ru</email>
     <xref ref-type="aff" rid="aff-1"/>
    </contrib>
    <contrib contrib-type="author">
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Курилкин</surname>
       <given-names>Дмитрий Николаевич</given-names>
      </name>
      <name xml:lang="en">
       <surname>Kurilkin</surname>
       <given-names>Dmitry Nikolaevich</given-names>
      </name>
     </name-alternatives>
     <email>It@pgups.ru</email>
     <bio xml:lang="ru">
      <p>доктор технических наук;</p>
     </bio>
     <bio xml:lang="en">
      <p>doctor of technical sciences;</p>
     </bio>
     <xref ref-type="aff" rid="aff-2"/>
    </contrib>
   </contrib-group>
   <aff-alternatives id="aff-1">
    <aff>
     <institution xml:lang="ru">Ташкентский государственный транспортный университет</institution>
     <country country="RU" xml:lang="ru">RU</country>
    </aff>
    <aff>
     <institution xml:lang="en">Tashkent State Transport University, 1 Temiryulchilar</institution>
     <country country="RU" xml:lang="en">RU</country>
    </aff>
   </aff-alternatives>
   <aff-alternatives id="aff-2">
    <aff>
     <institution xml:lang="ru">Петербургский государственный университет путей сообщения Императора Александра I</institution>
     <city xml:lang="ru">Санкт-Петербург</city>
     <country country="RU" xml:lang="ru">Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">Emperor Alexander I Petersburg State Transport University</institution>
     <city xml:lang="en">St. Petersburg</city>
     <country country="RU" xml:lang="en">Russian Federation</country>
    </aff>
   </aff-alternatives>
   <pub-date publication-format="print" date-type="pub" iso-8601-date="2026-10-07T02:09:03+03:00">
    <day>07</day>
    <month>10</month>
    <year>2026</year>
   </pub-date>
   <pub-date publication-format="electronic" date-type="pub" iso-8601-date="2026-10-07T02:09:03+03:00">
    <day>07</day>
    <month>10</month>
    <year>2026</year>
   </pub-date>
   <volume>23</volume>
   <issue>3</issue>
   <fpage>830</fpage>
   <lpage>841</lpage>
   <history>
    <date date-type="received" iso-8601-date="2026-06-11T00:00:00+03:00">
     <day>11</day>
     <month>06</month>
     <year>2026</year>
    </date>
    <date date-type="accepted" iso-8601-date="2026-07-09T00:00:00+03:00">
     <day>09</day>
     <month>07</month>
     <year>2026</year>
    </date>
   </history>
   <permissions>
    <copyright-statement xml:lang="ru">© 2026 Жевак А.С., Курилкин Д.Н.</copyright-statement>
    <copyright-statement xml:lang="en">© 2026 ZHevak A.S., Kurilkin D.N.</copyright-statement>
    <copyright-year>2026</copyright-year>
    <copyright-holder xml:lang="ru">Жевак Александра Сергеевна, Курилкин Дмитрий Николаевич</copyright-holder>
    <copyright-holder xml:lang="en">ZHevak Aleksandra Sergeevna, Kurilkin Dmitry Nikolaevich</copyright-holder>
   </permissions>
   <self-uri xlink:href="https://itt-pgups.ru/en/nauka/publications/6ac04e3af4b844fa8a62f7b5/view">https://itt-pgups.ru/en/nauka/publications/6ac04e3af4b844fa8a62f7b5/view</self-uri>
   <abstract xml:lang="ru">
    <p>Цель: разработка метода оценки остаточного ресурса постоянных магнитов тяговых синхронных двигателей локомотивов на основе сплава Nd-Fe-B с учетом температурной зависимости магнит ных свойств. Методы: в качестве методологической основы в исследовании применяется термоди намический анализ температурной эволюции магнитных свойств с использованием аналитических моделей температурной характеристики остаточной магнитной индукции, учитывающих линейные и нелинейные зависимости. Результаты: на основании степенной зависимости магнитокристал лической анизотропии от температуры получена аналитическая модель снижения коэрцитивной силы магнитов на основе сплава Nd-Fe-B при нагреве. Введен безразмерный критерий термической устойчивости, который позволяет определять условие необратимого размагничивания через отно шение рабочего размагничивающего поля к температурно-зависимой коэрцитивной силе. Предло жен способ приведения режимов работы электродвигателя к эквивалентному размагничивающему воздействию через d-составляющую тока статора. Выполнен сравнительный анализ магнитов раз личных коммерческих классов. Показано, что увеличение энергетического класса не сопровожда ется ростом термической устойчивости. Введена интегральная мера накопления деградации при циклическом нагреве. Практическая значимость: результаты работы могут быть использованы для оценки термической деградации постоянных магнитов тяговых синхронных двигателей локо мотивов, а также для прогнозирования их остаточного ресурса в различных режимах эксплуатации с учетом накопленных повреждений.</p>
   </abstract>
   <trans-abstract xml:lang="en">
    <p>Objective: to develop a method for assessing the residual life of permanent magnets in traction synchronous motors of locomotives based on Nd–Fe–B alloys, taking into account the temperature dependence of magnetic properties. Methods: the study is based on a thermodynamic analysis of the temperature evolution of magnetic properties using analytical models of the temperature dependence of residual magnetic flux density, incorporating both linear and nonlinear relationships. Results: an analytical model describing the reduction of coercivity in Nd–Fe–B magnets under heating has been derived based on a power-law dependence of magnetocrystalline anisotropy on temperature. A dimensionless thermal stability criterion is introduced, enabling the determination of irreversible demagnetization conditions through the ratio of the operating demagnetizing field to the temperature-dependent coercivity. A method is proposed for converting motor operating conditions into an equivalent demagnetizing field via the d-axis component of the stator current. A comparative analysis of magnets of different commercial grades shows that an increase in energy product is not accompanied by improved thermal stability. An integral measure of degradation accumulation under cyclic heating is also introduced. Practical significance: the results can be used to assess thermal degradation of permanent magnets in traction synchronous motors of locomotives and to predict their residual life under various operating conditions, taking into account accumulated damage.</p>
   </trans-abstract>
   <kwd-group xml:lang="ru">
    <kwd>постоянные магниты</kwd>
    <kwd>nd-fe-b-магниты</kwd>
    <kwd>магнитокристаллическая анизотропия</kwd>
    <kwd>коэрцитивная сила</kwd>
    <kwd>термическая деградация</kwd>
    <kwd>критерий термической устойчивости</kwd>
    <kwd>синхронные двигатели с постоянными магнитами</kwd>
    <kwd>тяговый электродвигатель локомотива</kwd>
   </kwd-group>
   <kwd-group xml:lang="en">
    <kwd>permanent magnets</kwd>
    <kwd>nd-fe-b magnets</kwd>
    <kwd>magnetocrystalline anisotropy</kwd>
    <kwd>coercivity</kwd>
    <kwd>thermal degradation</kwd>
    <kwd>thermal stability criterion</kwd>
    <kwd>permanent magnet synchronous motors</kwd>
    <kwd>locomotive traction motor</kwd>
   </kwd-group>
  </article-meta>
 </front>
 <body>
  <p></p>
 </body>
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